Limits on Anomalous $WW\gamma$ Couplings from $p\bar{p}\to W\gamma +X$ Events at $\sqrt{s}=1.8$ TeV

Abstract

We have measured the $WW\gamma$ gauge boson coupling parameters using $p\bar{p}\to \ell \nu \gamma +X$ ($\ell =e,\mu$) events at $\sqrt{s}=1.8$ TeV. The data, corresponding to an integrated luminosity of 89.1 pb^{-1}, were collected using the D0 detector at the Fermilab Tevatron Collider. The measured cross section times branching ratio for $p\bar{p}\to W\gamma +X$ with $p_T^{\gamma }$ > 10 GeV/c and $R_{\ell \gamma }>0.7$ is ${11.8}_{-1.6}^{+1.7}\pm 2.0$ pb, in agreement with the Standard Model prediction. The one degree of freedom 95% confidence level limits on individual CP-conserving parameters are $-0.98<\Delta \kappa <1.01$ and $-0.33<\lambda <0.31$. Similar limits are set on the CP}violating coupling parameters.

10 pages, including two figures. Paper submitted to Phys. Rev. Lett

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