First observation of correlations between high transverse momentum charged particles in events from the CERN proton-antiproton collider

Abstract In events at centre of mass energy 540 GeV from the CERN p p collider, we have found clear evidence for correlations in rapidity and azimuthal angle between high transverse momentum charged particles. These correlations increase with transverse momentum and are much stronger than the general two-particle correlations in minimum bias events. By analogy to ISR results, a qualitative interpretation in terms of hard scattering and fragmentation of partons is discussed.