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

Ronghua He, Jing Qian, and Lei Huo
Phys. Rev. C 93, 044918 – Published 28 April 2016

Abstract

We consider that most of the long-range forward-backward multiplicity (FB) correlations in high energy AA 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 sNN=200 GeV. We compare the FB correlation strengths of AMPT model with the results of the derivation at sNN = 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.

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  • Received 1 February 2016
  • Revised 7 March 2016

DOI:https://doi.org/10.1103/PhysRevC.93.044918

©2016 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Ronghua He1, Jing Qian1,2, and Lei Huo1

  • 1Department of Physics, Harbin Institute of Technology, Harbin 150001, People's Republic of China
  • 2Department of Physics, The Ohio State University, Columbus, Ohio 43210-1117, USA

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Issue

Vol. 93, Iss. 4 — April 2016

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