Hadron structure in tau -> KKpi nu_tau decays

TL;DR

This paper investigates the hadronization process in tau decays to KKpi nu_tau, using resonance chiral Lagrangian and QCD constraints to predict hadron spectra and determine the dominant contributions.

Contribution

It provides a novel analysis of the hadronization structure in tau decays, emphasizing the dominance of vector contributions over axial-vector ones, based on resonance theory and QCD asymptotics.

Findings

Vector contribution dominates over axial-vector in all KKpi charge channels.

Predicted hadron spectra consistent with QCD constraints.

Resonance chiral Lagrangian effectively models the decay process.

Abstract

We analyse the hadronization structure of both vector and axial-vector currents leading to tau -> KKpi nu_tau decays. At leading order in the 1/Nc expansion, and considering only the contribution of the lightest resonances, we work out, within the framework of the resonance chiral Lagrangian, the structure of the local vertices involved in those processes. The couplings in the resonance theory are constrained by imposing the asymptotic behaviour of vector and axial-vector spectral functions ruled by QCD. In this way we predict the hadron spectra and conclude that, contrarily to previous assertions, the vector contribution dominates by far over the axial-vector one in all KKpi charge channels.