SU(3) Flavor Breaking in Hadronic Matrix Elements for $B - \bar B$ Oscillations

Details SU(3) Flavor Breaking in Hadronic Matrix Elements for $B - \bar B$ Oscillations SU(3) Flavor Breaking in Hadronic Matrix Elements for $B - \bar B$ Oscillations

1996-08-30

arxiv.org/abs/hep-lat/9609005v1

Nucl.Phys.Proc.Suppl. 53 (1997) 382-385

Physics

High Energy Physics

High Energy Physics - Lattice

Poster presented at LATTICE96(heavy quarks). LaTeX, uses espcrc2.sty and epsf, 4 pages, 4 postscript figures included

Scientific paper

10.1016/S0920-5632(96)00665-2

We present an analysis, using quenched configurations at $6/g^2=$5.7, 5.85, 6.0, and 6.3 of the matrix element $\MP\equiv\langle \bar P_{hl}|\bar h \gamma_\mu (1-\gamma_5)l \bar h \gamma_\mu(1-\gamma_5)l|P_{hl}\rangle$ for heavy-light pseudoscalar mesons. The results are extrapolated to the physical $B$ meson states, $\Bd$ and $\Bs$. We directly compute the ratio $\MS/\MB$, and obtain the preliminary result $\MS/\MB=1.54(13)(32)$. A precise value of this SU(3) breaking ratio is important for determining $V_{td}$ once the mixing parameter $x_s$ for $\Bs-\bar\Bs$ is measured experimentally. We also determine values for the corresponding B parameters, $B_{bs}(2 \rm{GeV})=B_{bd}(2 \rm{GeV})=1.02(13)$, which we cannot distinguish in the present analysis.

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