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

CMS Collaboration; A. M. Sirunyan; A. Tumasyan; W. Adam; Francisco Javier Cuevas Maestro; Javier Fernández Menéndez; Isidro González Caballero; Juan Rodrigo González Fernández; José Enrique Palencia Cortezón; Sergio Sánchez Cruz; Ignacio Suárez Andrés; Jesús Manuel Vizán García

doi:10.1007/JHEP07(2017)003

Back

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 article

Open access

Peer reviewed

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

CMS Collaboration, A. M. Sirunyan, A. Tumasyan, W. Adam, Francisco Javier Cuevas Maestro, Javier Fernández Menéndez, Isidro González Caballero, Juan Rodrigo González Fernández, José Enrique Palencia Cortezón, Sergio Sánchez Cruz, …

Journal of high energy physics : JHEP, Vol.2017(7), 3

01/01/2017

DOI: 10.1007/JHEP07(2017)003

Files and links (1)

url

https://doi.org/10.1007/JHEP07(2017)003View

Published (Version of record) Open Access

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−1 recorded by the CMS experiment at the LHC in proton-proton collisions at s√=8�=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+ 8− 7 fb 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%.

Details

Title: Subtitle: 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
Creators: CMS Collaboration
A. M. Sirunyan
A. Tumasyan
W. Adam
Francisco Javier Cuevas Maestro
Javier Fernández Menéndez
Isidro González Caballero
Juan Rodrigo González Fernández
José Enrique Palencia Cortezón
Sergio Sánchez Cruz
Ignacio Suárez Andrés
Jesús Manuel Vizán García
Contributors: Yasar Onel (Contributor) - University of Iowa, Physics and Astronomy
Resource Type: Journal article
Publication Details: Journal of high energy physics : JHEP, Vol.2017(7), 3
DOI: 10.1007/JHEP07(2017)003
ISSN: 1126-6708
eISSN: 1029-8479
Language: English
Date published: 01/01/2017
Academic Unit: Physics and Astronomy
Record Identifier: 9984386333902771

Metrics

2 Record Views

26 Times Cited - Web of Science

See more details