Journal
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
Volume 23, Issue 21, Pages 3191-3195Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0217751X08041803
Keywords
CKM matrix elements; tau decay; sum rules
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We update the extraction of V-us from hadronic tau 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 similar to 3 sigma below expectations based on 3-family unitarity.
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