A critical look at V_us determinations from hadronic tau decay data

Details A critical look at V_us determinations from hadronic tau decay data A critical look at V_us determinations from hadronic tau decay data

2010-11-29

arxiv.org/abs/1011.6391v2

Nucl.Phys.Proc.Suppl.218:146-151,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, 4 figures. Prepared for: Proceedings of the 11th International Workshop on Tau Lepton Physics, Manchester, UK, Septem

Scientific paper

10.1016/j.nuclphysbps.2011.06.02

A critical review of hadronic tau decay data based determinations of |V_{us}| is given, focussing on the impact of the slow convergence of the integrated D=2 OPE series for the conventional flavor-breaking sum rule determination and the potential role of as-yet-unmeasured multiparticle contributions to the strange spectral distribution. Additional information obtainable from analyses of inclusive strange decay data alone, and from mixed electroproduction-tau sum rules with much reduced OPE uncertainties, is also discussed. Self-consistency tests are shown to favor determinations which reduce somewhat discrepancies with 3-family unitarity expectations.

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