SU(3) FLAVOR BREAKING IN HADRONIC MATRIX-ELEMENTS FOR B-(B)OVER-BAR OSCILLATIONS - ART. NO. 014501

Results in the quenched approximation for SU(3) breaking ratios of the heavy-light decay constants and the Delta F=2 mixing matrix elements are reported. Using lattice simulations at 6/g(2)=5.7, 5.85, 6.0, and 6.3, we directly compute the mixing matrix element M-hl=[(P) over bar( hl)\(h) over bar gamma(mu)(1-gamma(5))l (h) over bar gamma(mu)(1-gamma (5))l\P-hl]. Extrapolating to the physical B meson states, B-0 and B-s (0), we obtain M-bs/M-bd=1.76(10)(-42)(+57) in the continuum limit. Th e systematic error includes the errors within the quenched approximati on but not the errors of quenching. We also obtain the ratio of decay constants, f(bs)/f(bd)=1.17(2)(-6)(+12). For the B parameters we find B-bs(2 GeV)=B-bd(2 GeV)=1.02(13); we cannot resolve the SU(3) breaking effects in this case. [S0556-2821(98)01313-7].