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arXiv · hep-ph/0612154

|V_us| and m_s from hadronic tau decays

Elvira Gamiz·Matthias Jamin·Antonio Pich·Joaquim Prades·Felix Schwab
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Abstract

Recent progress in the determination of |V_us| 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 alpha_s^3 term on the theory side. These updates result in |V_us| = 0.2220 +- 0.0033, with the uncertainty presently being dominated by experiment, and already being competitive with the standard extraction from K_e3 decays and other new proposals to determine |V_us|. 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 |V_us| from tau decays is expected to be much reduced in the near future.

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Elvira Gamiz, Matthias Jamin, Antonio Pich, Joaquim Prades, Felix Schwab. 2006-12-12. |V_us| and m_s from hadronic tau decays. https://doi.org/10.1016/j.nuclphysbps.2007.02.053

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