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

Rimoldi, Marco; Mullier, Geoffrey; Miucci, Antonio; Merlassino, Claudia; Haug, Sigve; Weber, Michael; Meloni, Federico; Beck, Hans Peter; Ereditato, Antonio (2018). Search for the standard model Higgs boson produced in association with top quarks and decaying into a bb̅ pair in pp collisions at √s = 13 TeV with the ATLAS detector. Physical review. D - particles, fields, gravitation, and cosmology, 97(7) American Physical Society 10.1103/PhysRevD.97.072016

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A search for the standard model Higgs boson produced in association with a top-quark pair, tt̅H, is presented. The analysis uses 36.1fb⁻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 H → bb̅ 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 tt̅ + jets production. For a Higgs boson mass of 125 GeV, the ratio of the measured tt̅H signal cross-section to the standard model expectation is found to be μ¼0.84 +0.64 −0.61. A value of μ greater than 2.0 is excluded at 95% confidence level (C.L.) while the expected upper limit is μ < 1.2 in the absence of a tt̅H signal.

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