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Lattice Input on the Inclusive $τ$ Decay $V_{us}$ Puzzle

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Original languageEnglish
JournalInternational Journal of Modern Physics: Conference Series
Publication statusPublished - 18 Dec 2014
EventInternational Workshop on e+e- Collisions from Phi to Psi 2013 - Rome, Italy
Duration: 9 Sep 201312 Sep 2013


Recent analyses of flavor-breaking hadronic-$\tau$-decay-based sum rules produce values of $\vert V_{us}\vert$ $\sim 3\sigma$ low compared to 3-family unitarity expectations. An unresolved systematic issue is the significant variation in $\vert V_{us}\vert$ produced by different prescriptions for treating the slowly converging $D=2$ OPE series. We investigate the reliability of these prescriptions using lattice data for various flavor-breaking correlators and show the fixed-scale prescription is clearly preferred. Preliminary updates of the conventional $\tau$-based, and related mixed $\tau$-electroproduction-data-based, sum rule analyses incorporating B-factory results for low-multiplicity strange $\tau$ decay mode distributions are then performed. Use of the preferred FOPT $D=2$ OPE prescription is shown to significantly reduce the discrepancy between 3-family unitarity expectations and the sum rule results.

    Research areas

  • hep-ph, hep-ex, hep-lat


International Workshop on e+e- Collisions from Phi to Psi 2013


Rome, Italy

Event: Conference

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