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

Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Ambrogi, F. and Asilar, E. and Bergauer, T. and Brandstetter, J. and Dragicevic, M. and Eroe, J. and Del Valle, A. Escalante and Flechl, M. and Fruehwirth, R. and Ghete, V. M. and Hrubec, J. and Jeitler, M. and Krammer, N. and Kraetschmer, I and Liko, D. and Madlener, T. and Mikulec, I and Rad, N. and Rohringer, H. and Schieck, J. and Schoefbeck, R. and Spanring, M. and Spitzbart, D. and Waltenberger, W. and Wittmann, J. and Wulz, C-E and Zarucki, M. and Chekhovsky, V and Mossolov, V and Gonzalez, J. Suarez and De Wolf, E. 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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 sigma(pp -> tZq -> tl(+) l(-) q) = 111 +/- 13 (stat)(-9)(+11) (syst) fb, for dilepton invariant masses above 30 GeV, in agreement with the standard model expectation.

Item Type:	Journal Article
Publication:	PHYSICAL REVIEW LETTERS
Publisher:	AMER PHYSICAL SOC
Additional Information:	The copyright for this article belongs to AMER PHYSICAL SOC
Department/Centre:	Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Date Deposited:	29 May 2019 07:22
Last Modified:	29 May 2019 07:22
URI:	http://eprints.iisc.ac.in/id/eprint/62543

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