Determination of Vus: recent progresses from theory
Vittorio Lubicz
Abstract
Recent experimental and theoretical results on kaon semileptonic decays have significantly improved the determination of the CKM matrix element Vus. After briefly summarizing the impact of the new experimental determinations, I will concentrate in this talk on the theoretical progresses, coming in particular from lattice QCD calculations. These results lead to the estimate |Vus|=0.2250 +- 0.0021, in good agreement with the expectation based on the determination of |Vud| and the unitarity of the CKM matrix.
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