<i>W</i>anomalous moments and the polarization asymmetry zero in γ<i>e</i>→<i>W</i>ν
<i>W</i>anomalous moments and the polarization asymmetry zero in γ<i>e</i>→<i>W</i>ν
We show from general principles that there must be a center-of-mass energy \ensuremath{\surd}${\mathit{s}}_{0}$ where the polarization asymmetry A=\ensuremath{\Delta}\ensuremath{\sigma}(\ensuremath{\gamma}e\ensuremath{\rightarrow}W\ensuremath{\nu})/\ensuremath{\sigma}(\ensuremath{\gamma}e\ensuremath{\rightarrow}W\ensuremath{\nu}) for circularly polarized photon and electron beams vanishes. In the case of the standard model, the crossing point where the asymmetry changes sign occurs in Born approximation at \ensuremath{\surd}${\mathit{s}}_{\ensuremath{\gamma}\mathit{e}}$ =3.1583. . .${\mathit{M}}_{\mathit{W}}$\ensuremath{\simeq}254 …