Characteristic features of multiparticle systems produced in proton-proton collisions at 360 GeV/c

Bubble chamber pictures taken by the Rapid Cycling Bubble Chamber were analyzed and simultaneously counter data was obtained by the European Hybrid Spectrometer. The experiment was carried out at a proton momentum of 360 GeV/c. The forward fast protons were identified with the aid of the Identification of Secondaries by Ionization Sampling (ISIS) and the leading particle effect is carefully removed. After classifying proton-proton (pp) inelastic events into two categories, the diffraction dissociation (DD) and the central production (CP), the average charged multiplicities and their moments were obtained as a function of the missing mass M sub(X) defined with respect to the leading particles. The results were compared with those given as functins of the hadron exicted mass W in neutrino-proton deep inelastic scattering (DIS). It is clear that the comparison between pp scattering and DIS should be made at the same value of kinematically equivalent quantities M sub(X) and W, not in terms of the conventional center-of-mass energy ssup(1/2). We find that there exists a close similarity among observed quantities in DD, CP and DIS, which implies a unified nature of multiparticle-production processes at very high energies. (Kubozono, M.)