Search for the Higgs boson decaying into a pair of b-jets and measurements of the cross sections of W bosons produced in association with heavy flavor jets with the ATLAS detector.

par M. Georges AAD (PHD student)

vendredi 17 mai 2013, 14:00 → 15:00 Europe/Paris

bat 25, salle Mondrian

Establishing the presence of a Standard Model Higgs boson is one of the most interesting subjects with LHC data collected in 2012. ATLAS and CMS discovered a new boson in July 2012 with a mass around 125 GeV. The new boson is observed decaying into a pair of photons, two Z bosons (4 leptons) and two W bosons (2 leptons and missing energy). The decay into fermions (pair of b-quarks or tau-leptons) is not yet observed at the LHC. The observation of the new boson decaying into a pair of b-quarks is mandatory to establish the presence of a Standard Model Higgs boson. The H-> bb presents the largest branching ratio at mH=125 GeV and thus it is particularly important for a precise measurement of the couplings in the Higgs sector. I will present the status of the search for the Higgs boson in the VH(H->bb) channels with the ATLAS experiment. The production of W bosons in association with heavy flavor jets is one of the most important backgrounds for the WH(H->bb) channel. These processes also constitute a test of pQCD. I will present ATLAS measurements for the W + heavy flavor production cross sections. by Georges Aad.