HEAVY-QUARK SPECTROSCOPY ON THE LATTICE

We present the results of a calculation of the B(s)-B(d) and B*-B mass differences and of the mass of the LAMBDA(B) on the lattice, obtained using the expansion in inverse powers of the heavy-quark mass. We find M(B)s - M(B)d = (71 +/- 13 - 16) MeV, M(LAMBDA)B - M(B)d = (720 +/- 160 - 130) MeV, and M(B*)2 - M(B)2 = (0.19 +/- 0.04 - 0.07) MeV2. The last error in the evaluation of the mass differences comes from the calibration of the lattice spacing, We have also studied the vector-pseudoscalar mass splittings for heavy-light and heavy-heavy mesons with the full (but quenched) propagator for the heavy-quark, at beta = 6.2. The splittings are much smaller than the physical values, and possible reasons for this are discussed.