Abstract: A search is performed for the rare decay W±??±?in proton-proton collisions at ?s=13 TeV. Data corresponding to an integrated luminosity of 137fb?1were collected during 2016 to 2018 with the CMS detector. This analysis exploits a novel search strategy based on Wboson production in top quark pair events. An inclusive search for the W±??±?decay is not optimal at the LHC because of the high trigger thresholds. Instead, a trigger selection is exploited in which the Wboson originating from one of the top quarks is used to tag the event in a leptonic decay. The Wboson emerging from the other top quark is used to search for the W±??±?signature. Such decays are characterized by an isolated track pointing to a large energy deposit, and by an isolated photon of large transverse momentum. The presence of bquark jets reduces the background from the hadronization of light-flavor quarks and gluons. The W±??±?decay is not observed. An upper exclusion limit is set to this branching fraction, corresponding to 1.50 ×10?5at 95%confidence level, whereas the expected upper exclusion limit is 0.85+0.52?0.29×10?5.

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