O(1 M-3) EFFECTS FOR HEAVY-LIGHT MESONS IN LATTICE NRQCD - ART. NO. 074506/

The masses of S-1(0) and S-3(1) mesons containing a single heavy quark are computed in the quenched approximation. The light quark action an d gauge field action are both classically improved and tadpole improve d, and the couplings to the heavy quark are organized by the 1/M expan sion of tadpole-improved NRQCD. At each of two lattice spacings, near 0.22 fm and 0.26 fm, meson masses are obtained for heavy quarks spanni ng the region between charmed and bottom mesons. Results up to O(1/M), O(1/M-2) and O(1/M-3) are displayed separately, so that the convergen ce of the heavy quark expansion can be discussed. Also, the effect of each term in the O(1/M-3) contribution is computed individually. For b ottom mesons the 1/M expansion appears to be satisfactory, but the sit uation for charmed mesons is less clear. [S0556-2821(98)03619-4].