New results from the lattice on the theoretical inputs to the hadronic tau determination of V_us

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

Research output: Contribution to journalArticlepeer-review

Abstract

Recent sum rule determinations of |V_us|, employing flavor-breaking combinations of hadronic tau decay data, are significantly lower than either expectations based on 3-family unitarity or determinations from K_ell3 and Gamma[K_mu2]/Gamma[pi_mu2]. We use lattice data to investigate the accuracy/reliability of the OPE representation of the flavor-breaking correlator combination entering the tau decay analyses. The behavior of an alternate correlator combination, constructed to reduce problems associated with the slow convergence of the D = 2 OPE series, and entering an alternate sum rule requiring both electroproduction cross-section and hadronic tau decay data, is also investigated. Preliminary updates of both analyses, with the lessons learned from the lattice data in mind, are also presented.
Original languageEnglish
Article number100
JournalProceedings of Science
Volume2012
Issue numberConfinement X
Publication statusPublished - 21 Jan 2013
EventXth Quark Confinement and the Hadron Spectrum - Munich, Germany
Duration: 8 Oct 201212 Oct 2012

Keywords

  • hep-ph
  • hep-ex
  • hep-lat

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