Radiative Decay of the W Boson and the Radiation Amplitude Zero (original) (raw)

Progress of Theoretical Physics, 1985

Abstract

We consider here the radiative decays of the W boson W-tobar{u}dgamma and W-to ebar{nu}egamma. As was shown by Grose and Mikaelian, these processes have a radiation amplitude zero which occurs along a line in the Dalitz plot u, v where u=1-(2Ebar{q}/Mw) and v=1-(2Eq/Mw). Here we adopt the more convenient variables x=(2E&gamma/Mw) and y=(Eq-Ebar{q})/Er. The zero condition now takes the simple

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