Lattice Input on the tau V-us Puzzle

K. Maltman*, P. A. Boyle, Luigi Del Debbio, R. J. Hudspith, N. Garron, E. Kerrane, J. M. Zanotti

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

vertical bar V-us vertical bar values obtained from recent hadronic-tau-decay-based flavor-breaking sum rule analyses are significantly lower than expectations based on 3-family unitarity and results obtained from other sources. We use lattice data to investigate the accuracy/reliability of the OPE representation of the flavor-breaking correlator combination entering these analyses. The behavior of an alternate combination, chosen to reduce problems associated with the slow convergence of the D = 2 OPE series, and entering an alternate mixed tau-electroproduction sum rule, is also investigated. Preliminary updates of both analyses, predicated on lessons learned from the lattice data, are also presented.

Original languageEnglish
Pages (from-to)52-55
Number of pages4
JournalNuclear Physics B - Proceedings Supplements
Volume253
DOIs
Publication statusPublished - 2014
Event12th International Workshop on Tau-Lepton Physics - Nagoya, Japan
Duration: 17 Sep 201221 Sep 2012

Keywords

  • vertical bar V-us vertical bar
  • tau decays
  • lattice QCD
  • sum rules
  • SPECTRAL FUNCTIONS
  • MASS

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