Observation of Single Top Quark Production in Association with a Z Boson in Proton-Proton Collisions at ? s = 13 ?TeV
Yükleniyor...
Tarih
2019
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
The CMS Collaboration
Erişim Hakkı
Özet
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 uminosity of 77.4fb?1. The increased integrated luminosity, a multivariate lepton identification, and a redesigned analysis strategy mprove significantly the sensitivity of the analysis compared to previous searches for tZq production. The tZq signal is observed ith a significance well over 5 standard deviations. The measured tZq production cross section is ?(pp?tZq?t?+??q)=111±13(stat)+11?9(syst)?fb, for dilepton invariant masses above 30 GeV, in agreement with the standard model expectation.
Açıklama
Anahtar Kelimeler
Top quark, W & Z bosons, Hadron colliders
Kaynak
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
Sayı
Künye
Physical Review Letters 122, 132003 (2019
