B meson decays to baryons in the diquark model

We study B meson decays to two charmless baryons in the diquark model, including strong and electroweak penguins as well as the tree operators. It is shown that penguin operators can enhance B → B_sB̄ considerably, but affect B̄ → B₁B̄₂ only slightly, where B_(1,2) and B_s are non-strange and strange baryons, respectively. The γ dependence of the decay rates due to tree-penguin interference is illustrated. In principle, some of the B _sB̄ modes could dominate over B₁B̄₂ for γ > 90°, but in general the effect is milder than their mesonic counterparts. This is because the O₆ operator can only produce vector but not scalar diquarks, while the opposite is true for O₁ and O₄. Predictions from the diquark model are compared to those from the sum rule calculation. The decays B̄ → B_sB̄ _s and inclusive baryonic decays are also discussed.