Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2006-05-15
Physics
High Energy Physics
High Energy Physics - Experiment
8 pages, 4 figures; Proceedings of The XLIrst Rencontres de Moriond on Electroweak Interactions And Unified Theories
Scientific paper
The most precise determination of Vus comes from semileptonic kaon decays. We have measured with the KLOE detector at DAFNE, the Frascati phi-factory, all the experimental inputs to Vus for both neutral and charged kaons. Using our results we extract the value of Vus with about 0.9% fractional error, which is entirely dominated by the theoretical error on the knowledge of the normalization of the decay form factors, f0. A new determination of the ratio Vus/Vud is also presented, based on our precise measurement of the absolute branching ratio for the decay K+ -> mu+nu, combined with recent lattice results for the ratio f_K/f_pi. New results on CPT symmetry have also been achieved, which are based on the first measurement of the charge asymmetry for Ks -> pi e nu decay.
KLOE collaboration for the
Palutan Matteo
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