Measurement of W-Photon Couplings in p- p¯ Collisions at s=1.8 TeV

Abstract

We report on a study of $W+$ photon production in approximately 20 ${\mathrm{pb}}^{\ensuremath{-}1}$ of $p\ensuremath{-}\overline{p}$ collisions at $\sqrt{s}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.8$ TeV recorded with the Collider Detector at Fermilab. Our results are in good agreement with standard model expectations and are used to obtain limits on anomalous $\mathrm{CP}$-conserving $\mathrm{WW}\ensuremath{\gamma}$ couplings of $\ensuremath{-}2.3<\ensuremath{\Delta}\ensuremath{\kappa}<2.2$ for $\ensuremath{\lambda}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0$ and $\ensuremath{-}0.7<\ensuremath{\lambda}<0.7$ for $\ensuremath{\Delta}\ensuremath{\kappa}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0$ at 95% C.L. We obtain the same limits for $\mathrm{CP}$-violating couplings. These results provide limits on the higher-order electromagnetic moments of the $W$ boson of $0.8<{g}_{W}<3.1$ for ${q}_{W}^{e}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1$ and $\ensuremath{-}0.6<{q}_{W}^{e}<2.7$ for ${g}_{W}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}2$ at 95% C.L.