Hadronic decays of the tau lepton into K K pion modes within Resonance Chiral Theory

TL;DR

This paper analyzes tau lepton decays into K K pion modes using Resonance Chiral Theory, providing new insights into resonance contributions and vector current dominance, supported by comparison with experimental data.

Contribution

It introduces a novel application of Resonance Chiral Theory to tau decays into K K pion modes, highlighting vector current dominance and constraining relevant couplings.

Findings

Vector current dominance in tau decays into K K pion modes

Bounds on couplings in the Resonance Chiral Theory Lagrangian

Predicted spectral functions consistent with experimental data

Abstract

Tau decays into hadrons have a twofold interest: On the one hand, they are a clean environment for studying the hadronization of the left-handed current of QCD, while, on the other side, provide relevant dynamical information of the resonances that mediate these processes. Within an effective field theory-like framework, namely Resonance Chiral Theory, we analyse the decays ot the tau into K K pion modes and compare the results with CLEO and BaBar data. In this way, we provide bounds on the couplings entering our Lagrangian and predict the corresponding spectral functions. As a main result -and contrary to the bulk of theoretical studies and experimental analyses- we find vector current dominance on these decays.