Forward-backward multiplicity fluctuation and longitudinal harmonics in high-energy nuclear collisions

Jiangyong Jia, Sooraj Radhakrishnan, and Mingliang Zhou
Phys. Rev. C 93, 044905 – Published 18 April 2016

Abstract

An analysis method is proposed to study the forward-backward (FB) multiplicity fluctuation in high-energy nuclear collisions, built on the earlier work of Bzdak and Teaney [Phys. Rev. C 87, 024906 (2013)]. The method allows the decomposition of the centrality dependence of average multiplicity from the dynamical event-by-event (EbyE) fluctuation of multiplicity in pseudorapidity. Application of the method to AMPT (A Multi-Phase Transport model) and HIJING (Heavy Ion Jet INteraction Generator) models shows that the long-range component of the FB correlation is captured by a few longitudinal harmonics, with the first component driven by the asymmetry in the number of participating nucleons in the two colliding nuclei. The higher-order longitudinal harmonics are found to be strongly damped in AMPT compared to HIJING, due to weaker short-range correlations as well as the final-state effects present in the AMPT model. Two-particle pseudorapidity correlation reveals interesting charge-dependent short-range structures that are absent in HIJING model. The proposed method opens an avenue to elucidate the particle production mechanism and early time dynamics in heavy-ion collisions. Future analysis directions and prospects of using the pseudorapidity correlation function to understand the centrality bias in p+p, p+A, and A+A collisions are discussed.

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  • Received 2 August 2015

DOI:https://doi.org/10.1103/PhysRevC.93.044905

©2016 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Jiangyong Jia1,2,*, Sooraj Radhakrishnan1, and Mingliang Zhou1,†

  • 1Department of Chemistry, Stony Brook University, Stony Brook, New York 11794, USA
  • 2Physics Department, Brookhaven National Laboratory, Upton, New York 11796, USA

  • *jjia@bnl.gov
  • mingliang.zhou@stonybrook.edu

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Issue

Vol. 93, Iss. 4 — April 2016

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