Observation of Single Top Quark Production in Association with a Z Boson in Proton-Proton Collisions at √ s = 13 TeV
Author(s)
The CMS Collaboration; Abercrombie, Daniel Robert; Allen, Branden; Azzolini, Virginia; Baty, Austin Alan; Bi, Ran; Brandt, Stephanie Akemi; Busza, Wit; Cali, Ivan Amos; D'Alfonso, Mariarosaria; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Harris, Philip Coleman; Hsu, David; Hu, Miao; Klute, Markus; Kovalskyi, Dmytro; Lee, Y.-J.; Luckey Jr, P David; Maier, Benedikt; Marini, Andrea Carlo; McGinn, Christopher Francis; Mironov, Camelia Maria; Narayanan, S.; Niu, Xinmei; Paus, Christoph M. E.; Rankin, Dylan S.; Roland, Christof E; Roland, Gunther M; Shi, Z.; Stephans, George S. F.; Sumorok, Konstanty C; Tatar, Kaya; Velicanu, Dragos Alexandru; Wang, J.; Wang, T. W.; Wyslouch, Boleslaw; ... Show more Show less
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© 2019 CERN. 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.
Date issued
2019Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science; Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Department of Aeronautics and AstronauticsJournal
Physical Review Letters
Publisher
American Physical Society (APS)