High Precision determination of the pi, K, D and D_s decay constants from lattice QCD

E. Follana, C. T. H. Davies, G. P. Lepage +1

We determine $D$ and $D_s$ decay constants from lattice QCD with 2% errors, 4 times better than experiment and previous theory: $f_{D_s}$ = 241(3) MeV, $f_D$ = 207(4) MeV and $f_{D…