Abstract
The initial geometry effect on forward-backward multiplicity correlations $C(N_{f},N_{b})$ is studied in relativistic collisions between light nuclei by using a multiphase transport model (AMPT). It is found that tetrahedron $^{16}$O + $^{16}$O gives a more uniform and symmetrical fireball which produces a more isotropic distribution of final particles after the expansion and evolution, and leads to a small $C(N_{f},N_{b})$. Forward-backward multiplicity correlation could be taken as a useful probe to distinguish the pattern of $\alpha$-clustered $^{16}$O in experiments by comparing the neighboring colliding nuclear systems like $^{14}$N + $^{14}$N and $^{19}$F + $^{19}$F.
Highlights
Relativistic heavy ion collisions produce an extreme hot and dense environment and provide a venue to understand the properties of early-stage quark matter in the Universe as well as the strong interaction [1,2,3,4,5,6]
Due to the strong initial-state density fluctuations in the light nucleus, the space-time evolution of the produced matter in the final state fluctuates event to event. These density fluctuations generate long-range correlations (LRC) at the early stages of the collision, well before the onset of any collective behavior, and appear as correlations of the multiplicity densities of produced particles separated in pseudorapidity (η) [33,34,35,36]
A systematic study on forward-backward multiplicity correlations C(Nf, Nb) from large systems to small ones has been performed through the AMPT model
Summary
Relativistic heavy ion collisions produce an extreme hot and dense environment and provide a venue to understand the properties of early-stage quark matter in the Universe as well as the strong interaction [1,2,3,4,5,6]. Due to the strong initial-state density fluctuations in the light nucleus, the space-time evolution of the produced matter in the final state fluctuates event to event These density fluctuations generate long-range correlations (LRC) at the early stages of the collision, well before the onset of any collective behavior, and appear as correlations of the multiplicity densities of produced particles separated in pseudorapidity (η) [33,34,35,36]. The forward-backward (FB) correlation between final-state charged particle multiplicities in two separated η windows is a useful observable in high-energy hadron or nuclear collisions to study the dynamics of particle production mechanism [37,38,39,40] and may provide the information of collided nuclei if it is built up with exotic nuclear structure, such as α cluster.
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