Forward-backward multiplicity correlations caused by centrality fluctuations in high-energy heavy-ion collisions

作者：He, Ronghua^*; Qian, Jing; Huo, Lei

来源：PHYSICAL REVIEW C, 2016, 93(4): 044918.

DOI：10.1103/PhysRevC.93.044918

• CHARGED-PARTICLE CORRELATIONS
• RANGE RAPIDITY CORRELATIONS
• COLOR GLASS CONDENSATE
• MONTE-CARLO MODEL
• PBARP-COLLISIONS
• LONG
• PP
• PERCOLATION
• SIMULATION
• QUARK

We consider that most of the long-range forward-backward multiplicity (FB) correlations in high energy A-A collisions are caused by the centrality fluctuation, and this phenomenon interferes with the measurement of the dynamical correlations greatly. We investigate the relationship between FB correlation strength and centrality by a Monte Carlo simulation and a derivation which are tested by A MultiPhases Transport (AMPT) model in Au+Au collisions at root(NN)-N-S = 200 GeV. We compare the FB correlation strengths of AMPT model with the results of the derivation at root(NN)-N-S = 7.7 to 200 GeV. A comparison between the default AMPT model and string melting AMPT model with different partonic scattering sections is made. As a result, we consider that the FB correlation strengths may be dominated by the mixing of different centrality events, and the short-range correlation may be overwhelmed for the most central collisions.

• 出版日期2016-4-28
• 单位哈尔滨工业大学