Inclusive and differential cross section measurements of single top quark production in association with a Z boson in proton-proton collisions at root s=13 TeV
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
Inclusive and differential cross sections of single top quark production in association with a Z boson are measured in proton-proton collisions at a center-of-mass energy of 13 TeV with a data sample corresponding to an integrated luminosity of 138 fb−1 recorded by the CMS experiment. Events are selected based on the presence of three leptons, electrons or muons, associated with leptonic Z boson and top quark decays. The measurement yields an inclusive cross section of 87.9+7.5−7.3(stat)+7.3−6.0(syst) fb for a dilepton invariant mass greater than 30 GeV, in agreement with standard model (SM) calculations and represents the most precise determination to date. The ratio between the cross sections for the top quark and the top antiquark production in association with a Z boson is measured as 2.37+0.56−0.42(stat)+0.27−0.13(syst). Differential measurements at parton and particle levels are performed for the first time. Several kinematic observables are considered to study the modeling of the process. Results are compared to theoretical predictions with different assumptions on the source of the initial-state b quark and found to be in agreement, within the uncertainties. Additionally, the spin asymmetry, which is sensitive to the top quark polarization, is determined from the differential distribution of the polarization angle at parton level to be 0.54 ± 0.16 (stat) ± 0.06 (syst), in agreement with SM predictions.
Date Issued
2022-02-14
Date Acceptance
2022-01-26
Citation
The Journal of High Energy Physics, 2022, 2022 (2)
ISSN
1029-8479
Publisher
Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Journal / Book Title
The Journal of High Energy Physics
Volume
2022
Issue
2
Copyright Statement
Open Access, Copyright CERN,
for the benefit of the CMS Collaboration.
for the benefit of the CMS Collaboration.
License URL
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000757369100002&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Physical Sciences
Physics, Particles & Fields
Physics
Hadron-Hadron Scattering
Top Physics
Publication Status
Published
Article Number
ARTN 107
Date Publish Online
2022-02-14