Finite Width Effects and Gauge Invariance in Radiative W Production and Decay
U. Baur, D. Zeppenfeld
Abstract
The naive implementation of finite width effects in processes involving unstable particles can violate gauge invariance. For the example of radiative W production and decay, q q' νγ, at tree level, it is demonstrated how gauge invariance is restored by including the imaginary part of triangle graphs in addition to resumming the imaginary contributions to the W vacuum polarization. Monte Carlo results are presented for the Fermilab Tevatron.
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