Search for the standard model Higgs boson produced in association with top quarks and decaying into a <i>b</i>(b)overbar pair in <i>pp</i> collisions at √s=13 TeV with the ATLAS detector



Aaboud, M, Aad, G, Abbott, B, Abdinov, O, Abeloos, B, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H
et al (show 2756 more authors) (2018) Search for the standard model Higgs boson produced in association with top quarks and decaying into a <i>b</i>(b)overbar pair in <i>pp</i> collisions at √s=13 TeV with the ATLAS detector. PHYSICAL REVIEW D, 97 (7). 072016-.

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Abstract

A search for the Standard Model Higgs boson produced in association with a top-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 detector at the Large Hadron Collider in 2015 and 2016. The search targets the $H \to b\bar{b}$ 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 $t\bar{t}$ + jets production. For a Higgs boson mass of 125 GeV, the ratio of the measured $t\bar{t}H$ signal cross-section to the Standard Model expectation is found to be $\mu = 0.84^{+0.64}_{-0.61}$. A value of $\mu$ greater than 2.0 is excluded at 95% confidence level while the expected upper limit is $\mu < 1.2$ in the absence of a $t\bar{t}H$ signal.

Item Type: Article
Additional Information: 68 pages in total, author list starting page 52, 16 figures, 8 tables, published in Phys. Rev. D.. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2017-03/
Uncontrolled Keywords: hep-ex, hep-ex
Depositing User: Symplectic Admin
Date Deposited: 01 Jun 2018 15:31
Last Modified: 05 Oct 2023 14:57
DOI: 10.1103/PhysRevD.97.072016
Open Access URL: https://doi.org/10.1103/PhysRevD.97.072016
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3022015