A measurement of the 𝑊⁢𝑍⁢𝛾 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±⁢𝜈⁢ℓ+⁢ℓ−, where ℓ =𝑒 or 𝜇, accompanied by an additional photon. The observed (expected) significance of the 𝑊⁢𝑍⁢𝛾 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 axionlike particles.

Observation of WZγ production and constraints on new physics scenarios in proton-proton collisions at sqrt{s} = 13 TeV

Cavallo, N.;Fabozzi, F.;
2025-01-01

Abstract

A measurement of the 𝑊⁢𝑍⁢𝛾 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±⁢𝜈⁢ℓ+⁢ℓ−, where ℓ =𝑒 or 𝜇, accompanied by an additional photon. The observed (expected) significance of the 𝑊⁢𝑍⁢𝛾 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 axionlike particles.
2025
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11563/201876
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 0
  • ???jsp.display-item.citation.isi??? 2
social impact