A lattice NRQCD computation of the bag parameters for $\Delta B$ = 2 operators

Abstract

We present an update of our NRQCD calculation of $B_B$ at $\beta$=5.9 with increased statistics. We also discuss a calculation of $B_S$, which is relevant to the width difference in the $B_s-{\bar{B}}_s$ mixing.

Comments: LATTICE99 (Heavy Quarks), 3 pages, 2 figures, espcrc2.sty