14 research outputs found
Top- and bottom-mass effects in hadronic Higgs production at small transverse momenta through LO+NLL
The resummed transverse momentum distribution of the Higgs boson in gluon
fusion through LO+NLL for small transverse momenta is considered, where the
Higgs is produced through a top- and bottom-quark loop. We study the mass
effects with respect to the infinite top-mass approach. The top-mass effects
are small and the heavy-top limit is valid to better than 4% as long as the
Higgs' transverse momentum stays below 150 GeV. When the bottom loop is
considered as well, the discrepancy reaches up to about 10%. We conclude that
bottom-mass effects cannot be included in a reasonable manner by a naive
reweighting procedure in the heavy-top limit. We compare our results to an
earlier, alternative approach based on POWHEG.Comment: 20 pages, 8 figure
Transverse momentum resummation for Higgs production via gluon fusion in the MSSM
The resummed transverse momentum distribution of supersymmetric Higgs bosons
produced through gluon fusion at NLO+NLL is presented, including the exact
quark and squark mass dependences. Considering various MSSM scenarios, we
compare our results to previous ones within the POWHEG approach. We analyze the
impact of the bottom loop which becomes the dominant contribution to the gluon
fusion cross section for a wide range of the parameter space for the
pseudo-scalar and heavy Higgs.Comment: 33 pages, 13 figure
Higgs production in gluon fusion at next-to-next-to-leading order QCD for finite top mass
The inclusive Higgs production cross section from gluon fusion is calculated
through NNLO QCD, including its top quark mass dependence. This is achieved
through a matching of the 1/mtop expansion of the partonic cross sections to
the exact large s-hat limits which are derived from k_T-factorization. The
accuracy of this procedure is estimated to be better than 1% for the hadronic
cross section. The final result is shown to be within 1% of the commonly used
effective theory approach, thus confirming earlier findings.Comment: 28 pages, 14 figure
Hadronic Higgs production through NLO
The next-to-leading order (NLO) cross section of the gluon fusion process is matched to parton showers in the MC@NLO approach. We work in the framework of MadGraph5_aMC@NLO and document the inclusion of the full quark-mass dependence in the Standard Model (SM) as well as the state-of-the-art squark and gluino effects within the Minimal Supersymmetric SM embodied in the program SusHi. The combination of the two programs is realized by a script which is publicly available and whose usage is detailed. We discuss the input cards and the relevant parameter switches. One of our focuses is on the shower scale which is specifically important for gluon-induced Higgs production, particularly in models with enhanced Higgs-bottom Yukawa coupling