Measurement of the $\mathit{WW}\mathit{\gamma }$ Gauge Boson Couplings in $\mathit{p}\overline{p}$ Collisions at $\sqrt{s}=1.8\mathrm{}$ TeV

The $\mathrm{WW}\gamma$ gauge boson couplings were measured using $p\overline{p}\to \ell \nu \gamma +X$ ( $\ell =e,\mu$) events at $\sqrt{s}=1.8\mathrm{}$ TeV observed with the D0 detector at the Fermilab Tevatron Collider. The signal, obtained from the data corresponding to an integrated luminosity of $13.8{\mathrm{pb}}^{-1\mathrm{}}$, agrees well with the standard model prediction. A fit to the photon transverse energy spectrum yields limits at the $95\%$ confidence level on the $\mathrm{CP}$-conserving anomalous coupling parameters of $-1.6<\Delta \kappa <1.8\mathrm{}$ ( $\lambda =0\mathrm{}$) and $-0.6<\lambda <0.6\mathrm{}$ ( $\Delta \kappa =0\mathrm{}$). Similar limits are obtained for the $\mathrm{CP}$-violating coupling parameters.