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

View/ Open
Issue Date
2019-04-05Author
Sirunyan, A. M.
Sanders, Stephen J.
CMS Collaboration
Publisher
American Physical Society
Type
Article
Article Version
Scholarly/refereed, publisher version
Rights
© 2019 CERN, for the CMS Collaboration.
Metadata
Show full item recordAbstract
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 → tℓ + ℓ − q) = 111 ± 13 (stat) + 11 − 9 (syst) fb, for dilepton invariant masses above 30 GeV, in agreement with the standard model expectation.
Description
This work is licensed under a Creative Commons Attribution 4.0 International License.
Collections
Citation
A. M. Sirunyan et al., "Observation of Single Top Quark Production in Association with a Z Boson in Proton-Proton Collisions at √s = 13 TeV", Phys. Rev. Lett. 122, 132003, 5 April 2019, American Physical Society, https://doi.org/10.1103/PhysRevLett.122.132003
Items in KU ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.
We want to hear from you! Please share your stories about how Open Access to this item benefits YOU.