Pathways to Rare BaryonicBDecays

We point out new ways to search for charmless baryonic $B$ decays and suggest that enhanced baryon production is favored by reduced energy release on the baryon side. Thus $B\to {\eta }^{\prime }+\mathrm{baryon}\mathrm{pairs}$ might be larger than $K\pi /\pi \pi$ modes; the argument may be extended to $B\to \gamma {+X}_s$, and perhaps to $\ell \nu {+X}_u$. Guess estimates give some branching ratios in the ${10}^{-3\mathrm{}}$– ${10}^{-6\mathrm{}}$ range, with confidence gained from the recent observation of $B\to {\overline{D}}^{*}p\overline{n}$, ${\overline{D}}^{*}p\overline{p}\pi$ not far below ${\overline{D}}^{*}\pi$ and ${\overline{D}}^{*}\rho$ rates. Observation of modes proposed here would help clarify the dynamics of weak decays involving baryons, while the self-analyzing prowess of $\Lambda$ decay can be helpful in $\mathrm{CP}$- and $T$-violation studies.