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|V_us| from Strange Hadronic Tau Data

AuthorsGámiz, Elvira; Jamin, Matthias; Pich, Antonio ; Prades, Joaquim ; Schwab, Félix
Issue DateNov-2007
PublisherWorld Scientific Publishing
CitationHigh Energy Physics 2: 786-789 (2007)
AbstractWe report on recent work to determine the CKM matrix element |V_{us}| using strange hadronic \tau decay data. We use the recent OPAL update of the strange spectral function, while on the theory side we update the dimension-two perturbative contribution including the recently calculated \alpha_s^3 terms. Our result |V_{us}|=0.2220 \pm 0.0033 is already competitive with the standard extraction from K_{e3} decays and other new proposals to determine |V_{us}|. The actual uncertainty on |V_{us}| from \tau data is dominated largely by experiment and will eventually be much reduced by B-factories and future \tau-charm factory data, providing one of the most accurate determinations of this Standard Model parameter.
Description4 páginas.-- Comunicación presentada en la 33ª International Conference on High Energy Physics (ICHEP'06) celebrada del 26 de Julio al 2 de Agosto de 2006 en Moscu (Rusia).-- Editores: Alexey Sissakian, Gennady Kozlov y Elena Kolganova.-- arXiv:hep-ph/0610246v1
Publisher version (URL)http://www.worldscibooks.com/physics/6312.html
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