Search for long-lived charge +2 hadrons

We have searched for the production of long-lived $R-{\Delta }^{++}$ hadrons, which contain a gluino in addition to three up quarks, in $\mathrm{pp}$, ${\pi }^{+}p$, and $K^{+}p$ interactions at 147 GeV/c. For $R-{\Delta }^{++}$'s of lifetime greater than ${10}^{-9\mathrm{}}$ sec, and laboratory momentum greater than 2 GeV/c, we place 90%-confidence-level upper limits of 6.1 μ b in $\mathrm{pp}$ collisions, 4.4 μ b in ${\pi }^{+}p$, and 29 μ b in $K^{+}p$.