Semileptonic baryonic B decays

Abstract We study the semileptonic $$B\rightarrow {\textbf{B}{\bar{\mathbf{B'}}}}L{\bar{L}}'$$ B → ′ ¯ L decays with $$\textbf{B}{\bar{\textbf{B}}'}$$ ( $$L{\bar{L}}'$$ ) representing a baryon (lepton) pair. Using new determination of {\textbf{B}{\bar{\mathbf{B'}}}}$$ transition form factors, we obtain $$\mathcal{B}(B^-\rightarrow p{\bar{p}} \mu ^-{\bar{\nu }}_\mu =(5.4\pm 2.0)\times 10^{-6}$$ ( - p μ ν ) = 5.4 ± 2.0 × 10 6 agreeing current data. Besides, \Lambda {\bar{p}} \nu {\bar{\nu }})=(3.5\pm 1.0)\times 10^{-8}$$ Λ 3.5 1.0 8 is calculated to be 20 times smaller than previous prediction. In particular, predict $$\mathcal{B}({\bar{B}}^0_s\rightarrow p{\bar{\Lambda }} e^- }}_e,p{\bar{\Lambda ^- ,p{\bar{\Lambda \tau }}_\tau =(2.1\pm 0.6,2.1\pm 0.6,1.7\pm s 0 e , τ 2.1 0.6 1.7 and {\bar{\Lambda }})=(0.8\pm 0.2)\times 0.8 0.2 , which can accessible LHCb experiment.