arXiv:0906.1386·v1·High Energy Physics — Phenomenology
Status of the Hadronic tau Decay Determination of |V_{us}|
K. Maltman🇨🇦 · C.E. Wolfe🇨🇦 · S. Banerjee🇨🇦 · I.M. Nugent🇨🇦 · J.M. Roney🇨🇦
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.
Comments: 6 pages, 4 figures. Talk presented at the 10th International Workshop on Tau Lepton Physics (TAU08), Novosibirsk, Russia, 22-25 September, 2008