Search for the Weak Decay of an H Dibaryon

Abstract

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