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 Aguilar Saavedra, Juan Antonio Atlas Collaboration HIGGS ATLAS 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 H→bb¯ 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=0.84-0.61+0.64. 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 tt¯H signal. 2019-06-24T00:10:36Z 2019-06-24T00:10:36Z 2018 info:eu-repo/semantics/article Aguilar-Saavedra, J.A. [et al.]. 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 97, 072016 (2018). [http://hdl.handle.net/10481/56083] 2470-0010 http://hdl.handle.net/10481/56083 10.1103/PhysRevD.97.072016 eng http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess Atribución 3.0 España American Physical Society