Final-State Interaction Effects in InclusiveγandV0Production frompdInteractions at 18 GeV/c

Direct evidence is presented for final- (and/or initial-) state interaction effects in 18 GeV/c $\mathrm{pd}$ reactions involving inclusive $\gamma$ and $V^0$ production. This evidence is manifested as an excessive number of protonlike events as compared to the number of neutronlike events; an asymmetric distribution in center-of-mass longitudinal $V^0$ momentum for the protonlike events; and strong spectator-proton production-angle asymmetry correlated with high-momentum spectators.