Inclusive tau lepton hadronic decay in vector and axial-vector channels within dispersive approach to QCD

TL;DR

This paper reviews the dispersive approach to QCD and applies it to analyze experimental data on inclusive tau lepton hadronic decay in vector and axial-vector channels, extending perturbation theory into the infrared domain.

Contribution

It introduces a dispersive QCD framework that incorporates nonperturbative constraints and applies it to recent experimental tau decay data.

Findings

Dispersive approach effectively describes tau decay data.

Extends perturbative QCD applicability to low-energy domain.

Provides insights into nonperturbative QCD effects.

Abstract

The dispersive approach to QCD, which properly embodies the intrinsically nonperturbative constraints originating in the kinematic restrictions on relevant physical processes and extends the applicability range of perturbation theory towards the infrared domain, is briefly overviewed. The study of OPAL (update 2012) and ALEPH (update 2014) experimental data on inclusive tau lepton hadronic decay in vector and axial-vector channels within dispersive approach is presented.