Search for strange baryonium states in p-bard interactions at 8.9 GeV/c

A search for SU(3) manifestly exotic Q2Q-bar 2 baryonium states in antiproton-deuterium interactions was carried out at the SLAC 40-in. hybrid bubble-chamber facility. The I = (3/2, S = 1 channel, X-, produced in conjunction with a forward produced neutral antikaon was studied. Such X- states would decay into an antihyperon and a baryon. The fast forward K-bar 0 was detected in a three-view segmented calorimeter placed downstream of the bubble chamber and used as part of the trigger. Upper limits of 0.50--1.63 μb are reported for the X-→Lambda-barnπ-, Sigma-bar -n, Lambda-barpπ-π-, Sigma-bar -pπ-, Sigma-bar /sup +- /nπ/sup minus-or-plus/π- exclusive channels based upon ≤13 events per channel