Higgs to bb in ATLAS

This talk presents an updated search with the ATLAS experiment for the Standard Model Higgs boson produced in association with a W or Z boson and decaying to bb using 4.7 fb−1 of LHC proton-proton data at √s = 7 TeV and 13.0 fb−1 at √s = 8 TeV. The search is performed using events containing zero, one or two electrons or muons targeting the three decay modes ZH → ννbb , WH → lνbb and ZH → l+l−bb. No significant excess is observed. For mH = 125 GeV, the observed (expected) upper 95% confidence level limit on the cross section times the branching ratio is found to be 1.8 (1.9) times the Standard Model prediction. A Standard Model Higgs boson with mH = 110 GeV is excluded. As a validation of the analysis procedure, the production of diboson pairs, WZ and ZZ, with a Z boson decaying to bb, has been observed with a significance of 4.0 standard deviations and a rate compatible with the Standard Model expectation.