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Standard Model EFT and Extended Scalar Sectors
Sally Dawson, Christopher W. Murphy
Apr 27 2017 hep-ph arXiv:1704.07851v1

@misc{1704.07851, author = {Sally Dawson and Christopher W.~Murphy}, title = {{S}tandard {M}odel {EFT} and {E}xtended {S}calar {S}ectors}, year = {2017}, eprint = {1704.07851}, note = {arXiv:1704.07851v1} }
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One of the simplest extensions of the Standard Model is the inclusion of an additional scalar multiplet, and we consider scalars in the $SU(2)_L$ singlet, triplet, and quartet representations. We examine models with heavy neutral scalars, $m_H\sim 1-2$ TeV, and the matching of the UV complete theories to the low energy effective field theory. We demonstrate the agreement of the kinematic distributions obtained in the singlet models for the gluon fusion of a Higgs pair with the predictions of the effective field theory. The restrictions on the extended scalar sectors due to unitarity and precision electroweak measurements are summarized and lead to highly restricted regions of viable parameter space for the triplet and quartet models.
Vector-like Fermions and Higgs Effective Field Theory Revisited
Chien-Yi Chen, S. Dawson, Elisabetta Furlan
Mar 20 2017 hep-ph arXiv:1703.06134v2

@misc{1703.06134, author = {Chien-Yi Chen and S.~Dawson and Elisabetta Furlan}, title = {{V}ector-like {F}ermions and {H}iggs {E}ffective {F}ield {T}heory {R}evisited}, year = {2017}, eprint = {1703.06134}, note = {arXiv:1703.06134v2} }
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Heavy vector-like quarks (VLQs) appear in many models of beyond the Standard Model physics. Direct experimental searches require these new quarks to be heavy, $\gsim$ 800-1000 GeV. We perform a global fit of the parameters of simple VLQ models in minimal representations of $SU(2)_L$ to precision data and Higgs rates. An interesting connection between anomalous $Z b {\overline {b}}$ interactions and Higgs physics in VLQ models is discussed. Finally, we present our analysis in an effective field theory (EFT) framework and show that the parameters of VLQ models are already highly constrained. Exact and approximate analytical formulas for the $S$ and $T$ parameters in the VLQ models we consider are posted at https://quark.phy.bnl.gov/Digital_Data_Archive/dawson/vlq_17/ as Mathematica files.
Handbook of LHC Higgs Cross Sections: 4. Deciphering the Nature of the Higgs Sector
D. de Florian, C. Grojean, F. Maltoni, C. Mariotti, A. Nikitenko, M. Pieri, P. Savard, M. Schumacher, R. Tanaka, R. Aggleton, M. Ahmad, B. Allanach, C. Anastasiou, W. Astill, S. Badger, M. Badziak, J. Baglio, E. Bagnaschi, A. Ballestrero, A. Banfi, et al (356)
Oct 26 2016 hep-ph hep-ex arXiv:1610.07922v2

@misc{1610.07922, author = {D.~de Florian and C.~Grojean and F.~Maltoni and C.~Mariotti and A.~Nikitenko and M.~Pieri and P.~Savard and M.~Schumacher and R.~Tanaka and R.~Aggleton and M.~Ahmad and B.~Allanach and C.~Anastasiou and W.~Astill and S.~Badger and M.~Badziak and J.~Baglio and E.~Bagnaschi and A.~Ballestrero and A.~Banfi and D.~Barducci and M.~Beckingham and C.~Becot and G.~Bélanger and J.~Bellm and N.~Belyaev and F.U.~Bernlochner and C.~Beskidt and A.~Biekötter and F.~Bishara and W.~Bizon and N.E.~Bomark and M.~Bonvini and S.~Borowka and V.~Bortolotto and S.~Boselli and F.J.~Botella and R.~Boughezal and G.C.~Branco and J.~Brehmer and L.~Brenner and S.~Bressler and I.~Brivio and A.~Broggio and H.~Brun and G.~Buchalla and C.D.~Burgard and A.~Calandri and L.~Caminada and R.~Caminal Armadans and F.~Campanario and J.~Campbell and F.~Caola and C.M.~Carloni Calame and S.~Carrazza and A.~Carvalho and M.~Casolino and O.~Cata and A.~Celis and F.~Cerutti and N.~Chanon and M.~Chen and X.~Chen and B.~Chokoufé Nejad and N.~Christensen and M.~Ciuchini and R.~Contino and T.~Corbett and R.~Costa and D.~Curtin and M.~Dall'Osso and A.~David and S.~Dawson and J.~de Blas and W.~de Boer and P.~de Castro Manzano and C.~Degrande and R.L.~Delgado and F.~Demartin and A.~Denner and B.~Di Micco and R.~Di Nardo and S.~Dittmaier and A.~Dobado and T.~Dorigo and F.A.~Dreyer and M.~Dührssen and C.~Duhr and F.~Dulat and K.~Ecker and K.~Ellis and U.~Ellwanger and C.~Englert and D.~Espriu and A.~Falkowski and L.~Fayard and R.~Feger and G.~Ferrera and A.~Ferroglia and N.~Fidanza and T.~Figy and M.~Flechl and D.~Fontes and S.~Forte and P.~Francavilla and E.~Franco and R.~Frederix and A.~Freitas and F.F.~Freitas and F.~Frensch and S.~Frixione and B.~Fuks and E.~Furlan and S.~Gadatsch and J.~Gao and Y.~Gao and M.V.~Garzelli and T.~Gehrmann and R.~Gerosa and M.~Ghezzi and D.~Ghosh and S.~Gieseke and D.~Gillberg and G.F.~Giudice and E.W.N.~Glover and F.~Goertz and D.~Gonçalves and J.~Gonzalez-Fraile and M.~Gorbahn and S.~Gori and C.A.~Gottardo and M.~Gouzevitch and P.~Govoni and D.~Gray and M.~Grazzini and N.~Greiner and A.~Greljo and J.~Grigo and A.V.~Gritsan and R.~Gröber and S.~Guindon and H.E.~Haber and C.~Han and T.~Han and R.~Harlander and M.A.~Harrendorf and H.B.~Hartanto and C.~Hays and S.~Heinemeyer and G.~Heinrich and M.~Herrero and F.~Herzog and B.~Hespel and V.~Hirschi and S.~Hoeche and S.~Honeywell and S.J.~Huber and C.~Hugonie and J.~Huston and A.~Ilnicka and G.~Isidori and B.~Jäger and M.~Jaquier and S.P.~Jones and A.~Juste and S.~Kallweit and A.~Kaluza and A.~Kardos and A.~Karlberg and Z.~Kassabov and N.~Kauer and D.I.~Kazakov and M.~Kerner and W.~Kilian and F.~Kling and K.~Köneke and R.~Kogler and R.~Konoplich and S.~Kortner and S.~Kraml and C.~Krause and F.~Krauss and M.~Krawczyk and A.~Kulesza and S.~Kuttimalai and R.~Lane and A.~Lazopoulos and G.~Lee and P.~Lenzi and I.M.~Lewis and Y.~Li and S.~Liebler and J.~Lindert and X.~Liu and Z.~Liu and F.J.~Llanes-Estrada and H.E.~Logan and D.~Lopez-Val and I.~Low and G.~Luisoni and P.~Maierhöfer and E.~Maina and B.~Mansoulié and H.~Mantler and M.~Mantoani and A.C.~Marini and V.I.~Martinez Outschoorn and S.~Marzani and D.~Marzocca and A.~Massironi and K.~Mawatari and J.~Mazzitelli and A.~McCarn and B.~Mellado and K.~Melnikov and S.B.~Menari and L.~Merlo and C.~Meyer and P.~Milenovic and K.~Mimasu and S.~Mishima and B.~Mistlberger and S.-O.~Moch and A.~Mohammadi and P.F.~Monni and G.~Montagna and M.~Moreno Llácer and N.~Moretti and S.~Moretti and L.~Motyka and A.~Mück and M.~Mühlleitner and S.~Munir and P.~Musella and P.~Nadolsky and D.~Napoletano and M.~Nebot and C.~Neu and M.~Neubert and R.~Nevzorov and O.~Nicrosini and J.~Nielsen and K.~Nikolopoulos and J.M.~No and C.~O'Brien and T.~Ohl and C.~Oleari and T.~Orimoto and D.~Pagani and C.E.~Pandini and A.~Papaefstathiou and A.S.~Papanastasiou and G.~Passarino and B.D.~Pecjak and M.~Pelliccioni and G.~Perez and L.~Perrozzi and F.~Petriello and G.~Petrucciani and E.~Pianori and F.~Piccinini and M.~Pierini and A.~Pilkington and S.~Plätzer and T.~Plehn and R.~Podskubka and C.T.~Potter and S.~Pozzorini and K.~Prokofiev and A.~Pukhov and I.~Puljak and M.~Queitsch-Maitland and J.~Quevillon and D.~Rathlev and M.~Rauch and E.~Re and M.N.~Rebelo and D.~Rebuzzi and L.~Reina and C.~Reuschle and J.~Reuter and M.~Riembau and F.~Riva and A.~Rizzi and T.~Robens and R.~Röntsch and J.~Rojo and J.C.~Romão and N.~Rompotis and J.~Roskes and R.~Roth and G.P.~Salam and R.~Salerno and M.O.P.~Sampaio and R.~Santos and V.~Sanz and J.J.~Sanz-Cillero and H.~Sargsyan and U.~Sarica and P.~Schichtel and J.~Schlenk and T.~Schmidt and C.~Schmitt and M.~Schönherr and U.~Schubert and M.~Schulze and S.~Sekula and M.~Sekulla and E.~Shabalina and H.S.~Shao and J.~Shelton and C.H.~Shepherd-Themistocleous and S.Y.~Shim and F.~Siegert and A.~Signer and J.P.~Silva and L.~Silvestrini and M.~Sjodahl and P.~Slavich and M.~Slawinska and L.~Soffi and M.~Spannowsky and C.~Speckner and D.M.~Sperka and M.~Spira and O.~Stål and F.~Staub and T.~Stebel and T.~Stefaniak and M.~Steinhauser and I.W.~Stewart and M.J.~Strassler and J.~Streicher and D.M.~Strom and S.~Su and X.~Sun and F.J.~Tackmann and K.~Tackmann and A.M.~Teixeira and R.~Teixeira de Lima and V.~Theeuwes and R.~Thorne and D.~Tommasini and P.~Torrielli and M.~Tosi and F.~Tramontano and Z.~Trócsányi and M.~Trott and I.~Tsinikos and M.~Ubiali and P.~Vanlaer and W.~Verkerke and A.~Vicini and L.~Viliani and E.~Vryonidou and D.~Wackeroth and C.E.M.~Wagner and J.~Wang and S.~Wayand and G.~Weiglein and C.~Weiss and M.~Wiesemann and C.~Williams and J.~Winter and D.~Winterbottom and R.~Wolf and M.~Xiao and L.L.~Yang and R.~Yohay and S.P.Y.~Yuen and G.~Zanderighi and M.~Zaro and D.~Zeppenfeld and R.~Ziegler and T.~Zirke and J.~Zupan}, title = {{H}andbook of {LHC} {H}iggs {C}ross {S}ections: 4. {D}eciphering the {N}ature of the {H}iggs {S}ector}, year = {2016}, eprint = {1610.07922}, doi = {10.23731/CYRM-2017-002}, note = {arXiv:1610.07922v2} }
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This Report summarizes the results of the activities of the LHC Higgs Cross Section Working Group in the period 2014-2016. The main goal of the working group was to present the state-of-the-art of Higgs physics at the LHC, integrating all new results that have appeared in the last few years. The first part compiles the most up-to-date predictions of Higgs boson production cross sections and decay branching ratios, parton distribution functions, and off-shell Higgs boson production and interference effects. The second part discusses the recent progress in Higgs effective field theory predictions, followed by the third part on pseudo-observables, simplified template cross section and fiducial cross section measurements, which give the baseline framework for Higgs boson property measurements. The fourth part deals with the beyond the Standard Model predictions of various benchmark scenarios of Minimal Supersymmetric Standard Model, extended scalar sector, Next-to-Minimal Supersymmetric Standard Model and exotic Higgs boson decays. This report follows three previous working-group reports: Handbook of LHC Higgs Cross Sections: 1. Inclusive Observables (CERN-2011-002), Handbook of LHC Higgs Cross Sections: 2. Differential Distributions (CERN-2012-002), and Handbook of LHC Higgs Cross Sections: 3. Higgs properties (CERN-2013-004). The current report serves as the baseline reference for Higgs physics in LHC Run 2 and beyond.
Resummation of Jet Veto Logarithms at partial N$^3$LL + NNLO for $W^+W^-$ Production at the LHC
S. Dawson, P. Jaiswal, Ye Li, H. Ramani, Mao Zeng
Jun 06 2016 hep-ph arXiv:1606.01034v3

@misc{1606.01034, author = {S.~Dawson and P.~Jaiswal and Ye Li and H.~Ramani and Mao Zeng}, title = {{R}esummation of {J}et {V}eto {L}ogarithms at partial {N}$^3${LL} + {NNLO} for ${W}^+{W}^-$ {P}roduction at the {LHC}}, year = {2016}, eprint = {1606.01034}, note = {arXiv:1606.01034v3} }
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We compute the resummed on-shell $W^+ W^-$ production cross section under a jet-veto at the LHC to partial N$^3$LL order matched to the fixed order NNLO result. Differential NNLO cross sections are obtained from an implementation of $q_T$ subtraction in Sherpa. The two-loop virtual corrections to the $q \bar q \rightarrow W^+ W^-$ amplitude, used in both fixed order and resummation predictions, are extracted from the public code \tt qqvvamp. We perform resummation using soft collinear effective theory (SCET), with approximate beam functions where only the logarithmic terms are included at two-loop. In addition to scale uncertainties from the hard matching scale and the factorization scale, rapidity scale variations are obtained within the analytic regulator approach. Our resummation results show a decrease in the jet-veto cross-section compared to NNLO fixed order predictions, with reduced scale uncertainties compared to NNLL+NLO resummed predictions. We include the loop-induced $gg$ contribution with jet veto resummation to NLL+LO. The prediction shows good agreement with recent LHC measurements.
Singlet Model Interference Effects with High Scale UV Physics
S. Dawson, I. M. Lewis
May 18 2016 hep-ph arXiv:1605.04944v2

@misc{1605.04944, author = {S.~Dawson and I.~M.~Lewis}, title = {{S}inglet {M}odel {I}nterference {E}ffects with {H}igh {S}cale {UV} {P}hysics}, year = {2016}, eprint = {1605.04944}, note = {arXiv:1605.04944v2} }
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One of the simplest extensions of the Standard Model (SM) is the addition of a scalar gauge singlet, S. If S is not forbidden by a symmetry from mixing with the Standard Model Higgs boson, the mixing will generate non-SM rates for Higgs production and decays. In general, there could also be unknown high energy physics that generates additional effective low energy interactions. We show that interference effects between the scalar resonance of the singlet model and the effective field theory (EFT) operators can have significant effects in the Higgs sector. We examine a non-$Z_2$ symmetric scalar singlet model and demonstrate that a fit to the 125 GeV Higgs boson couplings and to limits on high mass resonances, S, exhibit an interesting structure and possible large cancellations of effects between the resonance contribution and the new EFT interactions, that invalidate conclusions based on the renormalizable singlet model alone.
Progress in Electroweak Symmetry Breaking
S. Dawson
Nov 13 2015 hep-ph arXiv:1511.04040v1

@misc{1511.04040, author = {S.~Dawson}, title = {{P}rogress in {E}lectroweak {S}ymmetry {B}reaking}, year = {2015}, eprint = {1511.04040}, note = {arXiv:1511.04040v1} }
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In this talk, I discuss theoretical advances in understanding the properties of the Higgs boson and the implications for models of electroweak symmetry breaking. I begin by reviewing some of the recent progress in Standard Model calculations for Higgs boson production and decay rates, followed by a lightning tour of the use of effective field theories in the search for new physics in the Higgs sector. I end with a discussion of the complementarity of precision Higgs coupling measurements and direct searches for heavy particles for the discovery of Beyond the Standard Model physics in the electroweak sector.
NLO Corrections to Double Higgs Production in the Higgs Singlet Model
S. Dawson, I. M. Lewis
Aug 25 2015 hep-ph arXiv:1508.05397v2

@misc{1508.05397, author = {S.~Dawson and I.~M.~Lewis}, title = {{NLO} {C}orrections to {D}ouble {H}iggs {P}roduction in the {H}iggs {S}inglet {M}odel}, year = {2015}, eprint = {1508.05397}, note = {arXiv:1508.05397v2} }
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Higgs pair production at the LHC from gluon fusion is small in the Standard Model, but can be enhanced in models where a resonant enhancement is allowed. We examine the effect of a resonant contribution from a second scalar arising in a model with a gauge singlet scalar field in addition to the usual SU(2) scalar doublet, with mass up to $M_H$~600 GeV and discuss the interference effects in double Higgs production. We compute the NLO QCD corrections in the large $m_t$ limit and show that they can significantly distort kinematic distributions near the resonance peak.
Higgs CP Violation from Vectorlike Quarks
Chien-Yi Chen, S. Dawson, Yue Zhang
Jul 28 2015 hep-ph arXiv:1507.07020v1

@misc{1507.07020, author = {Chien-Yi Chen and S.~Dawson and Yue Zhang}, title = {{H}iggs {CP} {V}iolation from {V}ectorlike {Q}uarks}, year = {2015}, eprint = {1507.07020}, note = {arXiv:1507.07020v1} }
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We explore CP violating aspects in the Higgs sector of models where new vectorlike quarks carry Yukawa couplings mainly to the third generation quarks of the Standard Model. We point out that in the simplest model, Higgs CP violating interactions only exist in the hWW channel. At low energy, we find that rare B decays can place similarly strong constraints as those from electric dipole moments on the source of CP violation. These observations offer a new handle to discriminate from other Higgs CP violating scenarios such as scalar sector extensions of the Standard Model, and imply an interesting future interplay among limits from different experiments.
What's in the Loop? The Anatomy of Double Higgs Production
S. Dawson, A. Ismail, Ian Low
Apr 23 2015 hep-ph arXiv:1504.05596v2

@misc{1504.05596, author = {S.~Dawson and A.~Ismail and Ian Low}, title = {{W}hat's in the {L}oop? {T}he {A}natomy of {D}ouble {H}iggs {P}roduction}, year = {2015}, eprint = {1504.05596}, howpublished = {Phys. Rev. D 91, 115008 (2015)}, doi = {10.1103/PhysRevD.91.115008}, note = {arXiv:1504.05596v2} }
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Determination of Higgs self-interactions through the double Higgs production from gluon fusion is a major goal of current and future collider experiments. We point out this channel could help disentangle and resolve the nature of ultraviolet contributions to Higgs couplings to two gluons. Analytic properties of the double Higgs amplitudes near kinematic threshold are used to study features resulting from scalar and fermionic loop particles mediating the interaction. Focusing on the hh invariant mass spectrum, we consider the effect from anomalous top and bottom Yukawa couplings, as well as from scalar and fermionic loop particles. In particular, the spectrum at high hh invariant mass is sensitive to the spin of the particles in the loop.
Complementarity of LHC and EDMs for Exploring Higgs CP Violation
Chien-Yi Chen, S. Dawson, Yue Zhang
Mar 05 2015 hep-ph arXiv:1503.01114v2

@misc{1503.01114, author = {Chien-Yi Chen and S.~Dawson and Yue Zhang}, title = {{C}omplementarity of {LHC} and {EDM}s for {E}xploring {H}iggs {CP} {V}iolation}, year = {2015}, eprint = {1503.01114}, note = {arXiv:1503.01114v2} }
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We analyze the constraints on a CP-violating, flavor conserving, two Higgs doublet model from the measurements of Higgs properties and from the search for heavy Higgs bosons at LHC, and show that the stronger limits typically come from the heavy Higgs search channels. The limits on CP violation arising from the Higgs sector measurements are complementary to those from EDM measurements. Combining all current constraints from low energy to colliders, we set generic upper bounds on the CP violating angle which parametrizes the CP odd component in the 126 GeV Higgs boson.
Usefulness of effective field theory for boosted Higgs production
S. Dawson, I. M. Lewis, Mao Zeng
Jan 20 2015 hep-ph arXiv:1501.04103v2

@misc{1501.04103, author = {S.~Dawson and I.~M.~Lewis and Mao Zeng}, title = {{U}sefulness of effective field theory for boosted {H}iggs production}, year = {2015}, eprint = {1501.04103}, howpublished = {Phys. Rev. D 91, 074012 (2015)}, doi = {10.1103/PhysRevD.91.074012}, note = {arXiv:1501.04103v2} }
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The Higgs + jet channel at the LHC is sensitive to the effects of new physics both in the total rate and in the transverse momentum distribution at high p_T. We examine the production process using an effective field theory (EFT) language and discuss the possibility of determining the nature of the underlying high scale physics from boosted Higgs production. The effects of heavy color triplet scalars and top partner fermions with TeV scale masses are considered as examples and Higgs-gluon couplings of dimension-5 and dimension-7 are included in the EFT. As a by-product of our study, we examine the region of validity of the EFT. Dimension-7 contributions in realistic new physics models give effects in the high p_T tail of the Higgs signal which are so tiny that they are likely to be unobservable.
Exploring Resonant di-Higgs production in the Higgs Singlet Model
Chien-Yi Chen, S. Dawson, I. M. Lewis
Oct 22 2014 hep-ph arXiv:1410.5488v2

@misc{1410.5488, author = {Chien-Yi Chen and S.~Dawson and I.~M.~Lewis}, title = {{E}xploring {R}esonant di-{H}iggs production in the {H}iggs {S}inglet {M}odel}, year = {2014}, eprint = {1410.5488}, note = {arXiv:1410.5488v2} }
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We study the enhancement of the di-Higgs production cross section resulting from the resonant decay of a heavy Higgs boson at hadron colliders in a model with a Higgs singlet. This enhancement of the double Higgs production rate is crucial in understanding the structure of the scalar potential and we determine the maximum allowed enhancement such that the electroweak minimum is a global minimum. The di-Higgs production enhancement can be as large as a factor of ~ 18 (13) for the mass of the heavy Higgs around 270 (420) GeV relative to the Standard Model rate at 14 TeV for parameters corresponding to a global electroweak minimum.
Effective Field Theory for Higgs Plus Jet Production
S. Dawson, I. M. Lewis, Mao Zeng
Sep 24 2014 hep-ph arXiv:1409.6299v2

@misc{1409.6299, author = {S.~Dawson and I.~M.~Lewis and Mao Zeng}, title = {{E}ffective {F}ield {T}heory for {H}iggs {P}lus {J}et {P}roduction}, year = {2014}, eprint = {1409.6299}, note = {arXiv:1409.6299v2} }
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We use an effective field theory (EFT) which includes all possible gluon-Higgs dimension-5 and dimension-7 operators to study Higgs boson plus jet production in next-to-leading order QCD. The EFT sheds light on the effect of a finite top quark mass as well as any Beyond-the-Standard Model (BSM) modifications of Higgs-gluon effective couplings. In the gluon channel, the accuracy of the heavy-top approximation for differential distributions arises from the non-interference between the helicity amplitudes of the G^3 h and G^2 h operators in the m_h < p_T limit at lowest order. One dimension-7 operator involving quark bilinears, however, contributes significantly at high p_T, and potentially offers a channel for seeing BSM effects. One-loop renormalization of these operators is determined, allowing resummation of large logarithms via renormalization group running. NLO numerical results at the LHC are presented, which include O(1/m_t^2) contributions in the SM limit.
Top Partners and Higgs Boson Production
Chien-Yi Chen, S. Dawson, I. M. Lewis
Jun 16 2014 hep-ph arXiv:1406.3349v3

@misc{1406.3349, author = {Chien-Yi Chen and S.~Dawson and I.~M.~Lewis}, title = {{T}op {P}artners and {H}iggs {B}oson {P}roduction}, year = {2014}, eprint = {1406.3349}, howpublished = {Phys. Rev. D 90, 035016 (2014)}, doi = {10.1103/PhysRevD.90.035016}, note = {arXiv:1406.3349v3} }
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The Higgs boson is produced at the LHC through gluon fusion at roughly the Standard Model rate. New colored fermions, which can contribute to $gg\rightarrow h$, must have vector-like interactions in order not to be in conflict with the experimentally measured rate. We examine the size of the corrections to single and double Higgs production from heavy vector-like fermions in $SU(2)_L$ singlets and doublets and search for regions of parameter space where double Higgs production is enhanced relative to the Standard Model prediction. We compare production rates and distributions for double Higgs production from gluon fusion using an exact calculation, the low energy theorem (LET), where the top quark and the heavy vector-like fermions are taken to be infinitely massive, and an effective theory (EFT) where top mass effects are included exactly and the effects of the heavy fermions are included to ${\cal O}(1/M^2_X)$. Unlike the LET, the EFT gives an extremely accurate description of the kinematic distributions for double Higgs production.
A Redux on "When is the Top Quark a Parton?"
S. Dawson, A. Ismail, Ian Low
May 27 2014 hep-ph arXiv:1405.6211v2

@misc{1405.6211, author = {S.~Dawson and A.~Ismail and Ian Low}, title = {{A} {R}edux on "{W}hen is the {T}op {Q}uark a {P}arton?"}, year = {2014}, eprint = {1405.6211}, note = {arXiv:1405.6211v2} }
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If a new heavy particle phi is produced in association with the top quark in a hadron collider, the production cross section exhibits a collinear singularity of the form log(m_phi/m_t), which can be resummed by introducing a top quark parton distribution function (PDF). We reassess the necessity of such resummation in the context of a high energy pp collider. We find that the introduction of a top PDF typically has a small effect at sqrt(S) ~ 100 TeV due to three factors: 1) alpha_s at the scale mu = m_phi is quite small when log(m_phi/m_t) is large, 2) the Bjorken x << 1 for m_phi < ~10 TeV, and 3) the kinematic region where log(m_phi/m_t) >> 1 is suppressed by phase space. We show that the effect of a top PDF is generically smaller than that of a bottom PDF in the associated production of b phi and consider the example of pp -> t H+ at next-to-leading logarithm order.
Planning the Future of U.S. Particle Physics (Snowmass 2013): Chapter 3: Energy Frontier
R. Brock, M. E. Peskin, K. Agashe, M. Artuso, J. Campbell, S. Dawson, R. Erbacher, C. Gerber, Y. Gershtein, A. Gritsan, K. Hatakeyama, J. Huston, A. Kotwal, H. Logan, M. Luty, K. Melnikov, M. Narain, M. Papucci, F. Petriello, S. Prell, et al (7)
Jan 24 2014 hep-ex astro-ph.CO hep-ph hep-th arXiv:1401.6081v1

@misc{1401.6081, author = {R.~Brock and M.~E.~Peskin and K.~Agashe and M.~Artuso and J.~Campbell and S.~Dawson and R.~Erbacher and C.~Gerber and Y.~Gershtein and A.~Gritsan and K.~Hatakeyama and J.~Huston and A.~Kotwal and H.~Logan and M.~Luty and K.~Melnikov and M.~Narain and M.~Papucci and F.~Petriello and S.~Prell and J.~Qian and R.~Schwienhorst and C.~Tully and R.~Van Kooten and D.~Wackeroth and L.~Wang and D.~Whiteson}, title = {{P}lanning the {F}uture of {U}.{S}. {P}article {P}hysics ({S}nowmass 2013): {C}hapter 3: {E}nergy {F}rontier}, year = {2014}, eprint = {1401.6081}, note = {arXiv:1401.6081v1} }
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These reports present the results of the 2013 Community Summer Study of the APS Division of Particles and Fields ("Snowmass 2013") on the future program of particle physics in the U.S. Chapter 3, on the Energy Frontier, discusses the program of research with high-energy colliders. This area includes experiments on the Higgs boson, the electroweak and strong interactions, and the top quark. It also encompasses direct searches for new particles and interactions at high energy.
Electroweak Effective Operators and Higgs Physics
Chien-Yi Chen, S. Dawson, Cen Zhang
Nov 14 2013 hep-ph hep-ex arXiv:1311.3107v2

@misc{1311.3107, author = {Chien-Yi Chen and S.~Dawson and Cen Zhang}, title = {{E}lectroweak {E}ffective {O}perators and {H}iggs {P}hysics}, year = {2013}, eprint = {1311.3107}, note = {arXiv:1311.3107v2} }
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We derive bounds from oblique parameters on the dimension-6 operators of an effective field theory of electroweak gauge bosons and the Higgs doublet. The loop- induced contributions to the S, T, and U oblique parameters are sensitive to these contributions and we pay particular attention to the role of renormalization when computing loop corrections in the effective theory. Limits on the coefficients of the effective theory from loop contributions to oblique parameters yield complementary information to direct Higgs production measurements.
Higgs Working Group Report of the Snowmass 2013 Community Planning Study
S. Dawson, A. Gritsan, H. Logan, J. Qian, C. Tully, R. Van Kooten, A. Ajaib, A. Anastassov, I. Anderson, D. Asner, O. Bake, V. Barger, T. Barklow, B. Batell, M. Battaglia, S. Berge, A. Blondel, S. Bolognesi, J. Brau, E. Brownson, et al (114)
Nov 01 2013 hep-ex hep-ph arXiv:1310.8361v2

@misc{1310.8361, author = {S.~Dawson and A.~Gritsan and H.~Logan and J.~Qian and C.~Tully and R.~Van Kooten and A.~Ajaib and A.~Anastassov and I.~Anderson and D.~Asner and O.~Bake and V.~Barger and T.~Barklow and B.~Batell and M.~Battaglia and S.~Berge and A.~Blondel and S.~Bolognesi and J.~Brau and E.~Brownson and M.~Cahill-Rowley and C.~Calancha-Paredes and C.-Y.~Chen and W.~Chou and R.~Clare and D.~Cline and N.~Craig and K.~Cranmer and M.~de Gruttola and A.~Elagin and R.~Essig and L.~Everett and E.~Feng and K.~Fujii and J.~Gainer and Y.~Gao and I.~Gogoladze and S.~Gori and R.~Goncalo and N.~Graf and C.~Grojean and S.~Guindon and H.~Haber and T.~Han and G.~Hanson and R.~Harnik and S.~Heinemeyer and U.~Heintz and J.~Hewett and Y.~Ilchenko and A.~Ishikawa and A.~Ismail and V.~Jain and P.~Janot and S.~Kanemura and S.~Kawada and R.~Kehoe and M.~Klute and A.~Kotwal and K.~Krueger and G.~Kukartsev and K.~Kumar and J.~Kunkle and M.~Kurata and I.~Lewis and Y.~Li and L.~Linssen and E.~Lipeles and R.~Lipton and T.~Liss and J.~List and T.~Liu and Z.~Liu and I.~Low and T.~Ma and P.~Mackenzie and B.~Mellado and K.~Melnikov and A.~Miyamoto and G.~Moortgat-Pick and G.~Mourou and M.~Narain and H.~Neal and J.~Nielsen and N.~Okada and H.~Okawa and J.~Olsen and H.~Ono and P.~Onyisi and N.~Parashar and M.~Peskin and F.~Petriello and T.~Plehn and C.~Pollard and C.~Potter and K.~Prokofiev and M.~Rauch and T.~Rizzo and T.~Robens and V.~Rodriguez and P.~Roloff and R.~Ruiz and V.~Sanz and J.~Sayre and Q.~Shafi and G.~Shaughnessy and M.~Sher and F.~Simon and N.~Solyak and J.~Strube and J.~Stupak and S.~Su and T.~Suehara and T.~Tanabe and T.~Tajima and V.~Telnov and J.~Tian and S.~Thomas and M.~Thomson and K.~Tsumura and C.~Un and M.~Velasco and C.~Wagner and S.~Wang and S.~Watanuki and G.~Weiglein and A.~Whitbeck and K.~Yagyu and W.~Yao and H.~Yokoya and S.~Zenz and D.~Zerwas and Y.~Zhang and Y.~Zhou}, title = {{H}iggs {W}orking {G}roup {R}eport of the {S}nowmass 2013 {C}ommunity {P}lanning {S}tudy}, year = {2013}, eprint = {1310.8361}, note = {arXiv:1310.8361v2} }
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This report summarizes the work of the Energy Frontier Higgs Boson working group of the 2013 Community Summer Study (Snowmass). We identify the key elements of a precision Higgs physics program and document the physics potential of future experimental facilities as elucidated during the Snowmass study. We study Higgs couplings to gauge boson and fermion pairs, double Higgs production for the Higgs self-coupling, its quantum numbers and $CP$-mixing in Higgs couplings, the Higgs mass and total width, and prospects for direct searches for additional Higgs bosons in extensions of the Standard Model. Our report includes projections of measurement capabilities from detailed studies of the Compact Linear Collider (CLIC), a Gamma-Gamma Collider, the International Linear Collider (ILC), the Large Hadron Collider High-Luminosity Upgrade (HL-LHC), Very Large Hadron Colliders up to 100 TeV (VLHC), a Muon Collider, and a Triple-Large Electron Positron Collider (TLEP).
Yukawa Corrections to Higgs Production in Top Partner Models
Sally Dawson, Elisabetta Furlan
Oct 29 2013 hep-ph arXiv:1310.7593v2

@misc{1310.7593, author = {Sally Dawson and Elisabetta Furlan}, title = {{Y}ukawa {C}orrections to {H}iggs {P}roduction in {T}op {P}artner {M}odels}, year = {2013}, eprint = {1310.7593}, howpublished = {Phys. Rev. D 89, 015012 (2014)}, doi = {10.1103/PhysRevD.89.015012}, note = {arXiv:1310.7593v2} }
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Higgs production from gluon fusion is sensitive to the properties of heavy colored fermions and to the Yukawa couplings, (Y_F M_F)/v, of these particles to the Higgs boson. We compute the two--loop, ${\cal O}((Y_F M_F)^3/v^3)$ contributions of new high mass fermions to Higgs production. In the Standard Model, these contributions are part of the well-known electroweak corrections and are negligible. However, in models with TeV scale fermions, such as top partner or composite models, Yukawa corrections are enhanced by effects of ${\cal O}((Y_F M_F)^3/v^3)$ and are potentially significant due to the large mass of the new quarks. We examine the size of these top partner Yukawa corrections to Higgs production for parameter choices which are allowed by precision electroweak constraints.
The Future of U.S. Particle Theory: Report of the DPF Theory Panel
M. Dine, K. Babu, C. Csaki, S. Dawson, L. Dixon, S. Gottlieb, J. Harvey, D. Whiteson
Oct 24 2013 hep-ph hep-ex hep-lat hep-th arXiv:1310.6111v2

@misc{1310.6111, author = {M.~Dine and K.~Babu and C.~Csaki and S.~Dawson and L.~Dixon and S.~Gottlieb and J.~Harvey and D.~Whiteson}, title = {{T}he {F}uture of {U}.{S}. {P}article {T}heory: {R}eport of the {DPF} {T}heory {P}anel}, year = {2013}, eprint = {1310.6111}, note = {arXiv:1310.6111v2} }
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This report summarizes the findings of the DPF Theory Panel which was formed with a goal of understanding the scientific problems and opportunities of the next decade, as well as the challenges involved in sustaining a first-class program in theoretical particle physics research in the United States.
Threshold Resummed and Approximate NNLO results for W+W- Pair Production at the LHC
S. Dawson, Ian M. Lewis, Mao Zeng
Jul 12 2013 hep-ph arXiv:1307.3249v2

@misc{1307.3249, author = {S.~Dawson and Ian M.~Lewis and Mao Zeng}, title = {{T}hreshold {R}esummed and {A}pproximate {NNLO} results for {W}+{W}- {P}air {P}roduction at the {LHC}}, year = {2013}, eprint = {1307.3249}, howpublished = {Phys. Rev. D. 88, 054028 (2013)}, doi = {10.1103/PhysRevD.88.054028}, note = {arXiv:1307.3249v2} }
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The next-to-leading order (NLO) QCD radiative corrections to W+W- production at hadron colliders are well understood. We combine NLO perturbative QCD calculations with soft-gluon resummation of threshold logarithms to find a next-to-next-to leading logarithmic (NNLL) prediction for the total cross section and the invariant mass distribution at the LHC. We also obtain approximate next-to-next-to-leading order (NNLO) results for the total W+W- cross section at the LHC which includes all contributions from the scale dependent leading singular terms. Our result for the approximate NNLO total cross section is the most precise theoretical prediction available. Uncertainties due to scale variation are shown to be small when the threshold logarithms are included. NNLL threshold resummation increases the W+W- invariant mass distribution by ~ 3-4% in the peak region for both \sqrtS=8 and 14 TeV. The NNLL threshold resummed and approximate NNLO cross sections increase the NLO cross section by 0.5-3% for \sqrtS=7, 8, 13, and 14 TeV.
Heavy Higgs Searches and Constraints on Two Higgs Doublet Models
Chien-Yi Chen, S. Dawson, Marc Sher
May 08 2013 hep-ph arXiv:1305.1624v3

@misc{1305.1624, author = {Chien-Yi Chen and S.~Dawson and Marc Sher}, title = {{H}eavy {H}iggs {S}earches and {C}onstraints on {T}wo {H}iggs {D}oublet {M}odels}, year = {2013}, eprint = {1305.1624}, doi = {10.1103/PhysRevD.88.015018}, note = {arXiv:1305.1624v3} }
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Since the discovery of a Higgs boson at the LHC and the measurement of many of its branching ratios, there have been numerous studies exploring the restrictions these results place on the parameter space of two Higgs doublet models. We extend these results to include the full data set and study the expected sensitivity that can be obtained with 300 and 3000 inverse femptobarn of integrated luminosity. We consider searches for a heavy Standard Model Higgs boson, with a mass ranging from 200 to 400 GeV, and show that the non-observation of such a Higgs boson can substantially narrow the allowed regions of parameter space in two Higgs doublet models.
CP violating anomalous couplings in $W\gamma$ and $Z\gamma$ production at the LHC
Sally Dawson, Sudhir Kumar Gupta, German Valencia
Apr 15 2013 hep-ph hep-ex arXiv:1304.3514v2

@misc{1304.3514, author = {Sally Dawson and Sudhir Kumar Gupta and German Valencia}, title = {{CP} violating anomalous couplings in ${W}\gamma$ and ${Z}\gamma$ production at the {LHC}}, year = {2013}, eprint = {1304.3514}, doi = {10.1103/PhysRevD.88.035008}, note = {arXiv:1304.3514v2} }
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The ATLAS and CMS collaborations have recently published new limits on CP conserving anomalous couplings from the $W\gamma$ and $Z\gamma$ production processes. We study the corresponding limits that can be placed on the CP violating anomalous couplings $\kappa_tilde_\gamma$ and $h^1_{\gamma, Z}$ at the LHC. We find that the process $pp --> W\gamma$ at 14 TeV can place the 95% CL limit $|\kappa_tilde_\gamma| <~ 0.05$ with 10 fb^-1 which is comparable to the existing LHC bound on the CP conserving anomalous couplings $\kappa_\gamma$. Similarly, the process $pp --> Z\gamma$ can place the 95% CL limits $|h^1_\gamma| <~ 20$ and $|h^1_Z| <~ 40$ respectively. None of these limits is derived from a truly CP-odd observable so that it is not possible to separate the effects of the CP violating anomalous couplings from the rest.
Exploring Two Higgs Doublet Models Through Higgs Production
Chien-Yi Chen, S. Dawson
Jan 03 2013 hep-ph hep-ex arXiv:1301.0309v2

@misc{1301.0309, author = {Chien-Yi Chen and S.~Dawson}, title = {{E}xploring {T}wo {H}iggs {D}oublet {M}odels {T}hrough {H}iggs {P}roduction}, year = {2013}, eprint = {1301.0309}, doi = {10.1103/PhysRevD.87.055016}, note = {arXiv:1301.0309v2} }
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We discuss the connections between the recently observed Higgs-like particle and rare B decays in the context of two Higgs doublet models (2HDMs). The measured decays of the Higgs boson to fermions and gauge bosons, along with the observation of the decay B_s -> \mu+ \mu-, place stringent restrictions on the allowed parameter space of 2 Higgs doublet models. Future measurements of h0 -> \gamma \gamma can potentially exclude type I 2HDMs, while the parameters of other 2HDMs are already severely restricted. The recent observations of the h0 -> \tau+ \tau- and h0 -> b bbar decays further constrain the models.
Unravelling an extended quark sector through multiple Higgs production?
Sally Dawson, Elisabetta Furlan, Ian Lewis
Oct 25 2012 hep-ph arXiv:1210.6663v3

@misc{1210.6663, author = {Sally Dawson and Elisabetta Furlan and Ian Lewis}, title = {{U}nravelling an extended quark sector through multiple {H}iggs production?}, year = {2012}, eprint = {1210.6663}, doi = {10.1103/PhysRevD.87.014007}, note = {arXiv:1210.6663v3} }
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In many new physics scenarios, the particle content of the Standard Model is extended and the Higgs couplings are modified, sometimes without affecting single Higgs production. We analyse two models with additional quarks. In these models, we compute double Higgs production from gluon fusion exactly at leading-order, and present analytical results in the heavy-quark mass ap- proximation. The experimental bounds from precision electroweak measurements and from the measured rate of single Higgs production combine to give significant restrictions for the allowed deviation of the double Higgs production rate from the Standard Model prediction as well as on the branching ratio for the Higgs decay into photons. The two models analysed eventually present a similar Higgs phenomenology as the Standard Model. We connect this result to the magnitude of the dimension six operators contributing to the gluon-fusion Higgs production.
Resummation Effects in Vector-Boson and Higgs Associated Production
S. Dawson, T. Han, W. K. Lai, A. K. Leibovich, I. Lewis
Jul 18 2012 hep-ph arXiv:1207.4207v2

@misc{1207.4207, author = {S.~Dawson and T.~Han and W.~K.~Lai and A.~K.~Leibovich and I.~Lewis}, title = {{R}esummation {E}ffects in {V}ector-{B}oson and {H}iggs {A}ssociated {P}roduction}, year = {2012}, eprint = {1207.4207}, doi = {10.1103/PhysRevD.86.074007}, note = {arXiv:1207.4207v2} }
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Fixed-order QCD radiative corrections to the vector-boson and Higgs associated production channels, pp -> VH (V=W, Z), at hadron colliders are well understood. We combine higher order perturbative QCD calculations with soft-gluon resummation of both threshold logarithms and logarithms which are important at low transverse momentum of the VH pair. We study the effects of both types of logarithms on the scale dependence of the total cross section and on various kinematic distributions. The next-to-next-to-next-to-leading logarithmic (NNNLL) resummed total cross sections at the LHC are almost identical to the fixed-order perturbative next-to-next-to-leading order (NNLO) rates, indicating the excellent convergence of the perturbative QCD series. Resummation of the VH transverse momentum (p_T) spectrum provides reliable results for small values of p_T and suggests that implementing a jet-veto will significantly decrease the cross sections.
A Higgs Conundrum with Vector Fermions
S. Dawson, E. Furlan
May 22 2012 hep-ph arXiv:1205.4733v2

@misc{1205.4733, author = {S.~Dawson and E.~Furlan}, title = {{A} {H}iggs {C}onundrum with {V}ector {F}ermions}, year = {2012}, eprint = {1205.4733}, doi = {10.1103/PhysRevD.86.015021}, note = {arXiv:1205.4733v2} }
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Many models of Beyond the Standard Model physics involve heavy colored fermions. We study models where the new fermions have vector interactions and examine the connection between electroweak precision measurements and Higgs production. In particular, for parameters which are allowed by precision measurements, we show that the gluon fusion Higgs cross section and the Higgs decay branching ratios must be close to those predicted by the Standard Model. The models we discuss thus represent scenarios with new physics which will be extremely difficult to distinguish from the minimal Standard Model. We pay particular attention to the decoupling properties of the vector fermions.
Handbook of LHC Higgs Cross Sections: 2. Differential Distributions
LHC Higgs Cross Section Working Group, S. Dittmaier, C. Mariotti, G. Passarino, R. Tanaka, S. Alekhin, J. Alwall, E. A. Bagnaschi, A. Banfi, J. Blumlein, S. Bolognesi, N. Chanon, T. Cheng, L. Cieri, A. M. Cooper-Sarkar, M. Cutajar, S. Dawson, G. Davies, N. De Filippis, G. Degrassi, et al (101)
Jan 17 2012 hep-ph hep-ex arXiv:1201.3084v1

@misc{1201.3084, author = {LHC Higgs Cross Section Working Group and S.~Dittmaier and C.~Mariotti and G.~Passarino and R.~Tanaka and S.~Alekhin and J.~Alwall and E.~A.~Bagnaschi and A.~Banfi and J.~Blumlein and S.~Bolognesi and N.~Chanon and T.~Cheng and L.~Cieri and A.~M.~Cooper-Sarkar and M.~Cutajar and S.~Dawson and G.~Davies and N.~De Filippis and G.~Degrassi and A.~Denner and D.~D'Enterria and S.~Diglio and B.~Di Micco and R.~Di Nardo and R.~K.~Ellis and A.~Farilla and S.~Farrington and M.~Felcini and G.~Ferrera and M.~Flechl and D.~de Florian and S.~Forte and S.~Ganjour and M.~V.~Garzelli and S.~Gascon-Shotkin and S.~Glazov and S.~Goria and M.~Grazzini and J.-Ph.~Guillet and C.~Hackstein and K.~Hamilton and R.~Harlander and M.~Hauru and S.~Heinemeyer and S.~Hoche and J.~Huston and C.~Jackson and P.~Jimenez-Delgado and M.~D.~Jorgensen and M.~Kado and S.~Kallweit and A.~Kardos and N.~Kauer and H.~Kim and M.~Kovac and M.~Kramer and F.~Krauss and C.-M.~Kuo and S.~Lehti and Q.~Li and N.~Lorenzo and F.~Maltoni and B.~Mellado and S.~O.~Moch and A.~Muck and M.~Muhlleitner and P.~Nadolsky and P.~Nason and C.~Neu and A.~Nikitenko and C.~Oleari and J.~Olsen and S.~Palmer and S.~Paganis and C.~G.~Papadopoulos and T .C.~Petersen and F.~Petriello and F.~Petrucci and G.~Piacquadio and E.~Pilon and C.~T.~Potter and J.~Price and I.~Puljak and W.~Quayle and V.~Radescu and D.~Rebuzzi and L.~Reina and J.~Rojo and D.~Rosco and G.~P.~Salam and A.~Sapronov and J.~Schaarschmidt and M.~Schonherr and M.~Schumacher and F.~Siegert and P.~Slavich and M.~Spira and I.~W.~Stewart and W.~J.~Stirling and F.~Stockli and C.~Sturm and F.~J.~Tackmann and R.~S.~Thorne and D.~Tommasini and P.~Torrielli and F.~Tramontano and Z.~Trocsanyi and M.~Ubiali and S.~Uccirati and M.~Vazquez Acosta and T.~Vickey and A.~Vicini and W.~J.~Waalewijn and D.~Wackeroth and M.~Warsinsky and M.~Weber and M.~Wiesemann and G.~Weiglein and J.~Yu and G.~Zanderighi}, title = {{H}andbook of {LHC} {H}iggs {C}ross {S}ections: 2. {D}ifferential {D}istributions}, year = {2012}, eprint = {1201.3084}, doi = {10.5170/CERN-2012-002}, note = {arXiv:1201.3084v1} }
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This Report summarises the results of the second year's activities of the LHC Higgs Cross Section Working Group. The main goal of the working group was to present the state of the art of Higgs Physics at the LHC, integrating all new results that have appeared in the last few years. The first working group report Handbook of LHC Higgs Cross Sections: 1. Inclusive Observables (CERN-2011-002) focuses on predictions (central values and errors) for total Higgs production cross sections and Higgs branching ratios in the Standard Model and its minimal supersymmetric extension, covering also related issues such as Monte Carlo generators, parton distribution functions, and pseudo-observables. This second Report represents the next natural step towards realistic predictions upon providing results on cross sections with benchmark cuts, differential distributions, details of specific decay channels, and further recent developments.
SQCD Corrections to bg -> bh
S.Dawson, C.B.Jackson, P. Jaiswal
Oct 11 2011 hep-ph arXiv:1110.2161v1

@misc{1110.2161, author = {S.Dawson and C.B.Jackson and P.~Jaiswal}, title = {{SQCD} {C}orrections to bg -> bh}, year = {2011}, eprint = {1110.2161}, note = {arXiv:1110.2161v1} }
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In the Minimal Supersymmetric Standard Model, the effective b quark Yukawa coupling to the lightest neutral Higgs boson is enhanced. Therefore, the associated production of the lightest Higgs boson with a b quark is an important discovery channel. We consider the SUSY QCD contributions from squarks and gluinos and discuss the decoupling properties of these effects. A comparision of our exact Order(alpha_s) results with those of a widely used effective Lagrangian approach, the Delta_b approximation, is also presented.
SUSY QCD Corrections to Higgs-b Production : Is the \Delta_b Approximation Accurate?
S. Dawson, C. B. Jackson, P. Jaiswal
Apr 11 2011 hep-ph arXiv:1104.1631v2

@misc{1104.1631, author = {S.~Dawson and C.~B.~Jackson and P.~Jaiswal}, title = {{SUSY} {QCD} {C}orrections to {H}iggs-b {P}roduction : {I}s the \{D}elta_b {A}pproximation {A}ccurate?}, year = {2011}, eprint = {1104.1631}, howpublished = {Phys.Rev.D83:115007,2011}, doi = {10.1103/PhysRevD.83.115007}, note = {arXiv:1104.1631v2} }
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The associated production of a Higgs boson with a b quark is a discovery channel for the lightest MSSM neutral Higgs boson. We consider the SUSY QCD contributions from squarks and gluinos and discuss the decoupling properties of these effects. A detailed comparison of our exact order(alpha_s) results with those of a widely used effective Lagrangian approach, the \Delta_b approximation, is presented. The \Delta_b approximation is shown to accurately reproduce the exact one-loop SQCD result to within a few percent over a wide range of parameter space.
Handbook of LHC Higgs Cross Sections: 1. Inclusive Observables
LHC Higgs Cross Section Working Group, S. Dittmaier, C. Mariotti, G. Passarino, R. Tanaka, J. Baglio, P. Bolzoni, R. Boughezal, O. Brein, C. Collins-Tooth, S. Dawson, S. Dean, A. Denner, S. Farrington, M. Felcini, M. Flechl, D. de Florian, S. Forte, M. Grazzini, C. Hackstein, et al (45)
Jan 04 2011 hep-ph hep-ex arXiv:1101.0593v3

@misc{1101.0593, author = {LHC Higgs Cross Section Working Group and S.~Dittmaier and C.~Mariotti and G.~Passarino and R.~Tanaka and J.~Baglio and P.~Bolzoni and R.~Boughezal and O.~Brein and C.~Collins-Tooth and S.~Dawson and S.~Dean and A.~Denner and S.~Farrington and M.~Felcini and M.~Flechl and D.~de Florian and S.~Forte and M.~Grazzini and C.~Hackstein and T.~Hahn and R.~Harlander and T.~Hartonen and S.~Heinemeyer and J.~Huston and A.~Kalinowski and M.~Krämer and F.~Krauss and J.S.~Lee and S.~Lehti and F.~Maltoni and K.~Mazumdar and S.-O.~Moch and A.~Mück and M.Mühlleitner and P.~Nason and C.~Neu and C.~Oleari and J.~Olsen and S.~Palmer and F.~Petriello and G.~Piacquadio and A.~Pilaftsis and C.T.~Potter and I.~Puljak and J.~Qian and D.~Rebuzzi and L.~Reina and H.~Rzehak and M.~Schumacher and P.~Slavich and M.~Spira and F.~Stöckli and R.S.~Thorne and M.~Vazquez Acosta and T.~Vickey and A.~Vicini and D.~Wackeroth and M.~Warsinsky and M.~Weber and G.~Weiglein and C.~Weydert and J.~Yu and M.~Zaro and T.~Zirke}, title = {{H}andbook of {LHC} {H}iggs {C}ross {S}ections: 1. {I}nclusive {O}bservables}, year = {2011}, eprint = {1101.0593}, doi = {10.5170/CERN-2011-002}, note = {arXiv:1101.0593v3} }
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This Report summarizes the results of the first 10 months' activities of the LHC Higgs Cross Sections Working Group. The main goal of the working group was to present the status-of-art on Higgs Physics at the LHC integrating all new results that have appeared in the last few years. The Report is more than a mere collection of the proceedings of the general meetings. The subgroups have been working in different directions. An attempt has been made to present the first Report from these subgroups in a complete and homogeneous form. The subgroups' contributions correspondingly comprise the main parts of the Report. A significant amount of work has been performed in providing higher-order corrections to the Higgs-boson cross sections and pinning down the theoretical uncertainty of the Standard Model predictions. This Report comprises explicit numerical results on total cross sections, leaving the issues of event selection cuts and differential distributions to future publications. The subjects for further study are identified.
Associated b-Quark Higgs Boson Production at the LHC
S. Dawson, C. B. Jackson, P. Jaiswal
Dec 03 2010 hep-ph arXiv:1012.0341v1

@misc{1012.0341, author = {S.~Dawson and C.~B.~Jackson and P.~Jaiswal}, title = {{A}ssociated b-{Q}uark {H}iggs {B}oson {P}roduction at the {LHC}}, year = {2010}, eprint = {1012.0341}, howpublished = {PoS ICHEP2010:052,2010}, note = {arXiv:1012.0341v1} }
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The associated production of a Higgs boson with a b quark is a discovery mode for an MSSM Higgs boson at large tan beta. We present updates on the production rate at the LHC, along with a discussion of the importance of the SQCD corrections from squark and gluino loops. We also discuss the purely electroweak contributions.
Four Generations, Higgs Physics, and the MSSM
S. Dawson, P. Jaiswal
Sep 07 2010 hep-ph arXiv:1009.1099v2

@misc{1009.1099, author = {S.~Dawson and P.~Jaiswal}, title = {{F}our {G}enerations, {H}iggs {P}hysics, and the {MSSM}}, year = {2010}, eprint = {1009.1099}, howpublished = {Phys.Rev.D82:073017,2010}, doi = {10.1103/PhysRevD.82.073017}, note = {arXiv:1009.1099v2} }
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We consider the effects of a fourth generation of chiral fermions within the MSSM. Such a model offers the possibility of having the lightest neutral Higgs boson significantly heavier than in the three generation MSSM. The model is highly constrained by precision electroweak data, along with Higgs searches at the Tevatron. In addition, the requirements of perturbative unitarity and direct searches for heavy quarks imply that the four generation MSSM is only consistent for tan beta ~ 1 and highly tuned 4th generation fermion masses.
Weak Corrections to Associated Higgs-Bottom Quark Production
S. Dawson, P. Jaiswal
Feb 16 2010 hep-ph arXiv:1002.2672v2

@misc{1002.2672, author = {S.~Dawson and P.~Jaiswal}, title = {{W}eak {C}orrections to {A}ssociated {H}iggs-{B}ottom {Q}uark {P}roduction}, year = {2010}, eprint = {1002.2672}, howpublished = {Phys.Rev.D81:073008,2010}, doi = {10.1103/PhysRevD.81.073008}, note = {arXiv:1002.2672v2} }
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In models with an enhanced coupling of the Higgs boson to the bottom quark, the dominant production mechanism in hadronic collisions is often the partonic sub-process, bg ->bH. We derive the weak corrections to this process and show that they can be accurately approximated by an "Improved Born Approximation". At the Tevatron, these corrections are negligible and are dwarfed by PDF and scale uncertainties for M_H < 200 GeV. At the LHC, the weak corrections are small for M_H < 500 GeV. For large Higgs boson masses, the corrections become significant, and are ~18% for M_H ~ 1 TeV at E_CM=10 TeV.
The Hunt for New Physics at the Large Hadron Collider
P. Nath, B.D. Nelson, H. Davoudiasl, B. Dutta, D. Feldman, Z. Liu, T. Han, P. Langacker, R. Mohapatra, J. Valle, A. Pilaftsis, D. Zerwas, S. AbdusSalam, C. Adam-Bourdarios, J.A. Aguilar-Saavedra, B. Allanach, B. Altunkaynak, L.A. Anchordoqui, H. Baer, B. Bajc, et al (67)
Jan 16 2010 hep-ph arXiv:1001.2693v1

@misc{1001.2693, author = {P.~Nath and B.D.~Nelson and H.~Davoudiasl and B.~Dutta and D.~Feldman and Z.~Liu and T.~Han and P.~Langacker and R.~Mohapatra and J.~Valle and A.~Pilaftsis and D.~Zerwas and S.~AbdusSalam and C.~Adam-Bourdarios and J.A.~Aguilar-Saavedra and B.~Allanach and B.~Altunkaynak and L.A.~Anchordoqui and H.~Baer and B.~Bajc and O.~Buchmueller and M.~Carena and R.~Cavanaugh and S.~Chang and K.~Choi and C.~Csaki and S.~Dawson and F.~de Campos and A.~De Roeck and M.~Duhrssen and O.J.P.~Eboli and J.R.~Ellis and H.~Flacher and H.~Goldberg and W.~Grimus and U.~Haisch and S.~Heinemeyer and M.~Hirsch and M.~Holmes and T.~Ibrahim and G.~Isidori and G.~Kane and K.~Kong and R.~Lafaye and G.~Landsberg and L.~Lavoura and J.S.~Lee and S.J.~Lee and M.~Lisanti and D.~Lust and M.B.~Magro and R.~Mahbubani and M.~Malinsky and F.~Maltoni and S.~Morisi and M.M.~Muhlleitner and B.~Mukhopadhyaya and M.~Neubert and K.A.~Olive and G.~Perez and P.~Fileviez Perez and T.~Plehn and E.~Ponton and W.~Porod and F.~Quevedo and M.~Rauch and D.~Restrepo and T.G.~Rizzo and J.C.~Romao and F.J.~Ronga and J.~Santiago and J.~Schechter and G.~Senjanovic and J.~Shao and M.~Spira and S.~Stieberger and Z.~Sullivan and T.M.P.~Tait and X.~Tata and T.R.~Taylor and M.~Toharia and J.~Wacker and C.E.M.~Wagner and L.-T.~Wang and G.~Weiglein and D.~Zeppenfeld and K.~Zurek}, title = {{T}he {H}unt for {N}ew {P}hysics at the {L}arge {H}adron {C}ollider}, year = {2010}, eprint = {1001.2693}, howpublished = {Nucl.Phys.B, Proc.Suppl.200-202 2010:185-417,2010}, doi = {10.1016/j.nuclphysbps.2010.03.001}, note = {arXiv:1001.2693v1} }
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The Large Hadron Collider presents an unprecedented opportunity to probe the realm of new physics in the TeV region and shed light on some of the core unresolved issues of particle physics. These include the nature of electroweak symmetry breaking, the origin of mass, the possible constituent of cold dark matter, new sources of CP violation needed to explain the baryon excess in the universe, the possible existence of extra gauge groups and extra matter, and importantly the path Nature chooses to resolve the hierarchy problem - is it supersymmetry or extra dimensions. Many models of new physics beyond the standard model contain a hidden sector which can be probed at the LHC. Additionally, the LHC will be a top factory and accurate measurements of the properties of the top and its rare decays will provide a window to new physics. Further, the LHC could shed light on the origin of neutralino masses if the new physics associated with their generation lies in the TeV region. Finally, the LHC is also a laboratory to test the hypothesis of TeV scale strings and D-brane models. An overview of these possibilities is presented in the spirit that it will serve as a companion to the Technical Design Reports (TDRs) by the particle detector groups ATLAS and CMS to facilitate the test of the new theoretical ideas at the LHC. Which of these ideas stands the test of the LHC data will govern the course of particle physics in the subsequent decades.
From the LHC to Future Colliders
A. De Roeck, J. Ellis, C. Grojean, S. Heinemeyer, K. Jakobs, G. Weiglein, J. Wells, G. Azuelos, S. Dawson, B. Gripaios, T. Han, J. Hewett, M. Lancaster, C. Mariotti, F. Moortgat, G. Moortgat-Pick, G. Polesello, S. Riemann, M. Schumacher, K. Assamagan, et al (44)
Sep 18 2009 hep-ph hep-ex arXiv:0909.3240v1

@misc{0909.3240, author = {A.~De Roeck and J.~Ellis and C.~Grojean and S.~Heinemeyer and K.~Jakobs and G.~Weiglein and J.~Wells and G.~Azuelos and S.~Dawson and B.~Gripaios and T.~Han and J.~Hewett and M.~Lancaster and C.~Mariotti and F.~Moortgat and G.~Moortgat-Pick and G.~Polesello and S.~Riemann and M.~Schumacher and K.~Assamagan and P.~Bechtle and M.~Carena and G.~Chachamis and K.F.~Chen and S.~De Curtis and K.~Desch and M.~Dittmar and H.~Dreiner and M.~Dührssen and B.~Foster and M.T.~Frandsen and A.~Giammanco and R.~Godbole and P.~Govoni and J.~Gunion and W.~Hollik and W.S.~Hou and G.~Isidori and A.~Juste and J.~Kalinowski and A.~Korytov and E.~Kou and S.~Kraml and M.~Krawczyk and A.~Martin and D.~Milstead and V.~Morton-Thurtle and K.~Moenig and B.~Mele and E.~Ozcan and M.~Pieri and T.~Plehn and L.~Reina and E.~Richter-Was and T.~Rizzo and K.~Rolbiecki and F.~Sannino and M.~Schram and J.~Smillie and S.~Sultansoy and J.~Tattersall and P.~Uwer and B.~Webber and P.~Wienemann}, title = {{F}rom the {LHC} to {F}uture {C}olliders}, year = {2009}, eprint = {0909.3240}, howpublished = {Eur.Phys.J.C66:525-583,2010}, doi = {10.1140/epjc/s10052-010-1244-3}, note = {arXiv:0909.3240v1} }
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Discoveries at the LHC will soon set the physics agenda for future colliders. This report of a CERN Theory Institute includes the summaries of Working Groups that reviewed the physics goals and prospects of LHC running with 10 to 300/fb of integrated luminosity, of the proposed sLHC luminosity upgrade, of the ILC, of CLIC, of the LHeC and of a muon collider. The four Working Groups considered possible scenarios for the first 10/fb of data at the LHC in which (i) a state with properties that are compatible with a Higgs boson is discovered, (ii) no such state is discovered either because the Higgs properties are such that it is difficult to detect or because no Higgs boson exists, (iii) a missing-energy signal beyond the Standard Model is discovered as in some supersymmetric models, and (iv) some other exotic signature of new physics is discovered. In the contexts of these scenarios, the Working Groups reviewed the capabilities of the future colliders to study in more detail whatever new physics may be discovered by the LHC. Their reports provide the particle physics community with some tools for reviewing the scientific priorities for future colliders after the LHC produces its first harvest of new physics from multi-TeV collisions.
Hiding the Higgs Boson with Multiple Scalars
Sally Dawson, Wenbin Yan
Apr 14 2009 hep-ph arXiv:0904.2005v1

@misc{0904.2005, author = {Sally Dawson and Wenbin Yan}, title = {{H}iding the {H}iggs {B}oson with {M}ultiple {S}calars}, year = {2009}, eprint = {0904.2005}, howpublished = {Phys.Rev.D79:095002,2009}, doi = {10.1103/PhysRevD.79.095002}, note = {arXiv:0904.2005v1} }
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We consider models with multiple Higgs scalar gauge singlets and the resulting restrictions on the parameters from precision electroweak measurements. In these models, the scalar singlets mix with the SU(2) Higgs doublet, potentially leading to reduced couplings of the scalars to fermions and gauge bosons relative to the Standard Model Higgs boson couplings. Such models can make the Higgs sector difficult to explore at the LHC. We emphasize the new physics resulting from the addition of at least two scalar Higgs singlets.
Introduction to Electroweak Symmetry Breaking
S. Dawson
Dec 12 2008 hep-ph arXiv:0812.2190v1

@misc{0812.2190, author = {S.~Dawson}, title = {{I}ntroduction to {E}lectroweak {S}ymmetry {B}reaking}, year = {2008}, eprint = {0812.2190}, howpublished = {AIP Conf.Proc.1116:11-34,2009}, doi = {10.1063/1.3131544}, note = {arXiv:0812.2190v1} }
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In these lectures, I review the status of the electroweak sector of the Standard Model, with an emphasis on the importance of radiative corrections and searches for the Standard Model Higgs boson. A discussion of the special role of the TeV energy scale in electroweak physics is included.
One-loop Corrections to the S Parameter in the Four-site Model
Sally Dawson, C.B. Jackson
Oct 29 2008 hep-ph arXiv:0810.5068v1

@misc{0810.5068, author = {Sally Dawson and C.B.~Jackson}, title = {{O}ne-loop {C}orrections to the {S} {P}arameter in the {F}our-site {M}odel}, year = {2008}, eprint = {0810.5068}, doi = {10.1103/PhysRevD.79.013006}, note = {arXiv:0810.5068v1} }
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We compute the leading chiral-logarithmic corrections to the S parameter in the four-site Higgsless model. In addition to the usual electroweak gauge bosons of the Standard Model, this model contains two sets of heavy charged and neutral gauge bosons. In the continuum limit, the latter gauge bosons can be identified with the first excited Kaluza-Klein states of the W^\pm and Z bosons of a warped extra-dimensional model with an SU(2)_L \times SU(2)_R \times U(1)_X bulk gauge symmetry. We consider delocalized fermions and show that the delocalization parameter must be considerably tuned from its tree-level ideal value in order to reconcile experimental constraints with the one-loop results. Hence, the delocalization of fermions does not solve the problem of large contributions to the S parameter in this class of theories and significant contributions to S can potentially occur at one-loop.
Higgs Triplets, Decoupling, and Precision Measurements
Mu-Chun Chen, Sally Dawson, C. B. Jackson
Sep 25 2008 hep-ph arXiv:0809.4185v1

@misc{0809.4185, author = {Mu-Chun Chen and Sally Dawson and C.~B.~Jackson}, title = {{H}iggs {T}riplets, {D}ecoupling, and {P}recision {M}easurements}, year = {2008}, eprint = {0809.4185}, howpublished = {Phys.Rev.D78:093001,2008}, doi = {10.1103/PhysRevD.78.093001}, note = {arXiv:0809.4185v1} }
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Electroweak precision data has been extensively used to constrain models containing physics beyond that of the Standard Model. When the model contains Higgs scalars in representations other than SU(2) singlets or doublets, and hence rho not equal to one at tree level, a correct renormalization scheme requires more inputs than the three needed for the Standard Model. We discuss the connection between the renormalization of models with Higgs triplets and the decoupling properties of the models as the mass scale for the scalar triplet field becomes much larger than the electroweak scale. The requirements of perturbativity of the couplings and agreement with electroweak data place strong restrictions on models with Higgs triplets. Our results have important implications for Little Higgs type models and other models with rho not equal to one at tree level.
Higgs Working Group Summary Report
S. Dawson, M. Grazzini, A. Nikitenko, M. Schumacher, N. E. Adam, T. Aziz, J.R. Andersen, A. Belyaev, T. Binoth, S. Catani, M. Ciccolini, J.E. Cole, S. Dawson, A.Denner, S. Dittmaier, A. Djouadi, M. Drees, U. Ellwanger, C. Englert, T. Figy, et al (43)
Mar 10 2008 hep-ph arXiv:0803.1154v1

@misc{0803.1154, author = {S.~Dawson and M.~Grazzini and A.~Nikitenko and M.~Schumacher and N.~E.~Adam and T.~Aziz and J.R.~Andersen and A.~Belyaev and T.~Binoth and S.~Catani and M.~Ciccolini and J.E.~Cole and S.~Dawson and A.Denner and S.~Dittmaier and A.~Djouadi and M.~Drees and U.~Ellwanger and C.~Englert and T.~Figy and E.~Gabrielli and D.~Giordano and S.~Gleyzer and R.~Godbole and M.~Grazzini and S.~Greder and V.~Halyo and M.~Hashemi and S.~Heinemeyer and G.~Heinrich and M.~Herquet and S.~Hesselbach and C.~Hugonie and C.B.~Jackson and N.~Kauer and R.~Kinnunen and S.F.~King and S.~Lehti and F.~Maltoni and B.~Mele and P.~Mertsch and M.~Moretti and S.~Moretti and M.~Muhlleitner and A.K.~Nayak and A.~Nikitenko and C.~Oleari and F.~Piccinini and R.~Pittau and J.~Rathsman and I.~Rottlaender and C.H.~Shepherd-Themistocleous and M.~Schumacher and J.M.~Smillie and A.~Sopczak and M.~Spira and M.~Takahashi and A.~M.~Teixeira and I.R.~Tomalin and M.~Vazquez Acosta and G.~Weiglein and C.D.~White and D.~Zeppenfeld}, title = {{H}iggs {W}orking {G}roup {S}ummary {R}eport}, year = {2008}, eprint = {0803.1154}, note = {arXiv:0803.1154v1} }
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Report of the Working Group on Higgs Bosons for the Workshop, ``Physics at TeV Colliders'', Les Houches, France, 11-29 June, 2007.
SUSY QCD Corrections to Higgs Pair Production from Bottom Quark Fusion
Sally Dawson, Chung Kao, Yili Wang
Oct 24 2007 hep-ph arXiv:0710.4331v1

@misc{0710.4331, author = {Sally Dawson and Chung Kao and Yili Wang}, title = {{SUSY} {QCD} {C}orrections to {H}iggs {P}air {P}roduction from {B}ottom {Q}uark {F}usion}, year = {2007}, eprint = {0710.4331}, howpublished = {Phys.Rev.D77:113005,2008}, doi = {10.1103/PhysRevD.77.113005}, note = {arXiv:0710.4331v1} }
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We present a complete next-to-leading order (NLO) calculation for the total cross section for inclusive Higgs pair production via bottom-quark fusion at the CERN Large Hadron Collider (LHC) in the minimal supersymmetric standard model (MSSM) and the minimal supergravity model (mSUGRA). We emphasize the contributions of squark and gluino loops (SQCD) and the decoupling properties of our results for heavy squark and gluino masses. The enhanced couplings of the b quark to the Higgs bosons in supersymmetric models with large tanb yield large NLO SQCD corrections in some regions of parameter space.
SUSY QCD Corrections to Associated Higgs-bottom Quark Production
S. Dawson, C. B. Jackson
Oct 01 2007 hep-ph arXiv:0709.4519v2

@misc{0709.4519, author = {S.~Dawson and C.~B.~Jackson}, title = {{SUSY} {QCD} {C}orrections to {A}ssociated {H}iggs-bottom {Q}uark {P}roduction}, year = {2007}, eprint = {0709.4519}, howpublished = {Phys.Rev.D77:015019,2008}, doi = {10.1103/PhysRevD.77.015019}, note = {arXiv:0709.4519v2} }
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The associated production of a Higgs boson with a b quark is a discovery mode for an MSSM Higgs boson at large tan beta. We compute the SUSY QCD corrections from gluino and squark loops to this process and combine them with the order alpha_s^2 NLO QCD corrections to obtain reliable predictions for the rate. Finally, we compare our results with an effective Lagrangian approximation which includes only the low energy corrections from squark and gluino loops to the b- bbar- Higgs vertices.
Chiral-logarithmic Corrections to the S and T Parameters in Higgsless Models
S. Dawson, C.B. Jackson
Mar 29 2007 hep-ph arXiv:hep-ph/0703299v2

@misc{hep-ph/0703299, author = {S.~Dawson and C.B.~Jackson}, title = {{C}hiral-logarithmic {C}orrections to the {S} and {T} {P}arameters in {H}iggsless {M}odels}, year = {2007}, eprint = {hep-ph/0703299}, howpublished = {Phys.Rev.D76:015014,2007}, doi = {10.1103/PhysRevD.76.015014}, note = {arXiv:hep-ph/0703299v2} }
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Recently, Higgsless models have proven to be viable alternatives to the Standard Model (SM) and supersymmetric models in describing the breaking of the electroweak symmetry. Whether extra-dimensional in nature or their deconstructed counterparts, the physical spectrum of these models typically consists of ``towers'' of massive vector gauge bosons which carry the same quantum numbers as the SM W and Z. In this paper, we calculate the one-loop, chiral-logarithmic corrections to the S and T parameters from the lightest (i.e. SM) and the next-to-lightest gauge bosons using a novel application of the Pinch Technique. We perform our calculation using generic Feynman rules with generic couplings such that our results can be applied to various models. To demonstrate how to use our results, we calculate the leading chiral-logarithmic corrections to the S and T parameters in the deconstructed three site Higgsless model. As we point out, however, our results are not exclusive to Higgsless models and may, in fact, be used to calculate the one-loop corrections from additional gauge bosons in models with fundamental (or composite) Higgs bosons.
Tevatron-for-LHC Report: Higgs
U. Aglietti, A. Belyaev, S. Berge, A. Blum, R. Bonciani, J. Cammin, M. Carena, S. Chivukula, H. Davoudiasl, S. Dawson, G. Degrassi, A. Dominguez, J. Donini, T. Dorigo, B.J. Field, T. Hahn, T. Han, S. Heinemeyer, S. Hesselbach, G.-Y. Huang, et al (24)
Dec 15 2006 hep-ph arXiv:hep-ph/0612172v2

@misc{hep-ph/0612172, author = {U.~Aglietti and A.~Belyaev and S.~Berge and A.~Blum and R.~Bonciani and J.~Cammin and M.~Carena and S.~Chivukula and H.~Davoudiasl and S.~Dawson and G.~Degrassi and A.~Dominguez and J.~Donini and T.~Dorigo and B.J.~Field and T.~Hahn and T.~Han and S.~Heinemeyer and S.~Hesselbach and G.-Y.~Huang and I.~Iashvilli and C.B.~Jackson and T.~Junk and S.-W.~Lee and H.E.~Logan and F.~Maltoni and B.~Mellado and S.~Moretti and S.~Mrenna and P.M.~Nadolsky and F.I.~Olness and W.~Quayle and J.~Rathsman and L.~Reina and E.H.~Simmons and A.~Sopczak and A.~Vicini and D.~Wackeroth and C.E.M.~Wagner and G.~Weiglein and G.~Weiglein and S.~Willenbrock and S.L.~Wu and C.P.~Yuan}, title = {{T}evatron-for-{LHC} {R}eport: {H}iggs}, year = {2006}, eprint = {hep-ph/0612172}, note = {arXiv:hep-ph/0612172v2} }
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The search for Higgs bosons in both the standard model and its extensions is well under way at the Tevatron. As the integrated luminosity collected increases into the multiple inverse femptobarn range, these searches are becoming very interesting indeed. Meanwhile, the construction of the Large Hadron Collider (LHC) and its associated experiments at CERN are nearing completion. In this TeV4LHC workshop, it was realized that any experience at the Tevatron with respect to backgrounds, experimental techniques and theoretical calculations that can be verified at the Tevatron which have relevance for future measurements at the LHC were important. Studies and contributions to these efforts were made in three broad categories: theoretical calculations of Higgs production and decay mechanisms; theoretical calculations and discussions pertaining to non-standard model Higgs bosons; and experimental reviews, analyses and developments at both the Tevatron and the upcoming LHC experiments. All of these contributions represent real progress towards the elucidation of the mechanism of electroweak symmetry breaking.
QCD Corrections to Higgs Pair Production in Bottom Quark Fusion
Sally Dawson, Chung Kao, Yili Wang, Peter Williams
Oct 24 2006 hep-ph arXiv:hep-ph/0610284v1

@misc{hep-ph/0610284, author = {Sally Dawson and Chung Kao and Yili Wang and Peter Williams}, title = {{QCD} {C}orrections to {H}iggs {P}air {P}roduction in {B}ottom {Q}uark {F}usion}, year = {2006}, eprint = {hep-ph/0610284}, howpublished = {Phys.Rev.D75:013007,2007}, doi = {10.1103/PhysRevD.75.013007}, note = {arXiv:hep-ph/0610284v1} }
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We present a complete next-to-leading order (NLO) calculation for the total cross section of inclusive Higgs pair production via bottom-quark fusion ($b\bar{b} \to hh$) at the CERN Large Hadron Collider (LHC) in the Standard Model. The NLO QCD corrections lead to less dependence on the renormalization scale ($\mu_R$) and the factorization scale ($\mu_F$) than the leading-order (LO) cross section, and they significantly increase the LO cross section. The rate for inclusive Higgs pair production is small in the Standard Model, but can be large in models with enhanced couplings of the $b$ quark to the Higgs bosons.
Higgs Triplets and Limits from Precision Measurements
Mu-Chun Chen, Sally Dawson, Tadas Krupovnickas
Apr 13 2006 hep-ph arXiv:hep-ph/0604102v2

@misc{hep-ph/0604102, author = {Mu-Chun Chen and Sally Dawson and Tadas Krupovnickas}, title = {{H}iggs {T}riplets and {L}imits from {P}recision {M}easurements}, year = {2006}, eprint = {hep-ph/0604102}, howpublished = {Phys.Rev.D74:035001,2006}, doi = {10.1103/PhysRevD.74.035001}, note = {arXiv:hep-ph/0604102v2} }
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In this letter, we present our results on a global fit to precision electroweak data in a Higgs triplet model. In models with a triplet Higgs boson, a consistent renormalization scheme differs from that of the Standard Model and the global fit shows that a light Higgs boson with mass of 100-200 GeV is preferred. Triplet Higgs bosons arise in many extensions of the Standard Model, including the left-right model and the Little Higgs models. Our result demonstrates the importance of the scalar loops when there is a large mass splitting between the heavy scalars. It also indicates the significance of the global fit.
Hadronic Higgs Production with Heavy Quarks at the Tevatron and the LHC
S. Dawson, C.B. Jackson, L. Reina, D. Wackeroth
Mar 16 2006 hep-ph arXiv:hep-ph/0603112v1

@misc{hep-ph/0603112, author = {S.~Dawson and C.B.~Jackson and L.~Reina and D.~Wackeroth}, title = {{H}adronic {H}iggs {P}roduction with {H}eavy {Q}uarks at the {T}evatron and the {LHC}}, year = {2006}, eprint = {hep-ph/0603112}, note = {arXiv:hep-ph/0603112v1} }
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We review the status of the QCD corrected cross sections and kinematic distributions for the production of a Higgs boson in association with top quark or bottom quark pairs at the Fermilab Tevatron and at the LHC. Results for b-bbar-H production are presented in the Minimal Supersymmetric Model, where the rates can be greatly enhanced relative to the Standard Model rates. We place particular emphasis on theoretical uncertainties due to renormalization and factorization scale dependence and on the uncertainties coming from the Parton Distribution Functions.
Electroweak Symmetry Breaking Circa 2005
S. Dawson
Oct 31 2005 hep-ph arXiv:hep-ph/0510385v1

@misc{hep-ph/0510385, author = {S.~Dawson}, title = {{E}lectroweak {S}ymmetry {B}reaking {C}irca 2005}, year = {2005}, eprint = {hep-ph/0510385}, howpublished = {Int.J.Mod.Phys. A21 (2006) 1629-1641}, doi = {10.1142/S0217751X06032630}, note = {arXiv:hep-ph/0510385v1} }
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Recent progress in both the theoretical and experimental explorations of electroweak symmetry breaking is surveyed.
Higgs Production in Association with Bottom Quarks at Hadron Colliders
S. Dawson, C.B. Jackson, L. Reina, D. Wackeroth
Aug 30 2005 hep-ph arXiv:hep-ph/0508293v1

@misc{hep-ph/0508293, author = {S.~Dawson and C.B.~Jackson and L.~Reina and D.~Wackeroth}, title = {{H}iggs {P}roduction in {A}ssociation with {B}ottom {Q}uarks at {H}adron {C}olliders}, year = {2005}, eprint = {hep-ph/0508293}, howpublished = {Mod.Phys.Lett. A21 (2006) 89-110}, doi = {10.1142/S0217732306019256}, note = {arXiv:hep-ph/0508293v1} }
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We review the present status of the QCD corrected cross sections and kinematic distributions for the production of a Higgs boson in association with bottom quarks at the Fermilab Tevatron and CERN Large Hadron Collider. Results are presented for the Minimal Supersymmetric Standard Model where, for large tan beta, these production modes can be greatly enhanced compared to the Standard Model case. The next-to-leading order QCD results are much less sensitive to the renormalization and factorization scales than the lowest order results, but have a significant dependence on the choice of the renormalization scheme for the bottom quark Yukawa coupling. We also investigate the uncertainties coming from the Parton Distribution Functions and find that these uncertainties can be comparable to the uncertainties from the remaining scale dependence of the next-to-leading order results. We present results separately for the different final states depending on the number of bottom quarks identified.
Constraining New Models with Precision Electroweak Data
Mu-Chun Chen, Sally Dawson, Tadas Krupovnickas
May 02 2005 hep-ph arXiv:hep-ph/0504286v3

@misc{hep-ph/0504286, author = {Mu-Chun Chen and Sally Dawson and Tadas Krupovnickas}, title = {{C}onstraining {N}ew {M}odels with {P}recision {E}lectroweak {D}ata}, year = {2005}, eprint = {hep-ph/0504286}, howpublished = {Int.J.Mod.Phys. A21 (2006) 4045-4070}, doi = {10.1142/S0217751X0603388X}, note = {arXiv:hep-ph/0504286v3} }
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Electroweak precision data have been extensively used to constrain models containing physics beyond that of the Standard Model. When the model contains Higgs scalars in representations other than singlets or doublets, and hence rho not equal to 1 at tree level, a correct renormalization scheme requires more inputs than the three commonly used for the Standard Model case. In such cases, the one loop electroweak results cannot be split into a Standard Model contribution plus a piece which vanishes as the scale of new physics becomes much larger than M_W. We illustrate our results by presenting the dependence of M_W on the top quark mass in a model with a Higgs triplet and in the SU(2)_L x SU(2)_R left-right symmetric model. In these models, the allowed range for the lightest neutral Higgs mass can be as large as a few TeV.
Perspectives on the Standard Model
S. Dawson
Nov 23 2004 hep-ph arXiv:hep-ph/0411276v1

@misc{hep-ph/0411276, author = {S.~Dawson}, title = {{P}erspectives on the {S}tandard {M}odel}, year = {2004}, eprint = {hep-ph/0411276}, doi = {10.1063/1.1896686}, note = {arXiv:hep-ph/0411276v1} }
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We discuss recent results from global electroweak fits and from the Tevatron and review the motivation for physics at the TeV energy scale.
Physics Interplay of the LHC and the ILC
LHC/LC Study Group, G. Weiglein, T. Barklow, E. Boos, A. De Roeck, K. Desch, F. Gianotti, R. Godbole, J.F. Gunion, H.E. Haber, S. Heinemeyer, J.L. Hewett, K. Kawagoe, K. Monig, M.M. Nojiri, G. Polesello, F. Richard, S. Riemann, W.J. Stirling, A.G. Akeroyd, et al (103)
Oct 28 2004 hep-ph arXiv:hep-ph/0410364v1

@misc{hep-ph/0410364, author = {LHC/LC Study Group and G.~Weiglein and T.~Barklow and E.~Boos and A.~De Roeck and K.~Desch and F.~Gianotti and R.~Godbole and J.F.~Gunion and H.E.~Haber and S.~Heinemeyer and J.L.~Hewett and K.~Kawagoe and K.~Monig and M.M.~Nojiri and G.~Polesello and F.~Richard and S.~Riemann and W.J.~Stirling and A.G.~Akeroyd and B.C.~Allanach and D.~Asner and S.~Asztalos and H.~Baer and M.~Battaglia and U.~Baur and P.~Bechtle and G.~Belanger and A.~Belyaev and E.L.~Berger and T.~Binoth and G.A.~Blair and S.~Boogert and F.~Boudjema and D.~Bourilkov and W.~Buchmuller and V.~Bunichev and G.~Cerminara and M.~Chiorboli and H.~Davoudiasl and S.~Dawson and S.~De Curtis and F.~Deppisch and M.A.~Diaz and M.~Dittmar and A.~Djouadi and D.~Dominici and U.~Ellwanger and J.L.~Feng and I.F.~Ginzburg and A.~Giolo-Nicollerat and B.K.~Gjelsten and S.~Godfrey and D.~Grellscheid and J.~Gronberg and E.~Gross and J.~Guasch and K.~Hamaguchi and T.~Han and J.~Hisano and W.~Hollik and C.~Hugonie and T.~Hurth and J.~Jiang and A.~Juste and J.~Kalinowski and W.~Kilian and R.~Kinnunen and S.~Kraml and M.~Krawczyk and A.~Krokhotine and T.~Krupovnickas and R.~Lafaye and S.~Lehti and H.E.~Logan and E.~Lytken and V.~Martin and H.-U.~Martyn and D.J.~Miller and S.~Moretti and F.~Moortgat and G.~Moortgat-Pick and M.~Muhlleitner and P.~Niezurawski and A.~Nikitenko and L.H.~Orr and P.~Osland and A.F.~Osorio and H.~Pas and T.~Plehn and W.~Porod and A.~Pukhov and F.~Quevedo and D.~Rainwater and M.~Ratz and A.~Redelbach and L.~Reina and T.~Rizzo and R.~Ruckl and H.J.~Schreiber and M.~Schumacher and A.~Sherstnev and S.~Slabospitsky and J.~Sola and A.~Sopczak and M.~Spira and M.~Spiropulu and Z.~Sullivan and M.~Szleper and T.M.P.~Tait and X.~Tata and D.R.~Tovey and A.~Tricomi and M.~Velasco and D.~Wackeroth and C.E.M.~Wagner and S.~Weinzierl and P.~Wienemann and T.~Yanagida and A.F.~Zarnecki and D.~Zerwas and P.M.~Zerwas and L.~Zivkovic}, title = {{P}hysics {I}nterplay of the {LHC} and the {ILC}}, year = {2004}, eprint = {hep-ph/0410364}, howpublished = {Phys.Rept.426:47-358,2006}, doi = {10.1016/j.physrep.2005.12.003}, note = {arXiv:hep-ph/0410364v1} }
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Physics at the Large Hadron Collider (LHC) and the International e+e- Linear Collider (ILC) will be complementary in many respects, as has been demonstrated at previous generations of hadron and lepton colliders. This report addresses the possible interplay between the LHC and ILC in testing the Standard Model and in discovering and determining the origin of new physics. Mutual benefits for the physics programme at both machines can occur both at the level of a combined interpretation of Hadron Collider and Linear Collider data and at the level of combined analyses of the data, where results obtained at one machine can directly influence the way analyses are carried out at the other machine. Topics under study comprise the physics of weak and strong electroweak symmetry breaking, supersymmetric models, new gauge theories, models with extra dimensions, and electroweak and QCD precision physics. The status of the work that has been carried out within the LHC / LC Study Group so far is summarised in this report. Possible topics for future studies are outlined.
Higgs Boson Production with Bottom Quarks at Hadron Colliders
S. Dawson, C.B. Jackson, L. Reina, D. Wackeroth
Sep 30 2004 hep-ph arXiv:hep-ph/0409345v1

@misc{hep-ph/0409345, author = {S.~Dawson and C.B.~Jackson and L.~Reina and D.~Wackeroth}, title = {{H}iggs {B}oson {P}roduction with {B}ottom {Q}uarks at {H}adron {C}olliders}, year = {2004}, eprint = {hep-ph/0409345}, howpublished = {Int.J.Mod.Phys. A20 (2005) 3353-3355}, doi = {10.1142/S0217751X05026558}, note = {arXiv:hep-ph/0409345v1} }
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We present results for the production cross section of a Higgs Boson with a pair of bottom/anti-bottom quarks, including next-to-leading order (NLO) QCD corrections.
The Littlest Higgs Model and One-Loop Electroweak Precision Constraints
Mu-Chun Chen, Sally Dawson
Sep 15 2004 hep-ph arXiv:hep-ph/0409163v1

@misc{hep-ph/0409163, author = {Mu-Chun Chen and Sally Dawson}, title = {{T}he {L}ittlest {H}iggs {M}odel and {O}ne-{L}oop {E}lectroweak {P}recision {C}onstraints}, year = {2004}, eprint = {hep-ph/0409163}, howpublished = {Tsukuba 2004, Supersymmetry and Unification of Fundamental Interactions, 921-924.}, note = {arXiv:hep-ph/0409163v1} }
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We present in this talk the one-loop electroweak precision constraints in the Littlest Higgs model, including the logarithmically enhanced contributions from both fermion and scalar loops. We find the one-loop contributions are comparable to the tree level corrections in some regions of parameter space. A low cutoff scale is allowed for a non-zero triplet VEV. Constraints on various other parameters in the model are also discussed. The role of triplet scalars in constructing a consistent renormalization scheme is emphasized.
Higgs boson production with one bottom quark jet at hadron colliders
S. Dawson, C.B. Jackson, L. Reina, D. Wackeroth
Aug 06 2004 hep-ph arXiv:hep-ph/0408077v1

@misc{hep-ph/0408077, author = {S.~Dawson and C.B.~Jackson and L.~Reina and D.~Wackeroth}, title = {{H}iggs boson production with one bottom quark jet at hadron colliders}, year = {2004}, eprint = {hep-ph/0408077}, howpublished = {Phys.Rev.Lett. 94 (2005) 031802}, doi = {10.1103/PhysRevLett.94.031802}, note = {arXiv:hep-ph/0408077v1} }
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We present total rates and kinematic distributions for the associated production of a single bottom quark and a Higgs boson at the Tevatron and the LHC. We include next-to-leading order QCD corrections and compare the results obtained in the four and five flavor number schemes for parton distribution functions.
The Higgs Working Group: Summary Report 2003
K.A.Assamagan, M.Narain, A.Nikitenko, M.Spira, D.Zeppenfeld, J.Alwall, C.Balázs, T.Barklow, U.Baur, C.Biscarat, M.Bisset, E.Boos, G.Bozzi, O.Brein, J.Campbell, S.Catani, M.Ciccolini, K.Cranmer, A.Dahlhoff, S.Dawson, et al (64)
Jun 15 2004 hep-ph arXiv:hep-ph/0406152v1

@misc{hep-ph/0406152, author = {K.A.Assamagan and M.Narain and A.Nikitenko and M.Spira and D.Zeppenfeld and J.Alwall and C.Balázs and T.Barklow and U.Baur and C.Biscarat and M.Bisset and E.Boos and G.Bozzi and O.Brein and J.Campbell and S.Catani and M.Ciccolini and K.Cranmer and A.Dahlhoff and S.Dawson and D.de Florian and A.De Roeck and V.Del Duca and S.Dittmaier and A.Djouadi and V.Drollinger and L.Dudko and M.Dührssen and U.Ellwanger and M.Escalier and Y.Q.Fang and S.Ferrag and J.R.Forshaw and M.Grazzini and J.Guasch and M.Guchait and J.F.Gunion and T.Hahn and R.Harlander and H.-J.He and S.Heinemeyer and J.Heyninck and W.Hollik and C.Hugonie and C.Jackson and N.Kauer and N.Kersting and V.Khoze and N.Kidonakis and R.Kinnunen and M.Krämer and Y.-P.Kuang and B.Laforge and S.Lehti and M.Lethuillier and J.Li and H.Logan and S.Lowette and F.Maltoni and R.Mazini and B.Mellado and F.Moortgat and S.Moretti and Z.Nagy and P.Nason and C.Oleari and S.Paganis and S.Penaranda and T.Plehn and W.Quayle and D.Rainwater and J.Rathsman and O.Ravat and L.Reina and A.Sabio Vera and A.Sopczak and Z.Trócsányi and P.Vanlaer and D.Wackeroth and G.Weiglein and S.Willenbrock and Sau Lan Wu and C.-P.Yuan and B.Zhang}, title = {{T}he {H}iggs {W}orking {G}roup: {S}ummary {R}eport 2003}, year = {2004}, eprint = {hep-ph/0406152}, note = {arXiv:hep-ph/0406152v1} }
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Theoretical progress in Higgs boson production and background processes is discussed with particular emphasis on QCD corrections at and beyond next-to-leading order as well as next-to-leading order electroweak corrections. The residual theoretical uncertainties of the investigated processes are estimated in detail. Moreover, recent investigations of the MSSM Higgs sector and other extensions of the SM Higgs sector are presented. The potential of the LHC and a high-energy linear e+e- collider for the measurement of Higgs couplings is analyzed.
Higgs Boson Production in Association with Bottom Quarks
J. Campbell, S. Dawson, S. Dittmaier, C. Jackson, M. Kramer, F. Maltoni, L. Reina, M. Spira, D. Wackeroth, S. Willenbrock
Jun 01 2004 hep-ph arXiv:hep-ph/0405302v1

@misc{hep-ph/0405302, author = {J.~Campbell and S.~Dawson and S.~Dittmaier and C.~Jackson and M.~Kramer and F.~Maltoni and L.~Reina and M.~Spira and D.~Wackeroth and S.~Willenbrock}, title = {{H}iggs {B}oson {P}roduction in {A}ssociation with {B}ottom {Q}uarks}, year = {2004}, eprint = {hep-ph/0405302}, note = {arXiv:hep-ph/0405302v1} }
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In the Standard Model, the coupling of the Higgs boson to b quarks is weak, leading to small cross sections for producing a Higgs boson in association with b quarks. However, Higgs bosons with enhanced couplings to b quarks, such as occur in supersymmetric models for large values of tan beta, will be copiously produced at both the Tevatron and the LHC in association with b quarks, which will be an important discovery channel. We investigate the connections between the production channels, bg -> bh and gg ->b bbar h, at next-to-leading order (NLO) in perturbative QCD and present results for the cases with two high p_T b jets and with one high p_T b jet at both the Tevatron the the LHC. Finally, the total cross sections without cuts are compared between gg -> b bbar h at NLO and b bbar ->h at NNLO.
Physics Opportunities with a TeV Linear Collider
Sally Dawson, Mark Oreglia
Mar 02 2004 hep-ph hep-ex arXiv:hep-ph/0403015v1

@misc{hep-ph/0403015, author = {Sally Dawson and Mark Oreglia}, title = {{P}hysics {O}pportunities with a {T}e{V} {L}inear {C}ollider}, year = {2004}, eprint = {hep-ph/0403015}, howpublished = {Ann.Rev.Nucl.Part.Sci. 54 (2004) 269-314}, doi = {10.1146/annurev.nucl.54.070103.181259}, note = {arXiv:hep-ph/0403015v1} }
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We discuss the physics motivations for building a 500 - 1 TeV electron-positron linear collider. The state of the art collider technologies and the physics-driven machine parameters are discussed. A survey of some of the phenomena well suited to study at a linear collider are described, including Higgs bosons, supersymmetry, other extensions to the Standard Model, and cosmology.
Discovering the Higgs Bosons of Minimal Supersymmetry with Muons and a Bottom Quark
S. Dawson, D. Dicus, C. Kao, R. Malhotra
Feb 18 2004 hep-ph arXiv:hep-ph/0402172v3

@misc{hep-ph/0402172, author = {S.~Dawson and D.~Dicus and C.~Kao and R.~Malhotra}, title = {{D}iscovering the {H}iggs {B}osons of {M}inimal {S}upersymmetry with {M}uons and a {B}ottom {Q}uark}, year = {2004}, eprint = {hep-ph/0402172}, howpublished = {Phys.Rev.Lett. 92 (2004) 241801}, doi = {10.1103/PhysRevLett.92.241801}, note = {arXiv:hep-ph/0402172v3} }
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We investigate the prospects for the discovery at the CERN Large Hadron Collider of a neutral Higgs boson produced with one bottom quark followed by Higgs decay into a muon pair. We work within the framework of the minimal supersymmetric model. The dominant physics background from the production of $b \mu^+\mu^-$, $j\mu^+\mu^-$, j=g,u,d,s,c, and $b {\bar b} W^+W^-$ is calculated with realistic acceptance cuts. Promising results are found for the CP-odd pseudoscalar ($A^0$) and the heavier CP-even scalar ($H^0$) Higgs bosons with masses up to 600 GeV. This discovery channel with one energetic bottom quark greatly improves the discovery potential of the LHC beyond the inclusive channel $pp\to \phi^0\to \mu^+\mu^- +X$.
Theoretical progress for the associated production of a Higgs boson with heavy quarks at hadron colliders
S. Dawson, C.B. Jackson, L.H. Orr, L. Reina, D. Wackeroth
Nov 18 2003 hep-ph arXiv:hep-ph/0311216v1

@misc{hep-ph/0311216, author = {S.~Dawson and C.B.~Jackson and L.H.~Orr and L.~Reina and D.~Wackeroth}, title = {{T}heoretical progress for the associated production of a {H}iggs boson with heavy quarks at hadron colliders}, year = {2003}, eprint = {hep-ph/0311216}, howpublished = {Eur.Phys.J.C33:s451-s453,2004}, doi = {10.1140/epjcd/s2003-03-425-5}, note = {arXiv:hep-ph/0311216v1} }
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The production of a Higgs boson in association with a pair of top-antitop or bottom-antibottom quarks plays a very important role at both the Tevatron and the Large Hadron Collider. The theoretical prediction of the corresponding cross sections has been improved by including the complete next-to-leading order QCD corrections. After a brief introduction, we review the results obtained for both the Tevatron and the Large Hadron Collider.
Scalar and Pseudoscalar Higgs Boson Plus One Jet Production at the LHC and Tevatron
B. Field, S. Dawson, J. Smith
Nov 17 2003 hep-ph arXiv:hep-ph/0311199v2

@misc{hep-ph/0311199, author = {B.~Field and S.~Dawson and J.~Smith}, title = {{S}calar and {P}seudoscalar {H}iggs {B}oson {P}lus {O}ne {J}et {P}roduction at the {LHC} and {T}evatron}, year = {2003}, eprint = {hep-ph/0311199}, howpublished = {Phys.Rev.D69:074013,2004}, doi = {10.1103/PhysRevD.69.074013}, note = {arXiv:hep-ph/0311199v2} }
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The production of the Standard Model (SM) Higgs boson (H) in association with a jet is compared with that of the lightest scalar Higgs boson (h^0) and the pseudoscalar Higgs boson (A^0) of the Minimal Supersymmetric Model (MSSM) at both the CERN Large Hadron Collider (LHC) and the Fermilab Tevatron. We include both top and bottom quark loops to lowest order in QCD and investigate the limits of zero quark mass and infinite quark mass.
NLO QCD corrections to hadronic Higgs production with heavy quarks
S. Dawson, C.B. Jackson, L.H. Orr, L. Reina, D. Wackeroth
Nov 11 2003 hep-ph arXiv:hep-ph/0311105v1

@misc{hep-ph/0311105, author = {S.~Dawson and C.B.~Jackson and L.H.~Orr and L.~Reina and D.~Wackeroth}, title = {{NLO} {QCD} corrections to hadronic {H}iggs production with heavy quarks}, year = {2003}, eprint = {hep-ph/0311105}, doi = {10.1016/j.nuclphysbps.2004.04.146}, note = {arXiv:hep-ph/0311105v1} }
PDF
The production of a Higgs boson in association with a pair of top-antitop or bottom-antibottom quarks plays a very important role at both the Tevatron and the Large Hadron Collider. The theoretical prediction of the corresponding cross sections has been improved by including the complete next-to-leading order QCD corrections. After a brief description of the most relevant technical aspects of the calculation, we review the results obtained for both the Tevatron and the Large Hadron Collider
Exclusive Higgs Boson Production with bottom quarks at Hadron Colliders
S. Dawson, C.B. Jackson, L. Reina, D. Wackeroth
Nov 06 2003 hep-ph arXiv:hep-ph/0311067v1

@misc{hep-ph/0311067, author = {S.~Dawson and C.B.~Jackson and L.~Reina and D.~Wackeroth}, title = {{E}xclusive {H}iggs {B}oson {P}roduction with bottom quarks at {H}adron {C}olliders}, year = {2003}, eprint = {hep-ph/0311067}, howpublished = {Phys.Rev.D69:074027,2004}, doi = {10.1103/PhysRevD.69.074027}, note = {arXiv:hep-ph/0311067v1} }
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We present the next-to-leading order QCD corrected rate for the production of a scalar Higgs boson with a pair of high p_T bottom and anti-bottom quarks at the Tevatron and at the Large Hadron Collider. Results are given for both the Standard Model and the Minimal Supersymmetric Standard Model. The exclusive b-bbar-h production rate is small in the Standard Model, but it can be greatly enhanced in the Minimal Supersymmetric Standard Model for large tan(beta), making b-bbar-h an important discovery mode. We find that the next-to-leading order QCD results are much less sensitive to the renormalization and factorization scales than the lowest order results, but have a significant dependence on the choice of the renormalization scheme for the bottom quark Yukawa coupling.
One-loop Radiative Corrections to the rho Parameter in the Littlest Higgs Model
Mu-Chun Chen, Sally Dawson
Nov 05 2003 hep-ph arXiv:hep-ph/0311032v3

@misc{hep-ph/0311032, author = {Mu-Chun Chen and Sally Dawson}, title = {{O}ne-loop {R}adiative {C}orrections to the rho {P}arameter in the {L}ittlest {H}iggs {M}odel}, year = {2003}, eprint = {hep-ph/0311032}, howpublished = {Phys.Rev.D70:015003,2004}, doi = {10.1103/PhysRevD.70.015003}, note = {arXiv:hep-ph/0311032v3} }
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We perform a one-loop analysis of the rho parameter in the Littlest Higgs model, including the logarithmically enhanced contributions from both fermion and scalar loops. We find the one-loop contributions are comparable to the tree level corrections in some regions of parameter space. The fermion loop contribution dominates in the low cutoff scale f region. On the other hand, the scalar loop contribution dominates in the high cutoff scale f region and it grows with the cutoff scale f. This in turn implies an upper bound on the cutoff scale. A low cutoff scale is allowed for a non-zero triplet VEV. Constraints on various other parameters in the model are also discussed. The role of triplet scalars in constructing a consistent renormalization scheme is emphasized.
Associated Higgs boson production with heavy quarks
S. Dawson, L.H. Orr, L.Reina, D.Wackeroth
May 27 2003 hep-ph arXiv:hep-ph/0305282v1

@misc{hep-ph/0305282, author = {S.~Dawson and L.H.~Orr and L.Reina and D.Wackeroth}, title = {{A}ssociated {H}iggs boson production with heavy quarks}, year = {2003}, eprint = {hep-ph/0305282}, note = {arXiv:hep-ph/0305282v1} }
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The production of a Higgs boson in association with a pair of t-tbar quarks will play a very important role at both hadron and lepton colliders. We review the status of theoretical predictions and their relevance to Higgs boson studies, with particular emphasis on the recently calculated NLO QCD corrections to the inclusive cross section for p-pbar,pp -> t-tbar-h. We conclude by briefly discussing the case of exclusive b-bbar-h production and the potential of this process in revealing signals of new physics beyond the Standard Model.
Associated Higgs production with top quarks at the Large Hadron Collider: NLO QCD corrections
S. Dawson, C. Jackson, L.H. Orr, L. Reina, D. Wackeroth
May 09 2003 hep-ph arXiv:hep-ph/0305087v2

@misc{hep-ph/0305087, author = {S.~Dawson and C.~Jackson and L.H.~Orr and L.~Reina and D.~Wackeroth}, title = {{A}ssociated {H}iggs production with top quarks at the {L}arge {H}adron {C}ollider: {NLO} {QCD} corrections}, year = {2003}, eprint = {hep-ph/0305087}, howpublished = {Phys.Rev.D68:034022,2003}, doi = {10.1103/PhysRevD.68.034022}, note = {arXiv:hep-ph/0305087v2} }
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We present in detail the calculation of the O(alpha_s^3) inclusive total cross section for the process pp -> t-tbar-h, in the Standard Model, at the CERN Large Hadron Collider with center-of-mass energy sqrt(s_H)=14 TeV. The calculation is based on the complete set of virtual and real O(alpha_s) corrections to the parton level processes q-qbar -> t-tbar-h and gg -> t-tbar-h, as well as the tree level processes (q,qbar)g -> t-tbar-h-(q,qbar). The virtual corrections involve the computation of pentagon diagrams with several internal and external massive particles, first encountered in this process. The real corrections are computed using both the single and the two cutoff phase space slicing method. The next-to-leading order QCD corrections significantly reduce the renormalization and factorization scale dependence of the Born cross section and moderately increase the Born cross section for values of the renormalization and factorization scales above m_t.
The Top Quark, QCD, and New Physics
S. Dawson
Mar 24 2003 hep-ph arXiv:hep-ph/0303191v2

@misc{hep-ph/0303191, author = {S.~Dawson}, title = {{T}he {T}op {Q}uark, {QCD}, and {N}ew {P}hysics}, year = {2003}, eprint = {hep-ph/0303191}, note = {arXiv:hep-ph/0303191v2} }
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The role of the top quark in completing the Standard Model quark sector is reviewed, along with a discussion of production, decay, and theoretical restrictions on the top quark properties. Particular attention is paid to the top quark as a laboratory for perturbative QCD. As examples of the relevance of QCD corrections in the top quark sector, the calculation of $e^+e^-\to t {\bar t}$ at next-to-leading-order QCD using the phase space slicing algorithm and the implications of a precision measurement of the top quark mass are discussed in detail. The associated production of a $t {\bar t}$ pair and a Higgs boson in either $e^+e^-$ or hadronic collisions is presented at next-to-leading-order QCD and its importance for a measurement of the top quark Yukawa coupling emphasized. Implications of the heavy top quark mass for model builders are briefly examined, with the minimal supersymmetric Standard Model and topcolor discussed as specific examples.
Associated Top Quark-Higgs Boson Production at the LHC
S. Dawson, L.H. Orr, L. Reina, D. Wackeroth
Nov 29 2002 hep-ph arXiv:hep-ph/0211438v1

@misc{hep-ph/0211438, author = {S.~Dawson and L.H.~Orr and L.~Reina and D.~Wackeroth}, title = {{A}ssociated {T}op {Q}uark-{H}iggs {B}oson {P}roduction at the {LHC}}, year = {2002}, eprint = {hep-ph/0211438}, howpublished = {Phys.Rev.D67:071503,2003}, doi = {10.1103/PhysRevD.67.071503}, note = {arXiv:hep-ph/0211438v1} }
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We compute the O(alpha_s^3) inclusive cross section for the process pp -> t-tbar-h in the Standard Model, at sqrt(s)=14 TeV. The next-to-leading order corrections drastically reduce the renormalization and factorization scale dependence of the Born cross section and increase the total cross section for renormalization and factorization scales larger than m_t. These corrections have important implications for models of new physics involving the top quark.
NLO QCD Predictions for associated t-tbar-h production in Hadronic Collisions
S. Dawson, L.H. Orr, L. Reina, D. Wackeroth
Nov 26 2002 hep-ph arXiv:hep-ph/0211373v1

@misc{hep-ph/0211373, author = {S.~Dawson and L.H.~Orr and L.~Reina and D.~Wackeroth}, title = {{NLO} {QCD} {P}redictions for associated t-tbar-h production in {H}adronic {C}ollisions}, year = {2002}, eprint = {hep-ph/0211373}, howpublished = {Nucl.Phys.Proc.Suppl. 116 (2003) 207}, doi = {10.1016/S0920-5632(03)80171-8}, note = {arXiv:hep-ph/0211373v1} }
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We present the next-to-leading-order (NLO) QCD corrections to the inclusive total cross section for the production of a Higgs boson in association with a top anti-top quark pair within the Standard Model at the Tevatron and the LHC.

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