Search for a resonance decaying to a W boson and a photon in proton-proton collisions at $\sqrt{s}$ = 13 TeV using leptonic W boson decays

The CMS collaboration
CMS-EXO-21-017, 2024.

Abstract (data abstract)
A search for a new charged particle $\text{X}$ with mass between 0.3 and 2.0$~\mathrm{TeV}$ decaying to a W boson and a photon using proton-proton collision data at a center-of-mass energy of $13~\mathrm{TeV}$, collected by the CMS experiment and corresponding to an integrated luminosity of $138~\mathrm{fb}^{-1}$, is presented. Particle $\text{X}$ has electric charge $\pm1$ and is assumed to have spin 0. The search is performed using the electron and muon decays of the W boson. No significant excess above the predicted background is observed. The upper limit at $95\%$ confidence level on the product of the $\text{X}$ production cross section and its branching fraction to a W boson and a photon is found to be 94 (137)$~\mathrm{fb}$ for a $0.3~\mathrm{TeV}$ resonance and 0.75 (0.81)$~\mathrm{fb}$ for a $2.0~\mathrm{TeV}$ resonance, for an $\text{X}$ width-to-mass ratio of 0.01$\%$ (5$\%$). A statistical combination with an earlier study based on the hadronic decay mode of the W boson is also performed, and the upper limit at 95$\%$ confidence level for a 2.0$~\mathrm{TeV}$ resonance is reduced to 0.50 (0.63)$~\mathrm{fb}$ for an $\text{X}$ width-to-mass ratio of 0.01$\%$ (5$\%$).

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