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Search for the exclusive $W$ boson hadronic decays $W^{\pm}\to\pi^{\pm}\gamma$, $W^{\pm}\to K^{\pm}\gamma$ and $W^{\pm}\toho^{\pm}\gamma$ with the ATLAS detector
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Search for the exclusive $W$ boson hadronic decays $W^{\pm}\to\pi^{\pm}\gamma$, $W^{\pm}\to K^{\pm}\gamma$ and $W^{\pm}\toho^{\pm}\gamma$ with the ATLAS detector

Georges Aad, Braden Keim Abbott, Kira Abeling, Nils Julius Abicht, Haider Abidi, Asmaa Aboulhorma, Halina Abramowicz, Henso Abreu, Yiming Abulaiti, Bobby Samir Acharya, …
Deutsches Elektronen-Synchrotron, DESY, Hamburg
2023
DOI: https://doi.org/10.3204/pubdb-2023-06714

摘要

branching ratio: upper limit CERN LHC Coll experimental results GeV-cms p p: colliding beams p p: scattering quantum chromodynamics: factorization rho W --> K photon W --> pi photon W --> rho photon W: branching ratio W: coupling W: hadronic decay W: mass W: radiative decay W: rare decay
A search for the exclusive hadronic decays $W^{\pm}\to \pi^{\pm}\gamma$, $W^{\pm}\to K^{\pm}\gamma$ and $W^{\pm}\to \rho^{\pm}\gamma$ is performed using up to $140\, \text{fb}^{-1}$ of proton-proton collisions recorded with the ATLAS detector at a center-of-mass energy of $\sqrt{s}=13\,\text{TeV}$. These rare processes provide a test bench for the quantum chromodynamics factorization formalism used to calculate cross sections at colliders, as well as a probe of $W$ boson coupling to quarks and a new way to measure the $W$ boson mass through fully reconstructed decay products. The search results in the most stringent upper limit to date on the branching fractions $\mathcal{B}(W^{\pm}\to \pi^{\pm}\gamma) < 1.9\times10^{-6}$, $\mathcal{B}(W^{\pm}\to K^{\pm}\gamma) < 1.7\times10^{-6}$, $\mathcal{B}(W^{\pm}\to \rho^{\pm}\gamma) < 5.2\times10^{-6}$ at 95% confidence level.

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