Weak dipole moments in $τ$ decays to hadrons

Abstract

A description of three body tau decays with general vectorial and derivative (non-minimal) couplings is presented for experiments where the tau direction of flight is not reconstructed. The proposed interactions may be due to charged current weak dipole moment couplings and hence to structure of the $τ$ lepton. The decay distribution is expressed in terms of seven real parameters plus an overall normalization factor. Comments on the extension of the formalism to two-body decays are included. The particular cases of $\TA1$ and $\TP2$ are discussed in detail.