Forward-backward multiplicity correlations in relativistic heavy-ion collisions in a superposition approach

Abstract

We analyze the multiplicity correlations between distant forward and backward rapidity regions in relativistic heavy-ion collisions in a superposition framework, where the particle production occurs through independent emission from correlated sources. This in principle allows for inferring information on the long-range forward-backward correlations of the sources in the earliest phase of the collision, based solely on the experimental information on the statistical features of the observed particle distributions. Our three-stage study incorporates the fluctuations of parton production in the early phase, the effect of intermediate hydrodynamic evolution, as well as fluctuations in the production of particles at freeze-out. We investigate the dependence of the results on the features of the overlaid distributions and hydrodynamics, as well as the centrality dependence. We analyze the existing data from the STAR Collaboration. Predictions for the forward-backward multiplicity correlations in Pb+Pb collisions to be analyzed at the LHC are also made.

8 pages, 3 figures, improved analysis of the STAR data

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Cited by in corpus (10)

• Forward-backward correlations between multiplicities in windows separated in azimuth and rapidity
• Hydrodynamic modeling of pseudorapidity flow correlations in relativistic heavy-ion collisions and the torque effect
• A simple model for rapidity fluctuations in the initial state of ultra-relativistic heavy-ion collisions
• Two-particle correlations in pseudorapidity in a hydrodynamic model
• Partial correlation analysis method in ultra-relativistic heavy-ion collisions
• Statistical moments in superposition models and strongly intensive measures
• Multibin correlations in a superposition approach to relativistic heavy-ion collisions
• Forward-backward multiplicity correlations at the LHC from independent sources
• Multiplicity fluctuations and rapidity correlations in ultracentral proton-nucleus collisions
• Partial correlation analysis in ultra-relativistic nuclear collisions