• Open Access

Observation of Single Top Quark Production in Association with a Z Boson in Proton-Proton Collisions at s=13TeV

A. M. Sirunyan et al. (CMS Collaboration)
Phys. Rev. Lett. 122, 132003 – Published 5 April 2019
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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 77.4fb1. 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(pptZqt+q)=111±13(stat)9+11(syst)fb, for dilepton invariant masses above 30 GeV, in agreement with the standard model expectation.

  • Figure
  • Received 14 December 2018
  • Revised 27 February 2019

DOI:https://doi.org/10.1103/PhysRevLett.122.132003

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

© 2019 CERN, for the CMS Collaboration

Physics Subject Headings (PhySH)

  1. Physical Systems
Particles & Fields

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Vol. 122, Iss. 13 — 5 April 2019

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