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

Jia, Jiangyong; Radhakrishnan, Sooraj; Zhou, Mingliang

doi:10.1103/PhysRevC.93.044905

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

Journal Article · Mon Apr 18 00:00:00 EDT 2016 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.93.044905· OSTI ID:1340375

Jia, Jiangyong ^[1]; Radhakrishnan, Sooraj ^[2]; Zhou, Mingliang ^[2]

Stony Brook Univ., NY (United States). Department of Chemistry; Brookhaven National Lab. (BNL), Upton, NY (United States). Physics Department
Stony Brook Univ., NY (United States). Department of Chemistry

In this paper, 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. Lastly, 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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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States). Relativistic Heavy Ion Collider (RHIC)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: SC00112704; SC0012704

OSTI ID:: 1340375

Alternate ID(s):: OSTI ID: 1247898

Report Number(s):: BNL-112526-2016-JA; R&D Project: PO 004; KB0202012

Journal Information:: Physical Review C, Vol. 93, Issue 4; ISSN 2469-9985

Publisher:: APSCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 23 works

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Centrality fluctuations in heavy-ion collisions Zhou, Mingliang; Jia, Jiangyong arXiv https://doi.org/10.48550/arxiv.1803.01812	text	January 2018

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