Higgs production in heavy-quark annihilation through next-to-next-to-leading order QCD

Harlander, Robert V.

doi:10.1140/epjc/s10052-016-4093-x

Cited by 19 publications

(20 citation statements)

References 53 publications

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“…Also, at the Higgs masses of interest, the matched result is dominated by the resummation contributions and as shown in ref. [30] the 5FS tends to favor µ R values between m H /2 and m H . Finally, this choice has the convenient side effect that the NLO+NNLL partial result turns out to be a very small correction over the NLO+NLL result.…”

Section: Central Scale Choicesmentioning

confidence: 97%

“…This choice is motivated by the well-known observation that in bbH such a small factorization scale leads to an improved perturbative convergence, see e.g. [16,[27][28][29][30]. We point out that the matched NLO+NLL result turns out to be significantly less sensitive to the central value of µ For the renormalization scale we use a somewhat larger central value µ R = m H /2.…”

Section: Central Scale Choicesmentioning

confidence: 99%

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Matched predictions for the b b ¯ H $$ b\overline{b}H $$ cross section at the 13 TeV LHC

Bonvini

Papanastasiou

Tackmann

2016

J. High Energ. Phys.

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We present up-to-date matched predictions for the bbH inclusive cross section at the LHC at √ s = 13 TeV. Using a previously developed method, our predictions consistently combine the complete NLO contributions that are present in the 4-flavor scheme calculation, including finite b-quark mass effects as well as top-loop induced Y b Y t interference contributions, with the resummation of collinear logarithms of m b /m H as present in the 5-flavor scheme calculation up to NNLO. We provide a detailed estimate of the perturbative uncertainties of the matched result by examining its dependence on the factorization and renormalization scales, the scale of the Yukawa coupling, and also the low b-quark matching scale in the PDFs. We motivate the use of a central renormalization scale of m H /2, which is halfway between the values typically chosen in the 4-flavor and 5-flavor scheme calculations. We evaluate the parametric uncertainties due to the PDFs and the b-quark mass, and in particular discuss how to systematically disentangle the parametric m b dependence and the unphysical b-quark matching scale dependence. Our best prediction for the bbH production cross section in the Standard Model at 13 TeV and for m H = 125 GeV is σ(bbH) = 0.52 pb 1 ± 9.6%(perturbative) +2.9% −3.6% (parametric) . We also provide predictions for a range of Higgs masses m H ∈ [50, 750] GeV. Our method to compute the matched prediction and to evaluate its uncertainty can be readily applied to other heavy-quark-initiated processes at the LHC.

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Section: Central Scale Choicesmentioning

confidence: 97%

Section: Central Scale Choicesmentioning

confidence: 99%

Matched predictions for the b b ¯ H $$ b\overline{b}H $$ cross section at the 13 TeV LHC

Bonvini

Papanastasiou

Tackmann

2016

J. High Energ. Phys.

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“…The inclusive cross section for this process is implemented at NNLO QCD [82,83]; it is reweighted by effective Yukawa couplings in the model under consideration. SusHi 1.6.0 now also includes general heavy-quark annihilation cross sections [30] at NNLO QCD, which we will describe in Section 4.…”

Section: The Program Sushimentioning

confidence: 99%

“…[30]. Its activation is through the presence of the Block QQH in the input file, which has the following form:…”

Section: Heavy-quark Annihilationmentioning

confidence: 99%

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SusHi Bento: Beyond NNLO and the heavy- top limit

Harlander

Liebler

Mantler

2017

Computer Physics Communications

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182

170

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Version 1.6.0 of the code SusHi is presented. Concerning inclusive CP-even Higgs production in gluon fusion, the following new features with respect to previous versions have been implemented: expansion of the partonic cross section in the soft limit, i.e. around x = M 2 H /ŝ → 1; N 3 LO QCD corrections in terms of the soft expansion; top-quark mass suppressed terms through NNLO; matching to the cross section at x → 0 through N 3 LO. For CP-even and -odd scalars, an efficient evaluation of the renormalization-scale dependence is included, and effects of dimension-5 operators can be studied, which we demonstrate for the SM Higgs boson and for a CP-even scalar with a mass of 750 GeV. In addition, as a generalization of the previously available bb → H cross section, SusHi 1.6.0 provides the cross section for charged and neutral Higgs production in the annihilation of arbitrary heavy quarks. At fixed order in perturbation theory, SusHi thus allows to obtain Higgs cross-section predictions in different models to the highest precision known today. For the SM Higgs boson of M H = 125 GeV, SusHi yields 48.28 pb for the gluon-fusion cross section at the LHC at 13 TeV. Simultaneously, SusHi provides the renormalization-scale uncertainty of ±1.97 pb. Compared to version 1.0.0 the newest SusHi version 1.6.0 now supports the 2-Higgs-DoubletModel (2HDM) and the next-to-minimal supersymmetric standard model (NMSSM). The effects of dimension-5 operators in the calculation of the gluon-fusion cross section can be studied. It allows to calculate the Higgs production cross section from the annihilation of heavy quarks and includes various new features which improve the gluon-fusion cross-section prediction and the associated uncertainty estimate. Links to external codes 2HDMC, MoRe-SusHi and MadGraph5 aMC@NLO can be established. Summary of revisions:Inclusion of 2HDM, NMSSM; Improvements in the prediction of the gluon-fusion cross section: Topquark mass terms up to next-to-next-to leading order, soft expansion and next-to-next-to-next-to leading order corrections in the heavy top-quark effective theory, top squark corrections up to next-to-next-to leading order; dimension-5 operators; analytic determination of the renormalization scale dependence. Inclusion of heavy-quark annihilation cross sections. Link to MoRe-SusHi for the calculation of resummed transverse-momentum distributions. Nature of problem: Calculation of inclusive and exclusive Higgs production cross sections in gluon fusion and heavyquark annihilation in the SM and extended Higgs sectors through next-to-leading order QCD, including (next-to-)next-to-next-to-leading order top-(s)quark contributions and electroweak effects. Solution method: Numerical Monte Carlo integration. References: http://sushi.hepforge.org

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Resummation improved rapidity spectrum for gluon fusion Higgs production

Ebert

Michel

Tackmann

2017

J. High Energ. Phys.

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Gluon-induced processes such as Higgs production typically exhibit large perturbative corrections. These partially arise from large virtual corrections to the gluon form factor, which at timelike momentum transfer contains Sudakov logarithms evaluated at negative arguments ln 2 (−1) = −π 2 . It has been observed that resumming these terms in the timelike form factor leads to a much improved perturbative convergence for the total cross section. We discuss how to consistently incorporate the resummed form factor into the perturbative predictions for generic cross sections differential in the Born kinematics, including in particular the Higgs rapidity spectrum. We verify that this indeed improves the perturbative convergence, leading to smaller and more reliable perturbative uncertainties, and that this is not affected by cancellations between resummed and unresummed contributions. Combining both fixed-order and resummation uncertainties, the perturbative uncertainty for the total cross section at N 3 LO+N 3 LL ϕ is about a factor of two smaller than at N 3 LO. The perturbative uncertainty of the rapidity spectrum at NNLO+NNLL ϕ is similarly reduced compared to NNLO. We also study the analogous resummation for quark-induced processes, namely Higgs production through bottom quark annihilation and the Drell-Yan rapidity spectrum. For the former the resummation leads to a small improvement, while for the latter it confirms the already small uncertainties of the fixed-order predictions.

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Higgs production in heavy-quark annihilation through next-to-next-to-leading order QCD

Cited by 19 publications

References 53 publications

Matched predictions for the b b ¯ H $$ b\overline{b}H $$ cross section at the 13 TeV LHC

Matched predictions for the b b ¯ H $$ b\overline{b}H $$ cross section at the 13 TeV LHC

SusHi Bento: Beyond NNLO and the heavy- top limit

Resummation improved rapidity spectrum for gluon fusion Higgs production

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