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

Research output: Contribution to journalArticle

Original languageEnglish
Article number100
JournalProceedings of Science
Issue numberConfinement X
Publication statusPublished - 21 Jan 2013
EventXth Quark Confinement and the Hadron Spectrum - Munich, Germany
Duration: 8 Oct 201212 Oct 2012


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.

    Research areas

  • hep-ph, hep-ex, hep-lat


Xth Quark Confinement and the Hadron Spectrum


Munich, Germany

Event: Conference

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ID: 17197143