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

Francesco Micheli; Pasquale Musella; Francesca Nessi-Tedaldi; Felicitas Pauss; Albert M Sirunyan; Gaël Perrin; Malte Backhaus; Luca Perrozzi; Pirmin Berger; Simone Pigazzini; Nadezda Chernyavskaya; Michael Reichmann; Günther Dissertori; Christina Reissel; Michael Dittmar; Thomas Reitenspiess; Daniele Ruini; Mauro Donegà; Christian Dorfer; Diego A Sanz Becerra; Tirso Alejandro Gomez Espinosa; Myriam Schönenberger; Christophorus Grab; Lesya Shchutska; Dmitry Hits; Vittorio R Tavolaro; Thomas Klijnsma; Konstantinos Theofilatos; Werner Lustermann; Minna L Vesterbacka Olsson; Riccardo A Manzoni; Rainer Wallny; Matthieu Marionneau; D. H Zhu; Maren T Meinhard; CMS Collaboration

doi:10.1103/PhysRevLett.122.132003

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

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

Francesco Micheli, Pasquale Musella, Francesca Nessi-Tedaldi, Felicitas Pauss, Albert M Sirunyan, Gaël Perrin, Malte Backhaus, Luca Perrozzi, Pirmin Berger, Simone Pigazzini, …

Physical review letters, Vol.122(13), 132003

04/05/2019

DOI: 10.1103/PhysRevLett.122.132003

PMID: 31012605

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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 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. ISSN:0031-9007 ISSN:1079-7114

High Energy Physics

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Title: Subtitle: Observation of Single Top Quark Production in Association with a Z Boson in Proton-Proton Collisions at s =13 TeV
Creators: Francesco Micheli
Pasquale Musella
Francesca Nessi-Tedaldi
Felicitas Pauss
Albert M Sirunyan - Yerevan Physics Institute
Gaël Perrin
Malte Backhaus
Luca Perrozzi
Pirmin Berger
Simone Pigazzini
Nadezda Chernyavskaya
Michael Reichmann
Günther Dissertori
Christina Reissel
Michael Dittmar
Thomas Reitenspiess
Daniele Ruini - ETH Zurich
Mauro Donegà
Christian Dorfer - ETH Zurich
Diego A Sanz Becerra
Tirso Alejandro Gomez Espinosa
Myriam Schönenberger
Christophorus Grab
Lesya Shchutska
Dmitry Hits
Vittorio R Tavolaro
Thomas Klijnsma
Konstantinos Theofilatos
Werner Lustermann
Minna L Vesterbacka Olsson
Riccardo A Manzoni - ETH Zurich
Rainer Wallny
Matthieu Marionneau - ETH Zurich
D. H Zhu
Maren T Meinhard
CMS Collaboration
Contributors: Y Onel (Contributor) - University of Iowa, Physics and Astronomy
Resource Type: Journal article
Publication Details: Physical review letters, Vol.122(13), 132003
DOI: 10.1103/PhysRevLett.122.132003
PMID: 31012605
NLM abbreviation: Phys Rev Lett
ISSN: 0031-9007
eISSN: 1079-7114
Publisher: ETH Zurich
Language: English
Date published: 04/05/2019
Academic Unit: Physics and Astronomy
Record Identifier: 9984199692202771

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