Search for flavor changing neutral current interactions of the top quark in final states with a photon and additional jets in proton-proton collisions at √s=13 TeV
File(s)PhysRevD.109.072004.pdf (18.97 MB)
Published version
Author(s)
Type
Journal Article
Abstract
A search for the production of a top quark in association with a photon and additional jets via flavor
changing neutral current interactions is presented. The analysis uses proton-proton collision data recorded
by the CMS detector at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of
138 fb−1. The search is performed by looking for processes where a single top quark is produced in
association with a photon, or a pair of top quarks where one of the top quarks decays into a photon and an
up or charm quark. Events with an electron or a muon, a photon, one or more jets, and missing transverse
momentum are selected. Multivariate analysis techniques are used to discriminate signal and standard
model background processes. No significant deviation is observed over the predicted background.
Observed (expected) upper limits are set on the branching fractions of top quark decays: Bðt → uγÞ <
0.95 × 10−5 (1.20 × 10−5) and Bðt → cγÞ < 1.51 × 10−5 (1.54 × 10−5) at 95% confidence level, assuming
a single nonzero coupling at a time. The obtained limit for Bðt → uγÞ is similar to the current best limit,
while the limit for Bðt → cγÞ is significantly tighter than previous results.
changing neutral current interactions is presented. The analysis uses proton-proton collision data recorded
by the CMS detector at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of
138 fb−1. The search is performed by looking for processes where a single top quark is produced in
association with a photon, or a pair of top quarks where one of the top quarks decays into a photon and an
up or charm quark. Events with an electron or a muon, a photon, one or more jets, and missing transverse
momentum are selected. Multivariate analysis techniques are used to discriminate signal and standard
model background processes. No significant deviation is observed over the predicted background.
Observed (expected) upper limits are set on the branching fractions of top quark decays: Bðt → uγÞ <
0.95 × 10−5 (1.20 × 10−5) and Bðt → cγÞ < 1.51 × 10−5 (1.54 × 10−5) at 95% confidence level, assuming
a single nonzero coupling at a time. The obtained limit for Bðt → uγÞ is similar to the current best limit,
while the limit for Bðt → cγÞ is significantly tighter than previous results.
Date Issued
2024-04-01
Date Acceptance
2024-01-29
Citation
Physical Review D (particles, fields, gravitation, and cosmology), 2024, 109 (7)
ISSN
2470-0010
Publisher
American Physical Society
Journal / Book Title
Physical Review D (particles, fields, gravitation, and cosmology)
Volume
109
Issue
7
Copyright Statement
© 2024 CERN, for the CMS Collaboration Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Identifier
https://journals.aps.org/prd/abstract/10.1103/PhysRevD.109.072004
Subjects
Astronomy & Astrophysics
DECAYS
Physical Sciences
Physics
Physics, Particles & Fields
Science & Technology
Publication Status
Published
Article Number
072004
Date Publish Online
2024-04-05