Status of the Hadronic Tau Determination of V_us

Details Status of the Hadronic Tau Determination of V_us Status of the Hadronic Tau Determination of V_us

2008-07-21

arxiv.org/abs/0807.3195v1

Int.J.Mod.Phys.A23:3191-3195,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 2 figures, 1 table. Combined report on talks presented at the 4th International Conference on Flavor Physics, Beijing

Scientific paper

10.1142/S0217751X08041803

We update the extraction of |V_{us}| from hadronic tau decay data in light of recent BaBar and Belle results on the branching fractions of a number of important strange decay modes. A range of sum rule analyses is performed, particular attention being paid to those based on "non-spectral weights", developed previously to bring the slow convergence of the relevant integrated D=2 OPE series under improved control. Results from the various sum rules are shown to be in good agreement with one another, but ~3 sigma below expectations based on 3-family unitarity. Important avenues for future study are briefly discussed.

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