Urbaryon model approach to unified understanding of large and small P /sub T/ spectra

Single-particle distributions in the entire Peyrou plot at CERN-PS approximately ISR energies are unifiedly described by the whole-region formula, which incorporates both parton model results at large p/sub T / and all of the Mueller-Regge forms at small p/sub T/. The quantum number dependence of the distributions is explained by the formula as due to the intimate relation between the energy-momentum flow and the quantum-number flow carried by valence urbaryons. A field theoretical basis of the formula is provided by a covariant model of the hadron- urbaryon amplitude which is parametrized in terms of valence urbaryon lines and pair effects. Two-body reactions at all angles are also described by the formula as the exclusive limit of inclusive reactions. The construction of a formula for inclusive two-particle distribution is briefly discussed. (30 refs).