B-c mesons in a Bethe-Salpeter model

We apply our Bethe-Salpeter model for mesons to the B-c family with parameters fixed in our previous investigation. We evaluate the mass of the pseudoscalar B-c meson as 6.356 and 6.380 GeV/c(2) and the lifetime as 0.47 and 0.46 ps, respectively, in two reductions of the Bethe-Salpeter equation, in good agreement with the recently reported mass of 6.40+/-0.39 (stat) +/-0.13 (syst) GeV/c(2) and Lifetime of 0.46(-0.16)(+0.18) (stat) +/-0.03 (syst) ps by the CDF Collaboration. We evaluate the decay constant of the B-c meson and compare different contributions to its decay width. {[}S0556-2821(99)02203-1].