# Collision system size dependence of dihadron azimuthal correlations in ultra-relativistic heavy ion collisions - Nuclear Theory

Abstract: The system size dependence of dihadron azimuthal correlations inultra-relativistic heavy ion collision is simulated by a multi-phase transportmodel. The structure of correlation functions and yields of associatedparticles show clear participant path-length dependences in collision systemswith a partonic phase. The splitting parameter $D$ and Root Mean Square Width$\Delta \phi {rms}$ of away side correlation functions increase withcollision system size from $^{14}$N+$^{14}$N to $^{197}$Au+$^{197}$Aucollisions. The double-peak structure of away side correlation functions canonly be formed in sufficient -large- collision systems. These propertiesprovide some hints to study onset of deconfinement, which is related to the QCDphase boundary and QCD critical point, by an energy-size scan.

Author: S. Zhang, Y. H. Zhu, G. L. Ma, Y. G. Ma, X. Z. Cai, J. H. Chen, C. Zhong

Source: https://arxiv.org/