Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-05-21
JHEP 0908:099,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
Extra discussion and references added
Scientific paper
10.1088/1126-6708/2009/08/099
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.
Anastasiou Charalampos
Dissertori Guenther
Grazzini Massimiliano
Stoeckli Fabian
Webber Bryan R.
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