Search for the Weak Decay of an H Dibaryon

Abstract

We have searched for a neutral $H$ dibaryon decaying via $H\to \Lambda n$ and $H\to {\Sigma }^{0}n$. Our search has yielded two candidate events from which we set an upper limit on the $H$ production cross section. Normalizing to the inclusive $\Lambda$ production cross section, we find $(d{\sigma }_H/d\Omega )/(d{\sigma }_{\Lambda }/d\Omega )<6.3\times 10^{-6}$ at 90% C.L., for an $H$ of mass $\approx$ 2.15 GeV/$c^2$.

11 pages, 6 postscript figures, epsfig, aps, preprint, revtex

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