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We study the four-body exclusive semileptonic baryonic $\bar B$ decays of$B^-\to p\bar p \ell^- \bar\nu_{\ell}$ ($\ell=e,\mu,\tau$) in the standardmodel. We find that their decay branching ratios are about $(1.0,1.0,0.5)\times 10^{-4}$, respectively. In particular, the electron mode isclose to the corresponding CLEO's upper limit of $5.2\times 10^{-3}$, while allresults are about one or two orders of magnitude larger than the previousestimated values for the inclusive modes of $\bar B\to {\bf B\bar B'}\ell \bar\nu$. Clearly, both B-factories of Belle and BaBar should be able to observethese exclusive four-body modes.

Semileptonic $B-\to p\bar{p} \ell-\bar{\nu}_\ell$ decays