Measuring the quark condensate from the decays tau -> 3 pi + nu(tau)

TL;DR

This paper investigates how the decay process tau -> 3 pi + nu(tau) can be used to measure the quark condensate, providing a potential experimental approach to probe QCD vacuum properties.

Contribution

It proposes a method to extract the quark condensate value from tau decay data focusing on the S-wave contribution near threshold.

Findings

Sensitivity of tau decay to the quark condensate demonstrated

Potential for experimental measurement of <qq> from decay spectra

Analysis of threshold region enhances condensate detection

Abstract

The possibility of detecting the S-wave of the decays tau -> 3 pi + nu(tau) in the threshold region is explored, with emphasis on the sensitivity to the size of the quark antiquark condensate <qq>.