We examine the possibility of placing limits on the composite structure of the W boson by looking for form-factor effects as well as a W anomalous magnetic moment (μW) in the processes W{→}e{ν}{γ}, {γ}e{→}W{ν}, and {ν}{}e{→}W{γ}. We find the most sensitive reaction to variation in the magnetic-moment parameter κW is {γ}e{→}W{ν}, which should be accessible at the Stanford Linear Collider and CERN LEP. We find that all three processes are quite sensitive to form-factor effects for a compositeness scale in the range 100<{Λ}<350 GeV. From these reactions future experiments should be able to observe W compositeness from the effects of a nonstandard κW, form factors, or both. If such effects are not observed, stringent limits on W compositeness can be obtained from these reactions.
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Robinson et al. (1986) studied this question.
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