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 1S0(bb̄) and 3S1(bs̄) systems as Mbb̄=9657 MeV and Mbs̄=5424 MeV.