High-multiplicity processes

Abstract

Asymptotic expansions in the variablev=n/logE (wheren is the secondary multiplicity andE is the primary energy) are given for the phase space and for an amplitude satisfying some general conditions. The leading term in the momentum distribution is found to be independent of further details of the dynamics except for one constant, then andE dependence of which is determined only by some dynamic properties of the system. The predicted distribution agrees with experimental data on 25 GeVπ−-p interactions. A study of these data allows us to predict dσ/d3p for arbitrary primary-energy and high-multiplicity interactions. A thermodynamic picture equivalent to our results is given.