Search for the Standard Model Higgs boson produced in association with top quarks and decaying to bbar in pp collisions at sqrt(s)=7 TeV with the ATLAS detector at the LHC

A search for a Higgs boson produced in association with a pair of top quarks (ttH) and decaying\ninto a pair of bottomquarks H -> bb is presented. The search is focused on the semileptonic decay\nof the tt system and exploits different topologies given by the jet and b-tagged jet multiplicities\nof the event. A kinematic reconstruction of the ttH topology is performed in the signal enhanced\nregion, which becomes the primary discriminant variable between signal and background. Using\n4.7/fb of data collected with the ATLAS detector during Run 1 of the Large Hadron Collider, we\nobtain an observed (expected) 95% confidence-level upper limit of 13.1 (10.5) times the Standard\nModel cross section for a Higgs boson with a mass of 125 GeV.