|Vus| and ms from hadronic tau decays
Elvira Gamiz, Matthias Jamin, Antonio Pich, Joaquim Prades, Felix Schwab
Abstract
Recent progress in the determination of |Vus| employing strange hadronic tau-decay data are reported. This includes using the recent OPAL update of the strange spectral function, as well as augmenting the dimension-two perturbative contribution with the recently calculated order alphas3 term on the theory side. These updates result in |Vus| = 0.2220 +- 0.0033, with the uncertainty presently being dominated by experiment, and already being competitive with the standard extraction from Ke3 decays and other new proposals to determine |Vus|. In view of the ongoing work to analyse tau-decay data at the B-factories BaBar and Belle, as well as future results from BESIII, the error on |Vus| from tau decays is expected to be much reduced in the near future.
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