SPECIAL ISSUE: Proceedings of the 4th International Conference on Flavor Physics (ICFP) Beijing, China, 24–28 September 2007; Editors: Chun Liu and Tian-Jun LiNo Access

STATUS OF THE HADRONIC τ DETERMINATION OF V_us

K. MALTMAN

Department of Math and Stats, York University, 4700 Keele St., Toronto, Ontario M3J 1P3, Canada

Present address: CSSM, Univ. of Adelaide, Adelaide, SA 5005 Australia.

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C. E. WOLFE

Department of Math and Stats, York University, 4700 Keele St., Toronto, Ontario M3J 1P3, Canada

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S. BANERJEE

Department of Physics and Astronomy, University of Victoria, PO Box 3055, STN CSC, Victoria, BC V8W 3P6, Canada

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M. RONEY

Department of Physics and Astronomy, University of Victoria, PO Box 3055, STN CSC, Victoria, BC V8W 3P6, Canada

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, and

I. NUGENT

Department of Physics and Astronomy, University of Victoria, PO Box 3055, STN CSC, Victoria, BC V8W 3P6, Canada

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https://doi.org/10.1142/S0217751X08041803Cited by:18 (Source: Crossref)

Abstract

We update the extraction of V_us from hadronic τ decay data in light of recent BaBar and Belle results on the branching fractions of a number of important strange decay modes. A range of sum rule analyses is employed, particular attention being paid to those based on “non-spectral weights”, developed previously to bring the slow convergence of the relevant integrated D = 2 OPE series under improved control. Results from the various sum rules are in good agreement with one another, but ~ 3σ below expectations based on 3-family unitarity.

Keywords:

PACS: 12.15.Hh, 13.35.Dx

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