Search for the Exclusive W Boson Hadronic Decays W±→π±γ, W±→K±γ and W±→ρ±γ with the ATLAS Detector.
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(Published version)
Date
2024
Authors
Aad, G.
Abbott, B.
Abeling, K.
Abicht, N.J.
Abidi, S.H.
Aboulhorma, A.
Abramowicz, H.
Abreu, H.
Abulaiti, Y.
Acharya, B.S.
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Journal article
Citation
Physical Review Letters, 2024; 133(16):161804--1-161804-23
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ATLAS Collaboration
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Abstract
A search for the exclusive hadronic decays W±→π±γ, W±→K±γ, and W±→ρ±γ is performed using up to 140 fb-1 of proton-proton collisions recorded with the ATLAS detector at a center-of-mass energy of √s=13 TeV. If observed, these rare processes would provide a unique test bench for the quantum chromodynamics factorization formalism used to calculate cross sections at colliders. Additionally, at future colliders, these decays could offer a new way to measure the W boson mass through fully reconstructed decay products. The search results in the most stringent upper limits to date on the branching fractions B(W}→π±γ)<1.9×10-6, B(W±→K±γ)<1.7×10-6, B(W±→ρ±γ)<5.2×10-6 at 95% confidence level.
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© 2024 CERN, for the ATLAS 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 .