Compact Muon Solenoid
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| CMS-PAS-SMP-20-008 | ||
| Search for the rare exclusive hadronic decay of a W boson into a pion and a photon in proton-proton collisions at 13 TeV | ||
| CMS Collaboration | ||
| July 2020 | ||
| Abstract: A search is performed for the rare exclusive hadronic decay $\mathrm{W}\to\pi\gamma$ in pp collisions at $\sqrt{s} = $ 13 TeV. Data collected by the CMS experiment at the LHC during the 2016, 2017 and 2018 data-taking periods, which correspond to an integrated luminosity of 137 fb$^{-1}$, are analyzed. The analysis exploits the W boson production from $\mathrm{t\bar{t}}$ events. The leptonic decay of the W boson from one of the top quarks is used to tag the event, and the b-jets are exploited to reduce the QCD background from the hadronization of light quarks. The W boson originating from the other top quark is used to search for the $\mathrm{W}\to\pi\gamma$ decay. The rare decay is characterized by a high-transverse momentum, isolated track and a high-energy, isolated photon. The $\mathrm{W}\to\pi\gamma$ decay is not observed, and an upper limit is set to its branching fraction, corresponding to 1.51 $ \times $ 10$^{-5} $ at 95% confidence level. | ||
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Links:
CDS record (PDF) ;
inSPIRE record ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, PLB 819 (2021) 136409. The superseded preliminary plots can be found here. |
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Compact Muon Solenoid LHC, CERN |
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