V_us From Hadronic Tau Decays

Details V_us From Hadronic Tau Decays V_us From Hadronic Tau Decays

2006-07-19

arxiv.org/abs/hep-ph/0607214v1

Phys.Lett. B639 (2006) 283-289

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, prepared for the proceedings of the 9th Conference on the Intersections of Particle and Nuclear Physics (CIPANP06), W

Scientific paper

10.1063/1.2402645

We study extractions of |V_us| based on finite energy sum rule (FESR) analyses of hadronic tau decay data. We show (i) that the ``(0,0) spectral weight'' implementation (proposed previously in the literature as a favorable version of this analysis) suffers from significant convergence problems, but (ii) that alternate implementations exist which bring these problems under control. Results based on present spectral data are shown to be in agreement with those of other approaches, though with, at present, somewhat larger experimental errors. Sub-1% determinations of |V_us| are also shown to be expected from these alternate analyses once tau data from the B factories becomes available.

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