A Lattice Computation of the Decay Constants of $B$ and $D$ Mesons

Details A Lattice Computation of the Decay Constants of $B$ and $D$ Mesons A Lattice Computation of the Decay Constants of $B$ and $D$ Mesons

1993-06-12

arxiv.org/abs/hep-lat/9306009v1

Phys.Rev. D49 (1994) 2536-2566

Physics

High Energy Physics

High Energy Physics - Lattice

72 pages (tex file, mtexsis macros and 19 postscript figures bundled by "uufiles"), UW/PT-93-06

Scientific paper

10.1103/PhysRevD.49.2536

A lattice calculation of the pseudoscalar decay constant of heavy-light mesons is reported. Results are obtained (in the quenched approximation) from lattices at $\beta=6.3$ through a procedure that interpolates between the static approximation of Eichten and the conventional ("heavy" Wilson fermion) method. The previously observed discrepancy between these two approaches has been resolved: we find the scaling quantity $f\sqrt{M}$ to be significantly smaller than previous calculations had indicated ({\it e.g.} at $\beta=6.0$); in addition, we discuss a modification which is required in normalizing the conventional amplitude to correct for large-$am$ lattice errors. This change guarantees that $f\sqrt{M}$ will smoothly approach its value in the static limit. From the numerical interpolation of the static and intermediate-mass results, we find, in units of MeV, $f_B=187(10)\pm34\pm15$, $f_{B_s}=207(9)\pm34\pm22$, $f_D=208(9)\pm35\pm12$ and $f_{D_s}=230(7)\pm30\pm18$, where the first error is statistical and the second two are estimates of systematics due to 1) fitting and large-$am$ effects and 2) scaling. In addition, using lattices at $\beta=6.3$, $\beta=6.0$ and $\beta=5.7$ and extrapolating to the limit of zero lattice spacing, we have computed $f_K/f_\pi = 1.08\pm.03\pm.08$ in the quenched approximation.

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