Light Gluino Search for Decays Containing π + π − or π 0 from a Neutral Hadron Beam at Fermilab

We report on two null searches, one for the spontaneous appearance of ππ pairs, another for a single π, consistent with the decay of a long-lived neutral particle into hadrons and an unseen neutral particle. For the lowest level gluon-gluino bound state, known as the R, we exclude the decays R → ππγ̃ and R → πγ̃ for the masses of R and γ̃ in the theoretically allowed range. In the most interesting R mass range, ≤ 3 GeV/c, we exclude R lifetimes from 3 × 10 seconds to as high as 10 seconds, assuming perturbative QCD production for the R. PACS numbers: 13.85.Rm, 13.25.Es, 14.40.Aq, 14.80.Ly Typeset using REVTEX