Status of the Hadronic tau Decay Determination of |V_{us}|
arXiv:0906.1386 · doi:10.1016/j.nuclphysbps.2009.03.031
Abstract
We update the hadronic tau determination of |V_{us}|, showing that current strange branching fractions produce results 2-3 sigma lower than 3-family unitarity expectations. Issues related to the size of theoretical uncertainties and results from an alternate, mixed tau-electroproduction sum rule determination (which, by construction, produces a much smaller theoretical uncertainty), are also considered.
6 pages, 4 figures. Talk presented at the 10th International Workshop on Tau Lepton Physics (TAU08), Novosibirsk, Russia, 22-25 September, 2008
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