Single-Particle Momentum Distribution at High Energies and Concept of Partition Temperature

A concept of partition temperature is introduced in high-energy collisions. It is a natural mathematical consequence of the Darwin-Fowler method, and neither requires nor implies thermal equilibrium. A collision at a given incoming energy is described as an incoherent superposition of collisions with different partition temperatures. Angular distributions are then presented for $\sqrt{s}=540$ GeV collisions.