Collective sea-gull effect in π+p interactions at 250 GeV/c

Abstract A collective “sea-gull” effect is observed for a system of fast hadrons produced in the fragmentation regions of nondiffractive π + p -interactions at 250 GeV/ c . The effect is not reproduced by the FRITIOF fragmentation model in its details. It is demonstrated that hard-like processes, both in the collision phase and in the fragmentation phase, are not properly treated in the model.