Finite top quark mass effects in NNLO Higgs boson production at LHC

Pak, Alexey; Rogal, M.; Steinhauser, Matthias

doi:10.1007/jhep02(2010)025

Cited by 191 publications

(177 citation statements)

References 44 publications

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“…At NLO, the approximation m t ≫ M H for the contribution of the top quark in the loop is rather good for Higgs masses below the tt threshold, M H < ∼ 340 GeV, in particular when the full quark mass dependence of the leading order cross section σ LO exact is taken into account [27]. At NNLO, this approximation for the top quark contribution seems also to be accurate as studies of the effect of a finite m t value in expansions of M H /(2m t ) have shown a difference below the percent level with respect to the EFT calculation for M H 300 GeV [78][79][80][81].…”

Section: The Use Of An Effective Theory Approachmentioning

confidence: 99%

Higgs production at the lHC

Baglio

Djouadi

2011

J. High Energ. Phys.

172

194

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Abstract:We analyze the production of Higgs particles at the early stage of the CERN large Hadron Collider with a 7 TeV center of mass energy (lHC). We first consider the case of the Standard Model Higgs boson that is mainly produced in the gluon-gluon fusion channel and to be detected in its decays into electroweak gauge bosons, gg → H → W W, ZZ, γγ. The production cross sections at √ s = 7 TeV and the decay branching ratios, including all relevant higher order QCD and electroweak corrections, are evaluated. An emphasis is put on the various theoretical uncertainties that affect the production rates: the significant uncertainties from scale variation and from the parametrization of the parton distribution functions as well as the uncertainties which arise due to the use of an effective field theory in the calculation of the next-to-next-to-leading order corrections. The parametric uncertainties stemming from the values of the strong coupling constant and the heavy quark masses in the Higgs decay branching ratios, which turn out to be non-negligible, are also discussed. The implications for different center of mass energies of the proton collider, √ s = 8-10 TeV as well as for the design energy √ s = 14 TeV, are briefly summarized. We then discuss the production of the neutral Higgs particles of the Minimal Supersymmetric extension of the Standard Model in the two main channels: gluon-gluon and bottom quark fusion leading to Higgs bosons which subsequently decay into tau lepton or b-quark pairs, gg, bb → Higgs → τ + τ − , bb. The Higgs production cross sections at the lHC and the decay branching ratios are analyzed. The associated theoretical uncertainties are found to be rather large and will have a significant impact on the parameter space of the model that can be probed.

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Section: The Use Of An Effective Theory Approachmentioning

confidence: 99%

Higgs production at the lHC

Baglio

Djouadi

2011

J. High Energ. Phys.

172

194

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“…in the formal limit M h → 0. For Higgs boson masses considered here this approximation approaches the exact result to high accuracy [15][16][17][18]. We have cross checked our implementation against the results implemented in [20] in certain limits.…”

Section: Numerical Setupmentioning

confidence: 85%

Supersymmetric next-to-next-to-leading order corrections to Higgs boson production in gluon fusion

Pak

Steinhauser

Zerf

2012

J. High Energ. Phys.

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We compute the total cross section for the production of a light CP even Higgs boson within the framework of supersymmetric QCD up to next-to-next-to-leading order. Technical subtleties in connection to the evaluation of three-loop Feynman integrals with many mass scales are discussed in detail and explicit results for the counterterms of the evanescent couplings are provided. The new results are applied to several phenomenological scenarios which are in accordance with the recent discovery at the LHC. In a large part of the still allowed parameter space the K factor of the supersymmetric theory is close to the one of the Standard Model. However, for the case where one of the top squarks is light, a deviation of more than 5% in the next-to-next-to-leading order prediction of the cross section can be observed where at the same time the predicted Higgs boson mass has a value of about 125 GeV.

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“…[6] we have decided to consider the forward scattering amplitudes and evaluate those imaginary parts which involve a cut of the Higgs boson line. In a first step we generate the diagrams and apply subsequently the asymptotic expansion in the limit 2 M 2 t ≫ŝ, M 2 H , implemented in two independent programs.…”

Section: Outline Of the Calculationmentioning

confidence: 99%

“…[5,7] an expansion in x = M 2 H /ŝ has been performed whereas in Ref. [6] the full x-dependence is kept. Apart from that the results of [5,7] and [6] agree.…”

Section: Outline Of the Calculationmentioning

confidence: 99%