Evidence for associated production of a Higgs boson with a top quark pair in final states with electrons, muons, and hadronically decaying τ leptons at √s=13 TeV

Sirunyan, A. M. and Tumasyan, A. R. and Adam, Wolfgang and Ambrogi, Federico and Asilar, Ece and Md. Ali, Mohd. Adli (2018) Evidence for associated production of a Higgs boson with a top quark pair in final states with electrons, muons, and hadronically decaying τ leptons at √s=13 TeV. Journal of High Energy Physics, 2018 (8). pp. 1-54. ISSN 1126-6708 E-ISSN 1029-8479

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Abstract

Results of a search for the standard model Higgs boson produced in association with a top quark pair (ttH) in final states with electrons, muons, and hadronically decaying τ leptons are presented. The analyzed data set corresponds to an integrated luminosity of 35.9 fb−1 recorded in proton-proton collisions at √ s = 13 TeV by the CMS experiment in 2016. The sensitivity of the search is improved by using matrix element and machine learning methods to separate the signal from backgrounds. The measured signal rate amounts to 1.23+0.45 −0.43 times the production rate expected in the standard model, with an observed (expected) significance of 3.2σ (2.8σ), which represents evidence for ttH production in those final states. An upper limit on the signal rate of 2.1 times the standard model production rate is set at 95% confidence level.

Item Type:	Article (Journal)
Additional Information:	7861/69998
Uncontrolled Keywords:	Hadron-Hadron scattering (experiments), Higgs physics, Top physics
Subjects:	Q Science > Q Science (General) Q Science > QC Physics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science Kulliyyah of Science > Department of Physics
Depositing User:	Dr Mohd Adli MD Ali
Date Deposited:	23 Jan 2019 12:42
Last Modified:	31 Jan 2019 11:17
URI:	http://irep.iium.edu.my/id/eprint/69998

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