We search for the rare decay $W^{\pm }\to D_s^{\pm }\gamma$ in $82{\mathrm{pb}}^{\mathrm{-}1}$ of $p\overline{p}$ collisions recorded with the Collider Detector at Fermilab. At the 95% confidence level, we find an upper limit on the relative branching fraction to be $\Gamma {(W}^{\pm }\to D_s^{\pm }\gamma )/\Gamma {(W}^{\pm }\to e^{\pm }\nu )<\mathrm{}1.2\mathrm{}\times {10}^{-2}.$

• Received 8 April 1998

DOI:https://doi.org/10.1103/PhysRevD.58.091101