Search for $��^0 \to ��_��\bar��_��$ Decay in LSND

We observe a net beam-excess of $8.7 \pm 6.3$ (stat) $\pm 2.4$ (syst) events, above 160 MeV, resulting from the charged-current reaction of $��_��$ and/or $\bar��_��$ on C and H in the LSND detector. No beam related muon background is expected in this energy regime. Within an analysis framework of $��^0 \to ��_��\bar��_��$, we set a direct upper limit for this branching ratio of $��(��^0 \to ��_��\bar��_��) / ��(��^0 \to all) < 1.6 \times 10^{-6}$ at 90% confidence level.
4 pages, 4 figures