  The energies of different angular momentum states of a heavy-light meson were
measured on a lattice in PRD 58, 34506 (1998) . We have now continued this
study using several different lattices, quenched and unquenched, that have
different physical lattice sizes, clover coefficients, hopping parameters and
quark-gluon couplings. The heavy quark is taken to be infinitely heavy, whereas
the light quark mass is approximately that of the strange quark. By
interpolating in the heavy and light quark masses we can thus compare the
lattice results with the B_s meson. Most interesting is the lowest P-wave B_s
state, since it is possible that it lies below the BK threshold and hence is
very narrow. Unfortunately, there are no experimental results on P-wave B_s
mesons available at present.
  In addition to the energy spectrum, we measured earlier also vector (charge)
and scalar (matter) radial distributions of the light quark in the S-wave
states of a heavy-light meson on a lattice (PRD 65, 014512 (2002) and Eur.
Phys. J. C 28, 79 (2003)). Now we are extending the study of radial
distributions to P-wave states.
