Observation of WZγ production and constraints on new physics scenarios in proton-proton collisions at √(s) = 13 TeV

2025/03/27 by CMS Collaboration · 2 voices
#hep-ex

paper · pdf · doi:10.48550/arxiv.2503.21977

Abstract

A measurement of the WZγ 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 √(s) = 13 TeV recorded with the CMS detector at the LHC, corresponding to an integrated luminosity of 138 fb^-1. The analysis focuses on the final state with three charged leptons, ℓ^±νℓ⁺ℓ^-, where ℓ = e or μ, accompanied by an additional photon. The observed (expected) significance of the WZγ signal is 5.4 (3.8) standard deviations. The cross section is measured in a fiducial region, where events with an ℓ originating from a tau lepton decay are excluded, to be 5.48 ± 1.11 fb, which is compatible with the prediction of 3.69 ± 0.24 fb 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 axion-like particles.

Discussions

• Collisions where three different force carriers interact are uncommon in the standard model and at the LHC. This #CMSpaper 1394 confirms these super-rare collisions that would be much more common if t [bsky, 5 points, 0 comments]
• #CMSpaper: Observation of WZγ production and constraints on new physics scenarios in proton-proton collisions at √s = 13 TeV (arXiv:2503.21977) https://arxiv.org/abs/2503.21977 #StandardModel [bsky, 1 points, 0 comments]

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