Azimuthal Correlations of High-Energy Collision Products

Experimental distributions of azimuthal angles between particles produced in $\mathrm{pp}$ and $\mathrm{pd}$ collisions at 28 $\frac{\mathrm{GeV}}{c}$ and $K^{-}p$ collisions at 9 $\frac{\mathrm{GeV}}{c}$ are presented and studied. A simple protostatistical model describes the over-all azimuthal distributions quite well. Other models are also considered. We show that the azimuthal distribution for reactions of fixed charged prong number may be used to estimate the average number of missing neutrals, and we study the distributions of a collective variable designed to test for a preferred transverse direction in multiparticle events.