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We searched for the appearance of pi+pi- pairs with invariant mass greaterthan 648 MeV in a neutral beam. Such an observation could signify the decay ofa long-lived light neutral particle. We find no evidence for this decay. Ournull result severely constrains the existence of an R0 hadron, which is thelightest bound state of a gluon an

Search for Light Gluinos via the Spontaneous Appearance of π+π- Pairs with an 800 GeV/c Proton Beam at Fermilab