We present the current status of our ongoing calculations of pseudoscalar meson decay constants for mesons that contain one light and one heavy quark ( ƒ B, ƒ Bs, ƒ D, ƒ Ds). We are currently generating new gauge configurations that include dynamical quarks and calculating the decay constants. In addition, we have several new results for the static approximation. Those results, as well as several refinements to the analysis, are new since Lattice '96. Our current (still preliminary) value for ƒ B is 156 ± 11 ± 30 ± 14 MeV, where the first error is from statistical and fitting errors, the second error is an estimate of other systematic errors within the quenched approximation and the third error is an estimate of the quenching error. For the ratio ƒ Bs,/ ƒ B, we get 1.11 ± 0.02 ± 0.03 ± 0.07.
Nuclear Physics B Proceedings Supplements
- Pub Date:
- January 1998
- High Energy Physics - Lattice
- 8 pages, 9 figures, LaTeX, uses espcrs2, epsf, Invited talk presented by S. Gottlieb at Lattice QCD on Parallel Computers, University of Tsukuba, March, 1997, to appear in the proceedings