Form factors for semileptonic, nonleptonic, and rare B ( B s ) meson decays

We provide new values for the model parameters of the covariant constituent quark model (with built-in infrared confinement) in the meson sector by a fit to the leptonic decay constants and a number of electromagnetic decays. We then evaluate, in a parameter-free way, the form factors of the B(B sub(s)) arrow right P(V) transitions in the full kinematical region of momentum transfer. As an application of our results, we calculate the widths of the nonleptonic B sub(s) decays into (ProQuest: Formulae and/or non-USASCII text omitted) and (ProQuest: Formulae and/or non-USASCII text omitted). These modes give the largest contribution to Delta [Gamma] for the B sub(s) -B sub(s) system. We also treat the nonleptonic decay B sub(s) arrow right J/[psi][varphi]. Although this mode is color-suppressed, this decay has important implications for the search of possible CP-violating new-physics effects in B sub(s)-B sub(s) mixing.