Vus from pi and K decay constants in full lattice QCD with physical u, d, s and c quarks
By R. Dowdall, C. Davies, G. Peter Lepage, Craig McNeile. 2013
154 citations recorded by the source corpus.
We determine the decay constants of the π and K mesons on gluon field configurations from the MILC Collaboration including u , d , s , and c quarks. We use three values of the lattice spacing and u/d quark masses going down to the physical value. We use the w0 parameter to fix the relative lattice spacing and fπ to fix the overall scale. This allows us to obtain a value for fK+/fπ+=1.1916(21). Comparing to the ratio of experimental leptonic decay rates gives |Vus|=0.22564(28)Br(K+)(20)EM(40)latt(5)Vud and the test of unitarity of the first row of the Cabibbo-Kobayashi-Maskawa matrix: |Vud|2+|Vus|2+|Vub|2−1=0.000 09(51).
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/f25fd3546955a128107f9ae82e959a7677c992c4
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Citations in the corpus
- Leading hadronic contribution to the muon magnetic moment from lattice QCD (2020, result): “erent continuum extrapolations. For the electric derivatives we took the denition in Equation (147). Our result (161) is in good agreement with earlier fouravor determinations: w 0 = 0:1715(9) fm of [88] and w 0 = 0:1714 +15 12 fm of [89]. In these works the isospin-breaking eects were only estimate”