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We systematically revisit the baryonic four-body semileptonic decays of $B^-\to {\bf B}\bar{\bf B}'\ell^- \bar{\nu}_{\ell}$ by the perturbative QCDcounting rules with ${\bf B}$ representing octet baryons and $\ell=e,\mu$. Westudy the transition form factors of $B^- \to {\bf B} \bar{\bf B}'$ in thelimit of $(p_{\bf B}+p_{\bar{\bf B}'})^2 \to \infty $ with the three-body$\bar{B}\to {\bf B}\bar{\bf B}' M$ and $B^- \to p\bar{p} \mu^- \bar{\nu}_{\mu}$data along with $SU(3)_f$ flavor symmetry. We calculate the decay branchingratios and angular asymmetries as well as the differential decay branchingfractions of $B^- \to p \bar{p} \ell^- \bar{\nu}_{\ell}$. In particular, wefind that our new result of ${\cal B}( B^- \to p \bar{p} \ell^-\bar{\nu}_{\ell})=(5.21\pm0.34)\times 10^{-6}$, which is about one order ofmagnitude lower than the previous theoretical prediction of $(10.4\pm2.9)\times10^{-5}$, agrees well with both experimental measurements of$(5.8^{+2.6}_{-2.3})\times 10^{-6}$ and $(5.3\pm0.4)\times 10^{-6}$ by theBelle and LHCb Collaborations, respectively. We also evaluate the branchingratios and angular asymmetries in other channels of $B^- \to {\bf B}\bar{\bfB}\ell^- \bar{\nu}_{\ell}$, which can be tested by the ongoing experiments atLHCb and BelleII.

Revisiting semileptonic $B^-\to p\bar{p} \ell^- \bar{\nu}_{\ell}$ decays