摘要
We study the charmless two-body decays of b baryons (Λb, Ξb-, Ξb0). We find that B(Ξb-→Λρ-)=(2.08-0.51+0.69)×10-6 and B(Ξb0→Σ+M-)=(4.45-1.09+1.46,11.49-2.9+3.8,4.69-0.79+1.11,2.98-0.51+0.76)×10-6 for M-=(π-,ρ-,K-,K∗-), which are compatible with B(Λb→pπ-,pK-). We also obtain that B(Λb→Λω)=(2.30±0.10)×10-6, B(Ξb-→Ξ-φ,Ξ-ω)≃B(Ξb0→Ξ0φ,Ξ0ω)=(5.35±0.41,3.65±0.16)×10-6 and B(Ξb-→Ξ-η(′))≃B(Ξb0→Ξ0η(′))=(2.51-0.46+0.70,2.99-0.57+1.16)×10-6. For the CP-violating asymmetries, we show that ACP(Λb→pK∗-)=ACP(Ξb-→Σ0(Λ)K∗-)=ACP(Ξb0→Σ+K∗-)=(19.7±1.4)%. Similar to the charmless two-body Λb decays, the Ξb decays are accessible to the LHCb detector.