Perhaps a Stable Dihyperon

Abstract

In the quark bag model, the same gluon-exchange forces which make the proton lighter than the $\Delta \mathrm{}\left(1236\right)\mathrm{}$ bind six quarks to form a stable, flavor-singlet (with strangeness of - 2) $J^P=0^{+}$ dihyperon ($H$) at 2150 MeV. Another isosinglet dihyperon ($H^{*}$) with $J^P=1^{+}$ at 2335 MeV should appear as a bump in $\Lambda \Lambda$ invariant-mass plots. Production and decay systematics of the $H$ are discussed.