Evidence forW+W−Production inp¯pCollisions ats=1.8TeV

We present results of a search for $W^{+}{W}^{-}$ production through the leptonic decay channel $W^{+}{W}^{-}\to l^{+}{l}^{-}\nu \overline{\nu }$ in $\overline{p}p$ collisions at $\sqrt{s}=1.8\mathrm{}\mathrm{TeV}$. In a $108{\mathrm{pb}}^{-1\mathrm{}}$ data sample recorded with the Collider Detector at Fermilab, five $W^{+}{W}^{-}$ candidates are found with an expected standard model background of $1.2\pm 0.3$ events. The $W^{+}{W}^{-}$ production cross section is measured to be $\sigma (\overline{p}p\to W^{+}{W}^{-}){=10.2\mathrm{}}_{-5.1\mathrm{}}^{+6.3\mathrm{}}\left(\mathrm{stat}\right)\pm 1.6\left(\mathrm{syst}\right)\mathrm{pb}$, in agreement with the standard model prediction. Limits on $\mathrm{WW}\gamma$ and $\mathrm{WWZ}$ anomalous couplings are presented.