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

Abstract

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 $\mathcal{B}(W^{\pm }\to {\pi }^{\pm }\gamma )<1.9\times 10^{-6}$, $\mathcal{B}(W^{\pm }\to K^{\pm }\gamma )<1.7\times 10^{-6}$, $\mathcal{B}(W^{\pm }\to {\rho }^{\pm }\gamma )<5.2\times 10^{-6}$ at 95% confidence level.

arXiv comment36 pages in total, author list starting page 19, 2 figures, 2 tables, published in Phys. Rev. Lett. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2019-20

References in corpus (31)

• An Introduction to PYTHIA 8.2
• New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
• Asymptotic formulae for likelihood-based tests of new physics
• A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX
• New parton distributions for collider physics
• Parton distributions with LHC data
• The ATLAS Simulation Infrastructure
• Performance of the ATLAS Trigger System in 2015
• Topological cell clustering in the ATLAS calorimeters and its performance in LHC Run 1
• Electron and photon performance measurements with the ATLAS detector using the 2015-2017 LHC proton-proton collision data
• Measurement of the $Z/{\gamma }^{\ast }$ boson transverse momentum distribution in $pp$ collisions at $\sqrt{s}$ = 7 TeV with the ATLAS detector
• ATLAS data quality operations and performance for 2015-2018 data-taking
• Luminosity determination in $pp$ collisions at $\sqrt{s}=13$ TeV using the ATLAS detector at the LHC
• Measurement of $W^{\pm }$ and $Z$-boson production cross sections in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Performance of the ATLAS Track Reconstruction Algorithms in Dense Environments in LHC Run 2
• Electron and photon energy calibration with the ATLAS detector using 2015-2016 LHC proton-proton collision data
• Measurement of the photon identification efficiencies with the ATLAS detector using LHC Run 2 data collected in 2015 and 2016
• Reconstruction of hadronic decay products of tau leptons with the ATLAS experiment
• Exclusive Radiative Decays of W and Z Bosons in QCD Factorization
• Interpolation between multi-dimensional histograms using a new non-linear moment morphing method
• Searches for exclusive Higgs and $Z$ boson decays into $J/\psi \gamma$, $\psi (2S)\gamma$, and ${\rm Y}(nS)\gamma$ at $\sqrt{s}=13$ TeV with the ATLAS detector
• Search for exclusive Higgs and $Z$ boson decays to $\varphi \gamma$ and $\rho \gamma$ with the ATLAS detector
• Search for Higgs and $Z$ Boson Decays to $\varphi \gamma$ with the ATLAS Detector
• Searches for exclusive Higgs and $Z$ boson decays into a vector quarkonium state and a photon using $139$ fb${}^{-1}$ of ATLAS $\sqrt{s}=13$ TeV proton$-$proton collision data
• Non-Parametric Data-Driven Background Modelling using Conditional Probabilities
• Search for the rare decay of the W boson into a pion and a photon in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Possible huge enhancement in the radiative decay of the weal W boson into the charmed $D_s$ meson
• Measurement of the energy response of the ATLAS calorimeter to charged pions from $W^{\pm }\to {\tau }^{\pm }(\to {\pi }^{\pm }{\nu }_{\tau }){\nu }_{\tau }$ events in Run 2 data
• Search for W boson decays to three charged pions
• Search for the Rare Radiative Decay: $W\to \pi \gamma$ in \ppbar\ Collisions at $\sqrt{s}=1.96$ TeV
• Search for the rare decays $W^{+}\to D_s^{+}\gamma$ and $Z\to D^0\gamma$ at LHCb

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