DIRECT MEASUREMENT OF THE W-GAMMA COUPLING AT THE CERN PBARP COLLIDER

The process pp→evγ+X is studied as √s=630 GeV. The observed signal is used to extract a direct measurement of the parameters κ and λ which define the magnetic dipoleand electric quadrupole moments of the W boson and therefore the WWγ coupling. We find κ=1+2.6−2.2 and λ=0+1.7−1.8 and their 95% confidence limits −3.5 <κ<5.9 and −3.6<λ<3.5. the results are model indepedent in good agreement with the standard values, κ="1" λ="0.