  The signals in high mass dilepton spectroscopy with nucleus-nucleus
collisions at collider energies are superimposed on a generally large
combinatorial background. Because this background contains a significant
correlated like-sign component originating from B meson decays, the "like-sign"
method to determine the background is inappropriate. We discuss strategies to
deal with the correlations in the background. By taking advantage of the B
meson oscillation mechanism and of the particular features of B meson decays a
new method to measure the bbbar production cross-section is proposed.
