Abstract
A search for a Higgs boson produced in association with a pair of top quarks and decaying into apair of b quarks is presented. The analysis uses an integrated luminosity of 4.7 fb−1 of pp collisions at a center-of-mass energy of = 7 TeV collected in 2011 with the ATLAS detector at the LHC. The search is focused on the semileptonic decay of the tt̄ system and combines nine different topologies given by the jet and b-tagged jet multiplicities of the event. A kinematic reconstruction of the Higgs boson mass is performed in the signal enhanced region, which becomes the primary discriminant variable between signal and background. Background-dominated samples are exploited to constrain the leading systematic uncertainties affecting the background prediction. No significant excess of events above the background expectation is observed. For a Higgs boson with a mass of 125 GeV, an observed (expected) 95% confidence upper limit of 13.1 (10.5) times the Standard Model cross section is obtained.
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