Semileptonic baryonic B decays

Abstract

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