A high statistics lattice calculation of heavy-light meson decay constants

Abstract We present a high statistics study of the D- and B -meson decay constants. The results were obtained by using the Clover and Wilson lattice actions at two different values of the lattice spacing a , corresponding to β = 6.0 and 6.2. After a careful analysis of the systematic errors present in the extraction of the physical results, by assuming quite conservative discretization errors, we find f D s = 237 ± 16 MeV, f D = 221 ± 17 MeV ( f D s f D = 1.07(4) ), f B s = 205 ± 35 MeV, f B = 180 ± 32 MeV ( f B s f B = 1.14(8) ), in good agreement with previous estimates.