Test of QCD indū→W − γg, the radiation amplitude zero and the magnetic moment of theW boson

Abstract

We have calculated the differential cross-section for the processdū→W − γg (Jet). It is found that, although the radiation amplitude zero, which occurs for the lowest-order processdū→W −γ, is spoiled, there remains a very large dip. Hence, both processes can be used to measure the magnetic moment of the W boson and the value of the quark charges. The presence of a dip is a test of the gauge theoretical value for the magnetic moment of theW bosong=K+1=2, and the angle at which the dip occurs is a measure of the quark charges.