2013

Vus from pi and K decay constants in full lattice QCD with physical u, d, s and c quarks

Dowdall, R. J., Davies, C. T. H., Lepage, G. P. et al.

Understand

We determine the decay constants of the pi 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 w_0 parameter to fix the relative lattice spacing and f_pi to fix the overall scale.
This allows us to obtain a value for f{K^+}/f{pi^+} = 1.1916(21).

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