Rare bs - decays in the covariant quark model

Аннотация

Considering the surge of great interest to the problem of CP violation recently observed in a Bs  Bs system, decays of Bs to D  D and color suppressed decay Bs → J/ψ φ attracted the attention of both theorists and experimentalists. We find new values for the covariant quark model parameters (with built-in infrared confinement) in the meson sector by fitting the leptonic decay constants and a number of electromagnetic decays, and then evaluate in a parameter-free way the form factors of B(Bs) → P(V) transitions within an entire kinematic range of the momentum transfer. Our results are applied to calculating the widths of nonleptonic Bs decays to , * * S S S S S S DD D D  DD  and * * S S D D  . The largest contribution to ΔΓ for s s B  B system comes from these modes. The nonleptonic decay Bs → J/ψφ is also considered. Though this decay mode is color suppressed it has important implications in the search for possible CP-violating novel physics effects in s s B  B mixing.