Search for Associated Production of a Z Boson with a Single Top Quark and for tZ Flavour-Changing Interactions in Pp Collisions at √s = 8 TeV
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Author(s)
CMS Collaboration
Abercrombie, Daniel Robert
Allen, Brandon Leigh
Apyan, Aram
Azzolini, Virginia
Barbieri, Riccardo
Baty, Austin Alan
Bi, Ran
Bierwagen, Katharina
Brandt, Stephanie Akemi
Date Issued
July 2017
Journal
Journal of High Energy Physics
Publisher
Springer Nature
Citation
Sirunyan, A. M. et al. “Search for Associated Production of a Z Boson with a Single Top Quark and for tZ Flavour-Changing Interactions in Pp Collisions at
√s = 8 TeV.” Journal of High Energy Physics 2017, 7 (July 2017): 3 © 2017 The Author(s)
Version
Final published version
Abstract
A search for the production of a single top quark in association with a Z boson is presented, both to identify the expected standard model process and to search for flavour-changing neutral current interactions. The data sample corresponds to an integrated luminosity of 19.7 fb⁻1recorded by the CMS experiment at the LHC in proton-proton collisions at √s = 8 TeV. Final states with three leptons (electrons or muons) and at least one jet are investigated. An events yield compatible with tZq standard model production is observed, and the corresponding cross section is measured to be σ(pp → tZq → ℓνbℓ⁺ℓ⁻q) = 10₋₇⁺⁸fb with a significance of 2.4 standard deviations. No presence of flavour-changing neutral current production of tZq is observed. Exclusion limits at 95% confidence level on the branching fractions of a top quark decaying to a Z boson and an up or a charm quark are found to be ℬ(t → Zu) < 0.022% and ℬ(t → Zc) < 0.049%.[Figure not available: see fulltext.]. Keywords: Flavour Changing Neutral Currents; Hadron-Hadron scattering (experiments); Top physics
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1007/JHEP07(2017)003
