Can we use hadronic tau decay for V_us determination

Details Can we use hadronic tau decay for V_us determination Can we use hadronic tau decay for V_us determination

2007-12-18

arxiv.org/abs/0712.3025v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, 5 figures

Scientific paper

It is known that the discrepancy in pion spectral functions extracted from positron-electron annihilation and tau decay leads to different predictions for the muon anomalous magnetic moment. We will show that this discrepancy effects also the extraction of the Cabibbo angle from the hadronic tau decays. The corrections to the tau branching fractions, corresponding to the presence of new centi-weak tensor interactions, allow us to extract the Cabibbo angle from tau decays in agreement with its other precision determinations. Thus a more precise value of |V_us|=0.2246 +/- 0.0012 is obtained and as a consequence f(0)=0.9645 +/- 0.0055 and F_K/F_pi=1.196 +/- 0.007.

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