Update analysis of tau- --> V P- nu(tau): Theory and Experiment

TL;DR

This paper analyzes tau lepton decays into vector resonances and mesons using resonance chiral theory, fitting spectral functions and decay distributions to predict branching ratios for various channels.

Contribution

It provides a theoretical framework for tau decay processes involving vector resonances and predicts branching ratios based on spectral function fits.

Findings

Fitted spectral functions for tau decays involving omega pi and omega K channels.

Predicted branching ratios for multiple tau decay channels.

Validated resonance couplings within the resonance chiral theory.

Abstract

Within the resonance chiral theory, we have studied the process of a tau lepton decaying into a vector resonance plus a pseudo-Goldstone meson and a tau neutrino. Two kinds of processes are discussed: (a) tau- --> (rho pi-,omega pi-, phi pi-, K*0 K-) nu(tau), belonging to Delta S=0 processes and (b) Delta S = 1 processes, such as tau- --> (rho K-, omega K-,phi K-,\bar{K*0} pi-) nu(tau). To fit the tau- --> omega pi- nu(tau) spectral function and the decay distribution of tau- --> omega K- nu(tau) to get unknown resonance couplings, we then make a prediction for branching ratios of all channels.