Excited tau lepton contribution to $W->tau nu(tau)$ decay at the one-loop level

Diaz, Rodolfo A.; Martinez, R.; Sampayo, O. A.

Excited tau lepton contribution to $W->tau nu(tau)$ decay at the one-loop level

Authors

Diaz, Rodolfo A.

Martinez, R.

Sampayo, O. A.

Description

We evaluate the compositeness effects of tau lepton on the vertex W-tau-nu(tau) in the context of an effective Lagrangian approach. We consider that only the third family is composed and we get the corrections to the non universal lepton coupling g_(tau)/g_(e). As the experimental bounds on non universal lepton couplings in W decays are weak, we find that the excited particles contributions do not give realistic limits on the excited mass, since they lead to Lambda<m*.
7 pages, 3 figures, version to appear in Modern Physics Letters A