Search for boosted ttH(H->bb) with the ATLAS detector

We have conducted a search for the ttH process with the Higgs decaying to a pair of b quarks using 36.1 fb^-1 of data taken with the ATLAS detector. One of the main challenges for this analysis is the combinatorial ambiguity from the many b quark jets in the final state which makes it difficult to reconstruct the Higgs boson. The boosted analysis specifically targets high-pT final states which helps resolve this issue. We select events where the decay products of the Higgs boson and hadronically decaying top quark are produced close together in a large jet. This requirement gives us access to different kinematics and a simplified combinatorial background compared to the resolved analysis. To select events rich in ttH, we apply cuts on the number of small jets and how likely these are to contain b-hadrons. Multivariate techniques are used to discriminate between signal and background events.