Search for the associated production of the Higgs boson with a top quark pair in multilepton final states with the ATLAS detector

doi:10.1016/j.physletb.2015.07.079

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DOI Доступ к ресурсу на сайте издателя				10.1016/j.physletb.2015.07.079

Title: Search for the associated production of the Higgs boson with a top quark pair in multilepton final states with the ATLAS detector
Creator: Aad, G.
Creator: Abdallah, J.
Creator: Chelkov, G. A.
Creator: Abbott, B.
Contributor: Томский государственный университет Радиофизический факультет Научные подразделения РФФ
Subject: ATLAS, детектор
Большой адронный коллайдер
Хиггса бозон
столкновение частиц
лептоны
кварки
Date: 2015
DOI: 10.1016/j.physletb.2015.07.079
Description: A search for the associated production of the Higgs boson with a top quark pair is performed in multilepton final states using 20.3 fb−1 of proton-proton collision data recorded by the ATLAS experiment at s√=8 TeV at the Large Hadron Collider. Five final states, targeting the decays H→WW∗, ττ, and ZZ∗, are examined for the presence of the Standard Model (SM) Higgs boson: two same-charge light leptons (e or μ) without a hadronically decaying τ lepton; three light leptons; two same-charge light leptons with a hadronically decaying τ lepton; four light leptons; and one light lepton and two hadronically decaying τ leptons. No significant excess of events is observed above the background expectation. The best fit for the tt¯H production cross section, assuming a Higgs boson mass of 125 GeV, is 2.1+1.4−1.2 times the SM expectation, and the observed (expected) upper limit at the 95% confidence level is 4.7 (2.4) times the SM rate. The p-value for compatibility with the background-only hypothesis is 1.8σ; the expectation in the presence of a Standard Model signal is 0.9σ.

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collection(s): Радиофизический факультет
Identifier: vtls:000533911
http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000533911
Type: статьи в журналах
Source: Physics Letters B. 2015. Vol. 749. P. 519-541
Language: eng

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Радиофизический факультет Search for the associated production of the Higgs boson with a top quark pair in multilepton final states with the ATLAS detector