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

CMS Collaboration; Canelli, Maria Florencia; Kilminster, Benjamin; Aarrestad, Thea K; Brzhechko, Danyyl; Caminada, Lea; De Cosa, Annapaoloa; Del Burgo, Riccardo; Donato, Silvio; Galloni, Camilla; Hreus, Tomas; Leontsinis, Stefanos; Mikuni, Vinicius Massami; Neutelings, Izaak; Rauco, Giorgia; Robmann, Peter; Salerno, Daniel; Schweiger, Korbinian; Seitz, Claudia; Takahashi, Yuta; Wertz, Sebastien; Zucchetta, Alberto (2018). Evidence for associated production of a Higgs boson with a top quark pair in final states with electrons, muons, and hadronically decaying $\tau$ leptons at $\sqrt s$ = 13 TeV. Journal of High Energy Physics, 08:066.

Abstract

Results of a search for the standard model Higgs boson produced in association with a top quark pair $(t\bar{t}H)$ 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 $\sqrt s =13 TeV$ 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 $1.23_{- 0.43}$ $^{+ 0.45}$ times the production rate expected in the standard model, with an observed (expected) significance of 3.2σ (2.8σ), which represents evidence for $t\bar{t}H$ 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.

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Scopus Subject Areas:Physical Sciences > Nuclear and High Energy Physics
Language:English
Date:2018
Deposited On:22 Feb 2019 13:30
Last Modified:20 Oct 2024 01:37
Publisher:Springer
ISSN:1029-8479
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1007/JHEP08(2018)066
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  • Licence: Creative Commons: Attribution 4.0 International (CC BY 4.0)

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