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

Abstract

We search for the rare flavor-changing neutral current process $B^{-}\to \Lambda \overline{p}\nu \overline{\nu }$ using data from the BABAR experiment. A total of 424 fb${}^{-1}$ of $e^{+}{e}^{-}$ collision data collected at the center-of-mass energy of the ${\rm Y}$(4S) resonance is used in this study, 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 the expected background contribution under a null signal hypothesis, resulting in an upper limit of $\mathcal{B}(B^{-}\to \Lambda \overline{p}\nu \overline{\nu })<3.0\times 10^{-5}$ at the $90\%$ confidence level.

arXiv comment10 pages, 7 figures

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