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

We study the four-body exclusive semileptonic baryonic $\bar{B}$ decays of $B^{-}\to p\bar{p}{\mathrm{\ell }}^{-}{\bar{\nu }}_{\mathrm{\ell }}$ ($\mathrm{\ell }=e,\mu ,\tau$) in the standard model. We find that their decay branching ratios are about $(1.0, 1.0,0.5)\times 10^{-4}$, respectively. In particular, the electron mode is close to the corresponding CLEO’s upper limit of $5.2\times {10}^{-3}$, while all results are about one or two orders of magnitude larger than the previous estimated 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 observe these exclusive four-body modes.