Particle Correlations in Jets

Abstract

We study particle correlations in high energy jets by comparing the measured energy-energy correlator (EEC) with that constructed from two individual energy flows with respect to the jet axis. This comparison demonstrates that the genuine correlations are stronger at moderate/large angle across all jet energies, indicating that they are coming from correlated splitting. Meanwhile, at small angle, they increase with jet energy, exhibiting a peculiar pattern that can be used to explore jet energy loss in heavy ion collisions. This method will provide a unique tool to disentangle different physics, by comparing the genuine correlations in jet EEC between heavy-ion collisions and proton-proton collisions.

arXiv commentThe version accepted by the Physical Review Letters