$\tau$ Anomalous Couplings and Radiation Zeros in the $e^{+}{e}^{-}\to \tau \bar{\tau }\gamma$ process

Abstract

The process $e^{+}{e}^{-}\to \tau \bar{\tau }\gamma$ contains configurations of the four-momenta for which the scattering amplitude vanishes (Radiation Zeros or Null Zone). These Radiation Zeros only occur for couplings given by a gauge theory, in particular the standard model. Therefore they are sensitive to physics beyond the standard model as the anomalous magnetic and weak moment of the $\tau$ lepton. In this article we compute the effect of these anomalous interactions on the Radiation Zeros in the above mentioned process.

Comments: 12 pages, 10 figures