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

Abstract

Recent analyses of flavor-breaking hadronic-$τ$-decay-based sum rules produce values of $\vert V_{us}\vert$ $\sim 3σ$ 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 $τ$-based, and related mixed $τ$-electroproduction-data-based, sum rule analyses incorporating B-factory results for low-multiplicity strange $τ$ 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.

5 pages, 2 figures. Contribution to the proceedings of the International Workshop on e^+ e^- Collisions from Phi to Psi, 2013