arXiv:hep-lat/9704002·v1·High Energy Physics — Lattice

Quenched Hadron Spectrum and Decay Constants on the lattice

Abstract

In this talk we present the results obtained from a study of $O (2000)$ (quenched) lattice configurations from the APE collaboration, at $6.0 \leq β \leq 6.4$ , using both the Wilson and the SW-Clover fermion action. We determine the light hadronic spectrum and the meson decay constants. For the light-light systems we find an agreement with the experimental data of $\sim 5$ for mesonic masses and $\sim 10$ for baryonic masses and pseudoscalar decay constants; a larger deviation is present for the vector decay constants. For the heavy-light decay constants we find $f_{D_{s}} = 237 \pm 16 M e V, f_{D} = 221 \pm 17 M e V (f_{D_{s}} / f_{D} = 1.07 (4)), f_{B_{s}} = 205 \pm 35 M e V, f_{B} = 180 \pm 32 M e V (f_{B_{s}} / f_{B} = 1.14 (8))$ , in good agreement with previous estimates.

Comments: 8 pages, latex, Talk given at XXV ITEP Winter School of Physics, Moscow - Russia, 18-27 Feb 1997