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arXiv · 1602.06112

Updated determination of chiral couplings and vacuum condensates from hadronic tau decay data

A. Rodríguez-Sánchez·M. González-Alonso·A. Pich
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Abstract

We analyze the lowest spectral moments of the left-right two-point correlation function, using all known short-distance constraints and the recently updated ALEPH V-A spectral function from tau decays. This information is used to determine the low-energy couplings L10 and C87 of chiral perturbation theory and the lowest-dimensional contributions to the Operator Product Expansion of the left-right correlator. A detailed statistical analysis is implemented to assess the theoretical uncertainties, including violations of quark-hadron duality.

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A. Rodríguez-Sánchez, M. González-Alonso, A. Pich. 2016-02-19. Updated determination of chiral couplings and vacuum condensates from hadronic tau decay data. https://doi.org/10.1103/physrevd.94.014017

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