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Jun 24 – 28, 2019
US/Eastern timezone
5th International Conference on the Initial Stages in High-Energy Nuclear Collisions

Forward-backward centrality fluctuation in heavy ion collisions

Jun 25, 2019, 4:19 PM
8th floor Theory Center (Pupin)

8th floor Theory Center


Poster Initial conditions for hydrodynamics & transport coefficients Posters


Jia Jiangyong (stony brook university & BNL)


Centrality fluctuations is one of the main uncertainties for interpreting the centrality dependence of many experimental observables. The centrality fluctuation is constrained by selection based on particle multiplicity in a reference subevent, and contributes to observables measured in another subevent. Due to the asymmetry between forward- and backward-going participating nucleons, the number of sources for particle production is a function of $\eta$ even in a single event, which leads to centrality decorrelation between different rapidities. Using a Glauber-based independent source model, we study the influence of centrality decorrelations on multi-particle cumulants. In mid-central collisions, a general relation is established between the multiplicity fluctuation and resulting centrality resolution in given subevent. In ultra-central collisions, where distribution of particle production sources is strongly distorted, we find these cumulants exhibit different behavior, due to observable-dependent non-Gaussianity in the underlying distributions. Furthermore, we investigate the influence centrality fluctuations in HIJING and UrQMD models. This study can be considered as a first step towards detailed understanding of the longitudinal dynamics for particle production in heavy-ion collisions.

Primary author

Jia Jiangyong (stony brook university & BNL)


Mr Chunjian Zhang (Stony Brook University, Shanghai Institute of Applied Physics)

Presentation materials