Perturbative QCD effects and the search for a H->WW->l nu l nu signal at the Tevatron

Abstract

The Tevatron experiments have recently excluded a Standard Model Higgs boson in the mass range 160 - 170 GeV at the 95% confidence level. This result is based on sophisticated analyses designed to maximize the ratio of signal and background cross-sections. In this paper we study the production of a Higgs boson of mass 160 GeV in the gg -> H -> WW -> l nu l nu channel. We choose a set of cuts like those adopted in the experimental analysis and compare kinematical distributions of the final state leptons computed in NNLO QCD to lower-order calculations and to those obtained with the event generators PYTHIA, HERWIG and MC@NLO. We also show that the distribution of the output from an Artificial Neural Network obtained with the different tools does not show significant differences. However, the final acceptance computed with PYTHIA is smaller than those obtained at NNLO and with HERWIG and MC@NLO. We also investigate the impact of the underlying event and hadronization on our results.

Extra discussion and references added

References in corpus (27)

• PYTHIA 6.4 Physics and Manual
• Parton distributions for the LHC
• An NNLO subtraction formalism in hadron collisions and its application to Higgs boson production at the LHC
• Vector boson production at hadron colliders: a fully exclusive QCD calculation at NNLO
• Electroweak gauge boson production at hadron colliders through O(alpha_s^2)
• NLO Electroweak Corrections to Higgs Boson Production at Hadron Colliders
• Precise predictions for the Higgs-boson decay H -> W W/Z Z -> 4 leptons
• NNLO predictions for the Higgs boson signal in the H->WW->lnu lnu and H->ZZ->4l decay channels
• NNLO corrections to event shapes in $e^{+}{e}^{-}$ annihilation
• NNLO corrections to 3-jet observables in electron-positron annihilation
• Higher-Order threshold effects to inclusive processes in QCD
• The W boson production cross section at the LHC through O(alpha_s^2)
• Second-order QCD corrections to the thrust distribution
• Next-to-Leading order Higgs + 2 jet production via gluon fusion
• Event shapes and jet rates in electron-positron annihilation at NNLO
• Jet rates in electron-positron annihilation at O(α_s^3) in QCD
• First determination of the strong coupling constant using NNLO predictions for hadronic event shapes in e^+e^- annihilations
• NNLO QCD predictions for the H -> WW -> l l nu nu signal at the LHC
• NNLO moments of event shapes in e+e- annihilation
• QCD threshold corrections to di-lepton and Higgs rapidity distributions beyond N${}^2$LO
• The infrared structure of e+ e- --> 3 jets at NNLO reloaded
• QCD radiation effects on the H->WW->l nu l nu signal at the LHC
• Two-loop electroweak corrections to Higgs production in proton-proton collisions
• Combining Monte Carlo generators with next-to-next-to-leading order calculations: event reweighting for Higgs boson production at the LHC
• The forward-backward asymmetry at NNLO revisited
• Combined CDF and Dzero Upper Limits on Standard Model Higgs Boson Production at High Mass (155-200 GeV/c2) with 3 fb-1 of data
• A Comparison of Predictions for SM Higgs Boson Production at the LHC

Cited by in corpus (7)

• MCFM for the Tevatron and the LHC
• Addendum to: Predictions for Higgs production at the Tevatron and the associated uncertainties
• HPro: A NLO Monte-Carlo for Higgs production via gluon fusion with finite heavy quark masses
• Inclusive Search for Standard Model Higgs Boson Production in the WW Decay Channel using the CDF II Detector
• The Tevatron Higgs exclusion limits and theoretical uncertainties: a critical appraisal
• Search for a Higgs boson in the diphoton final state using the full CDF data set from proton-antiproton collisions at \surds = 1.96 TeV
• Limit setting procedures and theoretical uncertainties in Higgs boson searches