Light-front quark model analysis of exclusive 0- → 0- semileptonic heavy meson decays

We present the analysis of exclusive 0(-) --> 0(-) semileptonic heavy meson decays using the constituent quark model based on the light-front quantization. Our model is constrained by the variational principle for the well-known linear plus Coulomb interaction motivated by QCD. Our method of analytic continuation to obtain the weak form factors avoids the difficulty associated with the contribution from the nonvalence quark-antiquark pair creation. Our numerical results for the heavy-to-heavy and heavy-to-light meson decays are in a good agreement with the available experimental data and the lattice QCD results. In addition, our model predicts the two unmeasured mass spectra of S-1(0)(b (b) over bar) and S-3(1)(b (s) over bar) systems as M-b (b) over bar = 9657 MeV and M-b (s) over bar = 5424 MeV. (C) 1999 Published by Elsevier Science B.V. All rights reserved.