Search for the standard model Higgs boson produced in association with top quarks and decaying into a b(b)overbar pair in pp 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 b(b)overbar pair in pp collisions at √s=13 TeV with the ATLAS detector PHYSICAL REVIEW D, 97 (7). 072016-. ISSN 2470-0010, 2470-0029

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Abstract

A search for the standard model Higgs boson produced in association with a top-quark pair, ttH, 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 ttH 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 ttH 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: 16 Jun 2026 13:08
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
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