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ChPT parameters from tau-decay data

Abstract : Using the updated ALEPH V-A spectral function from tau decays, we determine the lowest spectral moments of the left-right correlator and extract dynamical information on order parameters of the QCD chiral symmetry breaking. Uncertainties associated with violations of quark-hadron duality are estimated from the data, imposing all known short-distance constraints on a resonance-based parametrization. Employing proper pinched weight functions, we obtain an accurate determination of the effective chiral couplings L10 and C87 and the dimension-six and -eight contributions in the Operator Product Expansion.
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Contributor : Dominique Girod <>
Submitted on : Thursday, October 15, 2015 - 11:23:56 AM
Last modification on : Thursday, June 17, 2021 - 3:19:04 PM

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A. Rodríguez-Sánchez, M. González-Alonso, A. Pich. ChPT parameters from tau-decay data. 18th High-Energy Physics International Conference in Quantum Chromodynamics (QCD 15), Jun 2015, Montpellier, France. pp.108-112, ⟨10.1016/j.nuclphysbps.2016.02.023⟩. ⟨in2p3-01215889⟩



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