Search for Higgs boson production in association with a top quark pair in pp collisions

5th International Workshop on Top Quark Physics

Brinkerhoff, Andrew^1

University of Notre Dame, Notre Dame IN, United States^1

关键词: Branching ratio;    Higgs boson;    Higgs Boson decay;    Output distribution;    Pair production;    Pp collisions;    Production cross section;    The standard model;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/452/1/012006/pdf
DOI  :  10.1088/1742-6596/452/1/012006

来源: IOP

【 摘 要 】

We present a search for the standard model Higgs boson produced in association with a top quark pair in 5 fb-1of 7 TeV pp collision data. We look for events where the Higgs boson decays to b and the top quark pair decays to either lepton plus jets (t → νjjb) or dileptons (t → ννb), whereis an electron or muon. The major background to our signal is top pair production. We use artificial neural networks to discriminate between background and signal events. We perform a simultaneous fit for signal and background fractions using the neural network output distributions. Our expected limit on Higgs boson production cross section times H → b branching ratio for a Higgs boson mass of 125 GeV/c2is 4.6 times the standard model expectation, while the observed limit is 3.8 times the standard model expectation.