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

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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http://hal.in2p3.fr/in2p3-01289897
Contributor : Dominique Girod <>
Submitted on : Thursday, March 17, 2016 - 1:51:30 PM
Last modification on : Thursday, April 5, 2018 - 6:16:02 PM

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M. González-Alonso, A. Pich, A. Rodríguez-Sánchez. Updated determination of chiral couplings and vacuum condensates from hadronic tau decay data. Physical Review D, American Physical Society, 2016, 94, pp.014017. ⟨10.1103/PhysRevD.94.014017⟩. ⟨in2p3-01289897⟩

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