Rapidity bin multiplicity correlations from a multi-phase transport model
Abstract.The central-arbitrary bin and forward-backward bin multiplicity correlation patterns for Au+Au collisions at $ \sqrt{s_{NN}} = 7.7-62.4$ GeV are investigated within a multi-phase transport (AMPT) model. An interesting observation is that for $ \sqrt{s_{NN}} < 19.6$ GeV Au+Au collisions, these two correlation patterns both have an increase with the pseudorapidity gap, while for $ \sqrt{s_{NN}} > 19.6$ GeV Au+Au collisions, they decrease. We mainly discuss the influence of different evolution stages of collision system on the central-arbitrary bin correlations, such as the initial conditions, partonic scatterings, hadronization scheme and hadronic scatterings. Our results show that the central-arbitrary bin multiplicity correlations have different responses to partonic phase and hadronic phase, which can be suggested as a good probe to explore the dynamical evolution mechanism of the hot dense matter in high-energy heavy-ion collisions.