System-size scan of dihadron azimuthal correlations in ultra-relativistic heavy ion collisions

✍ Scribed by S. Zhang; Y.H. Zhu; G.L. Ma; Y.G. Ma; X.Z. Cai; J.H. Chen; C. Zhong

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 721 KB
• Volume: 860
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/j.nuclphysa.2011.05.008

✦ Synopsis

System-size dependence of dihadron azimuthal correlations in ultra-relativistic heavy ion collision is simulated by a multi-phase transport model. The structure of correlation functions and yields of associated particles show clear participant path-length dependences in collision systems with a partonic phase. The splitting parameter and root-mean-square width of away-side correlation functions increase with collision system size from 14 N + 14 N to 197 Au + 197 Au collisions. The double-peak structure of away-side correlation functions can only be formed in sufficient "large" collision systems under partonic phase. The contrast between the results with partonic phase and with hadron gas could suggest some hints to study onset of confinement.