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A search for the Standard Model Higgs boson produced in association with atop-quark pair, $t\bar{t}H$, is presented. The analysis uses 36.1 fb$^{-1}$ of$pp$ collision data at $\sqrt{s}$ = 13 TeV, collected with the ATLAS detectorat the Large Hadron Collider in 2015 and 2016. The search targets the $H \tob\bar{b}$ decay mode. The selected events contain either one or two electronsor muons from the top-quark decays, and are then categorized according to thenumber of jets and how likely these are to contain $b$-hadrons. Multivariatetechniques are used to discriminate between signal and background events, thelatter being dominated by $t\bar{t}$ + jets production. For a Higgs boson massof 125 GeV, the ratio of the measured $t\bar{t}H$ signal cross-section to theStandard Model expectation is found to be $\mu = 0.84^{+0.64}_{-0.61}$. A valueof $\mu$ greater than 2.0 is excluded at 95% confidence level while theexpected upper limit is $\mu < 1.2$ in the absence of a $t\bar{t}H$ signal.

physical review. d/physical review. d.

Search for the Standard Model Higgs boson produced in association with  top quarks and decaying into a $b\bar{b}$ pair in $pp$ collisions at  $\sqrt{s}$ = 13 TeV with the ATLAS detector