2005/05/26 by Vittorio Lubicz, Lubicz, Vittorio
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/0505223
Prepared for 17th Les Rencontres de Physique de la Vallee d'Aoste: Results and Perspectives in Particle Physics, La Thuile, Italy, February 27-March 5, 2005
arxiv created 2005/05/26 · arxiv updated 2009/12/01
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.