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Observation of single top quark production in association with a Z Boson in proton-proton collisions at s =13 TeV

Sirunyan, A. M. and Tumasyan, A. R. and Adam, Wolfgang and Ambrogi, Federico and Md.Ali, Mohd Adli (2019) Observation of single top quark production in association with a Z Boson in proton-proton collisions at s =13 TeV. Physical Review Letters, 122 (13). pp. 1-19. ISSN 0031-9007 E-ISSN 1079-7114

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Abstract

The observation of single top quark production in association with a Z boson and a quark (tZq) is reported. Events from proton-proton collisions at a center-of-mass energy of 13 TeV containing three charged leptons (either electrons or muons) and at least two jets are analyzed. The data were collected with the CMS detector in 2016 and 2017 and correspond to an integrated luminosity of 77.4fb-1. The increased integrated luminosity, a multivariate lepton identification, and a redesigned analysis strategy improve significantly the sensitivity of the analysis compared to previous searches for tZq production. The tZq signal is observed with a significance well over 5 standard deviations. The measured tZq production cross section is σ(pp→tZq→t?+?-q)=111±13(stat)-9+11(syst) fb, for dilepton invariant masses above 30 GeV, in agreement with the standard model expectation.

Item Type: Article (Journal)
Additional Information: 7861/72646
Uncontrolled Keywords: Analysis strategies, Charged leptons, Integrated luminosity, Invariant mass, Production cross section, Proton proton collisions, Standard deviation, The standard model
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: 14 Jun 2019 16:02
Last Modified: 18 Jun 2019 14:42
URI: http://irep.iium.edu.my/id/eprint/72646

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