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 $\beta =6.0$ 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 $f_{D_s}=237\pm 16$ MeV, $f_D=221\pm 17$ MeV ($f_{D_s}/f_D=1.07(4)$), $f_{B_s}=205\pm 35$ MeV, $f_B=180\pm 32$ MeV ($f_{B_s}/f_B=1.14(8)$), in good agreement with previous estimates.

Comments: 15 pages, Latex with one postscript figure