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We search for the rare flavor-changing neutral current process $B^- \to\Lambda {\overline p} \nu{\overline{\nu}}$ using data from the BABARexperiment. A total of 424 fb$^{-1}$ of $e^+e^-$ collision data collected atthe center-of-mass energy of the $\Upsilon$(4S) resonance is used in thisstudy, corresponding to a sample of ${(471 \pm 3) \times 10^{6}}$$B\overline{B}$ pairs. Signal $B^- \to \Lambda {\overline p}\nu{\overline{\nu}}$ candidates are identified by first fully reconstructing a$B^+$ decay in one of many possible exclusive decays to hadronic final states,then examining detector activity that is not associated with this reconstructed$B^+$ decay for evidence of a signal $B^- \to \Lambda {\overline p}\nu{\overline{\nu}}$ decay. The data yield is found to be consistent with theexpected background contribution under a null signal hypothesis, resulting inan upper limit of ${{\cal B} (B^- \to \Lambda {\overline p}\nu{\overline{\nu}}) < 3.0\times 10^{-5}}$ at the $90\%$ confidence level.

Search for $B^- \to \Lambda \bar p \nu \bar\nu$ with the BABAR experiment