Search for the Higgs boson decaying to b quarks and produced in association with a W or Z boson with the ATLAS Detector

An important question in particle physics at present is whether the recently discovered particle with m = 125 GeV is the Standard Model Higgs boson. A SM Higgs boson with mH = 125 GeV would predominantly decay to b-quark pairs (BR=58%). The latest results of the search with the ATLAS Detector for a SM Higgs boson produced in association with a W or Z boson and decaying to b-quark pairs is presented. In order to search for the decay modes ZH→vvbb, WH→lvbb and ZH→llbb events with zero, one or two leptons were considered in 4.7 fb-1 of 7 TeV and 13.0 fb-1 of 8 TeV LHC data. No significant excess was observed. For mH = 125 GeV the observed (expected) upper limit on the cross-section times the branching ratio was found to be 1.8 (1.9) times the Standard Model prediction. Diboson production with a Z boson decaying to b-quark pairs was observed with a significance of 4.0 standard deviations and at a rate compatible with the Standard Model expectation.