Observation of ๐โข๐โข๐พ production and constraints on new physics scenarios in proton-proton collisions at โ๐ =13โโTeV
Journal
Physical Review D
Journal Volume
112
Journal Issue
1
Start Page
012009
ISSN
2470-0010
2470-0029
Date Issued
2025-07-15
Author(s)
Abstract
A measurement of the ๐โข๐โข๐พ triboson production cross section is presented. The analysis is based on a data sample of proton-proton collisions at a center-of-mass energy of โ๐ =13โโTeV recorded with the CMS detector at the LHC, corresponding to an integrated luminosity of 138โโfbโ1. The analysis focuses on the final state with three charged leptons, โยฑโข๐โขโ+โขโโ, where โ =๐ or ๐, accompanied by an additional photon. The observed (expected) significance of the ๐โข๐โข๐พ signal is 5.4 (3.8) standard deviations. The cross section is measured in a fiducial region, where events with an โ originating from a tau lepton decay are excluded, to be 5.48 ยฑ1.11โโfb, which is compatible with the prediction of 3.69 ยฑ0.24โโfb at next-to-leading order in quantum chromodynamics. Exclusion limits are set on anomalous quartic gauge couplings and on the production cross sections of massive axionlike particles.
Publisher
American Physical Society (APS)
Type
journal article