Higgs production via gluon fusion in the POWHEG approach in the SM and in the MSSM

Abstract

Abstract:We consider the gluon fusion production cross section of a scalar Higgs boson at NLO QCD in the SM and in the MSSM. We implement the calculation in the POWHEG approach, and match the NLO-QCD results with the PYTHIA and HERWIG QCD parton showers. We discuss a few representative scenarios in the SM and MSSM parameter spaces, with emphasis on the fermion and squark mass effects on the Higgs boson distributions.

Observation and measurement of Higgs boson decays toWW*with the ATLAS detector

“…The ggF and VBF production modes for the H → WW Ã signal are modeled with POWHEG þ PYTHIA8 [49,50] at m H ¼ 125 GeV, and the corresponding cross sections are shown in Table III. A detailed description of these processes and their modeling uncertainties is given in Sec.…”

“…Uncertainties on the perturbative calculations of the total production cross section and of the cross sections exclusive in jet multiplicity are among the leading uncertainties on the expected signal event yield and the extracted couplings. The POWHEG [49] generator matched to PYTHIA8 is used for event simulation and accurately models the exclusive jet multiplicities relevant to this analysis. The simulation is corrected to match higherorder calculations of the Higgs boson p T distribution.…”

“…The POWHEG MC generator used to model ggF production [49] is based on an NLO calculation with finite quark masses and a running-width Breit-Wigner distribution that includes electroweak corrections at next-toleading order [75]. The generator contains a scale for matching the resummation to the matrix-element calculation, which is chosen to reproduce the NNLO þ NLL calculation of the Higgs boson p T [76].…”

Limits on the Higgs boson lifetime and width from its decay to four charged leptons

“…Therefore, different techniques and tools have been used for on-shell and off-shell simulation. The simulation of the H boson signal is performed at the measured value of the H boson pole mass m H ¼ 125.6 GeV in the 4l The two dominant H boson production mechanisms, gluon fusion and VBF, are generated on-shell at next-toleading order (NLO) in perturbative quantum chromodynamics (QCD) using the POWHEG [32][33][34] [35][36][37]. In addition, gluon fusion production with up to two jets at NLO in QCD has been generated using POWHEG with the HJJ program [38], where the MINLO procedure [39] is used to resum all large logarithms associated with the presence of a scale for merging the matrix element and the parton shower contributions.…”

Higgs boson production in association with top quarks in the POWHEG BOX

“…Even though the background to ttH represents a major hurdle which needs to be overcome in order to properly measure this very important production channel, a very accurate control of the signal is still the first necessary step, and the possibility for the experimental community to have access to several public tools is very valuable. Our implementation answers this need and provides the original NLO-QCD analytic calculation [22][23][24][25] in the same framework (POWHEG BOX in this case) as other processes that enter the ttH studies, from tt production [41] to single-top production [42] or Higgs production in gluon-gluon fusion [43,44], offering a fully consistent alternative to analogous studies in the MadGraph5 aMC@NLO [45] and Open Loops [46] frameworks.…”