Search For The Weak Decay Of A Lightly Bound H-0 Dibaryon

We present results of a search fur a new form of hadronic matter, a six-quark, dibaryon state called the H-0, a state predicted to exist in several theoretical models. Analyzing data collected by experiment E799-II at Fermilab, we searched for the decay H-0 --> Lambda p pi(-) and found no candidate events. We place an upper limit on [B(H-0 --> Lambda p pi(-))d sigma(H)/d Omega]/(d sigma equivalent to/d Omega) and; in the context of published models, exclude the region of lightly bound mass states just below the Lambda Lambda mass threshold, 2.194 < M-H < 2.231 GeV/c(2), with lifetimes from similar to 5 X 10(-10) sec to similar to 1 X 10(-3) sec.