Measurement of the $WW\gamma$ gauge boson couplings in $p\bar{p}$ Collisions at $\sqrt{s}=1.8$ TeV

TL;DR

This paper reports a measurement of the $WW\gamma$ gauge boson couplings in proton-antiproton collisions at 1.8 TeV, confirming consistency with the Standard Model and setting limits on anomalous couplings.

Contribution

First measurement of $WW\gamma$ couplings at Tevatron energies using $par{p}$ collision data, providing constraints on anomalous gauge boson interactions.

Findings

Results agree with Standard Model predictions.

Set 95% confidence level limits on anomalous couplings.

Used data from 13.8 pb$^{-1}$ of integrated luminosity.

Abstract

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