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Search for the standard model Higgs boson produced in association with top quarks and decaying into a bb¯ pair in pp collisions at √s = 13 TeV with the ATLAS detector

Physical Review D - Particles, Fields, Gravitation and Cosmology. 2018. Vol.  97. No.  072016. P. 072016-1-072016-44.

A search for the Standard Model Higgs boson produced in association with a top-quark pair, tt¯H, is presented. The analysis uses 36.1 fb-1 of pp collision data at √s = 13 TeV, collected with the ATLAS detector at the Large Hadron Collider in 2015 and 2016. The search targets the Hbb¯ decay mode. The selected events contain either one or two electrons or muons from the top-quark decays, and are then categorized according to the number of jets and how likely these are to contain b-hadrons. Multivariate techniques are used to discriminate between signal and background events, the latter being dominated by tt¯ + jets production. For a Higgs boson mass of 125 GeV, the ratio of the measured tt¯H signal cross-section to the Standard Model expectation is found to be μ=0.84+0.64−0.61. A value of μ greater than 2.0 is excluded at 95% confidence level while the expected upper limit is μ<1.2 in the absence of a tt¯H signal.