Two-Particle Quantum-Number Correlations in 400-GeV/cProton-Nucleus Collisions

Abstract

We have measured two-particle quantum-number correlations in 400-GeV/c protonnucleus collisions. A double-arm spectrometer was used to detect two charged particles produced near rapidity ;y c#m# = -0.4 in the proton-nucleon center-of-mass system. In proton-beryllium collisions we observe positive pp and K + K~ correlations which are independent of the transverse momenta of the particles over the range 1 ^p ±^ 1.8 GeV/c* These correlations are weaker in proton-lead interactions.