Status of the Hadronic tau Decay Determination of |V_{us}|

Details Status of the Hadronic tau Decay Determination of |V_{us}| Status of the Hadronic tau Decay Determination of |V_{us}|

2009-06-07

arxiv.org/abs/0906.1386v1

Nucl.Phys.Proc.Suppl.189:175-180,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 4 figures. Talk presented at the 10th International Workshop on Tau Lepton Physics (TAU08), Novosibirsk, Russia, 22-2

Scientific paper

10.1016/j.nuclphysbps.2009.03.03

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.

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