Theoretical progress on the V_us determination from tau decays

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dc.creatorGamiz, Elvira
dc.creatorJamin, Matthias
dc.creatorPich, Antonio
dc.creatorPrades, Joaquim
dc.creatorSchwab, Felix
dc.date2007-09-03
dc.date.accessioned2026-07-07T11:42:11Z
dc.date.available2026-07-07T11:42:11Z
dc.descriptionA very precise determination of V_us can be obtained from the semi-inclusive hadronic decay width of the tau lepton into final states with strangeness. The ratio of the Cabibbo-suppressed and Cabibbo-allowed tau decay widths directly measures (V_us/V_ud)^2, up to very small SU(3)-breaking corrections which can be theoretically estimated with the needed accuracy. Together with previous LEP and CLEO data, the recent measurements by Babar and Belle of some Cabibbo-suppressed tau decays imply V_us= 0.2165 +- 0.0026_exp +- 0.0005_th, which is already competitive with the standard extraction from K_l3 decays. The uncertainty is largely dominated by experimental errors and should be easily reduced with the high statistics of the B factories, providing the most accurate determination of this parameter. A 1% experimental precision on the Cabibbo-suppressed tau decay width would translate into a 0.6% uncertainty on V_us.
dc.descriptionInvited talk at the Kaon International Conference -KAON'07- (Frascati, Italy, May 21-25, 2007)
dc.identifierhttps://arxiv.org/abs/0709.0282
dc.identifierhttp://arxiv.org/abs/0709.0282
dc.identifierPoSKAON:008,2008
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/200795
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Experiment
dc.titleTheoretical progress on the V_us determination from tau decays
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