Rapidity Density Distributions In Antiproton Proton Collisions

Data on the density of charged particles in rapidity space for annihilation and non-annihilation p̄p interactions at 7.3 and 12 GeV/c are reported. It is shown that the central rapidity density for non-annihilation processes is a simple linear function of ln(s) from these low energies up to p̄p collider energies (s=540 GeV). Significant differences in density distributions for p̄p and e−e+ annihilations at comparable energies are found.