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

Research output: Contribution to journalArticle

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.

Details

Authors
External organisations
  • Université Claude Bernard
  • CSIC-UV - Instituto de Física Corpuscular (IFIC)
  • N2P3 Institut National de Physique Nucleaire et de Physique des Particules
  • University of Valencia
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics
Original languageEnglish
Article number014017
JournalPhysical Review D
Volume94
Issue number1
Publication statusPublished - 2016 Jul 15
Publication categoryResearch
Peer-reviewedYes
Externally publishedYes