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Theoretical progress on the V_us determination from tau decays

AuthorsGámiz, Elvira; Jamin, Matthias; Pich, Antonio ; Prades, Joaquim ; Schwab, Félix
Issue Date2007
PublisherInternational School for Advanced Studies
CitationPoS - Proceedings of Science (KAON) 008 (2007)
AbstractA 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.
Description9 páginas.-- Comunicación presentada a la Kaon International Conference (KAON'07) celebrada del 21 al 25 de MAyo de 2007 en Frascati (Italia).
Publisher version (URL)http://pos.sissa.it/cgi-bin/reader/conf.cgi?confid=46
Appears in Collections:(IFIC) Artículos
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