We search for the rare decay ${\mathit{W}}^{\pm }$→γ${\mathrm{\pi }}^{\pm }$ in 4.2 ${\mathrm{pb}}^{\mathrm{-}1}$ of pp¯ collisions recorded with the Collider Detector at Fermilab. At the 95% confidence level, we find an upper limit on the partial decay width to be Γ(${\mathit{W}}^{\pm }$→γ${\mathrm{\pi }}^{\pm }$)/Γ(${\mathit{W}}^{\pm }$→${\mathit{e}}^{\pm }$ν)≤7.5×${10}^{\mathrm{-}3}$.

• Received 10 June 1992

DOI:https://doi.org/10.1103/PhysRevLett.69.2160