Sirunyan, AM;
Tumasyan, A;
Adam, W;
Ambrogi, F;
Asilar, E;
Bergauer, T;
Brandstetter, J;
... Woods, N; + view all
(2019)
Observation of Single Top Quark Production in Association with a Z Boson in Proton-Proton Collisions at √s=13 TeV.
Physical Review Letters
, 122
(13)
, Article 132003. 10.1103/PhysRevLett.122.132003.
Preview |
Text
PhysRevLett.122.132003.pdf - Published Version Download (396kB) | Preview |
Abstract
The observation of single top quark production in association with a Z boson and a quark ( t Z q ) 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 77.4 fb − 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 t Z q production. The t Z q signal is observed with a significance well over 5 standard deviations. The measured t Z q production cross section is σ ( p p → t Z q → t ℓ + ℓ − q ) = 111 ± 13 ( stat ) + 11 − 9 ( syst ) fb , for dilepton invariant masses above 30 GeV, in agreement with the standard model expectation.
| Type: | Article |
|---|---|
| Title: | Observation of Single Top Quark Production in Association with a Z Boson in Proton-Proton Collisions at √s=13 TeV |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.122.132003 |
| Publisher version: | https://doi.org/10.1103/PhysRevLett.122.132003 |
| Language: | English |
| Additional information: | This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
| Keywords: | Science & Technology, Physical Sciences, Physics, Multidisciplinary, Physics |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10073737 |
Archive Staff Only
 |
View Item |
