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

Martín González-Alonso; Antonio Pich; Antonio Rodríguez-Sánchez

doi:10.1103/PhysRevD.94.014017

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

Martín González-Alonso, Antonio Pich, Antonio Rodríguez-Sánchez

Research output: Contribution to journal › Article › peer-review

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 τ 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.

Original language	English
Article number	014017
Journal	Physical Review D
Volume	94
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevD.94.014017
Publication status	Published - 2016 Jul 15
Externally published	Yes

Subject classification (UKÄ)

Subatomic Physics

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10.1103/PhysRevD.94.014017

Cite this

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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 τ 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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AB - 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 τ 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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Updated determination of chiral couplings and vacuum condensates from hadronic τ decay data

Abstract

Subject classification (UKÄ)

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