Correlation between the pionization region and the fragmentation region in high energy proton-proton collisions

Abstract Measurements are reported of two-particle correlations in high energy proton-proton collisions with one particle in the pionization region and the other a proton in the fragmentation region. The correlation function is independent of x of the fragmentation proton for 0.55 ⪅ x ⪅ 0.9 and rises at small x . There is an indication that the correlation is an energy-independent function of x . The measurements for two values of the rapidity of the pionization particle give similar results.