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