Abstract
Long-range correlations are searched for by analysing the experimental data on16O-AgBr and32S-AgBr collisions at 200 A GeV/c and the results are compared with the predictions of a multi phase transport (AMPT) model. The findings reveal that the observed forward-backward (F-B) multiplicity correlations are mainly of short range in nature. The range of F-B correlations are observed to extend with increasing projectile mass. The observed extended range of F-B correlations might be due to overall multiplicity fluctuations arising because of nuclear geometry. The findings are not sufficient for making any definite conclusions regarding the presence of long-range correlations.
Highlights
One of the main goals of studying nucleus-nucleus collisions at relativistic energies is to study the properties of strongly interacting matter under extreme conditions of initial energy density and temperature, where formation of quark-gluon plasma (QGP) is envisaged to take place [1,2,3]
The short-range correlations (SRC) have been observed to remain confined to a region, η ∼ ±1 unit around mid rapidity, while the long-range correlations (LRC), which arise due to ebe fluctuations of overall particle multiplicity, extend to a rather longer range [14,15,16] (>2 units of η)
For AA collisions, the multiparton interactions are expected to give rise to LRC, which would extend to rather longer range as compared to those observed in hh collision at the same incident energy [6, 15, 20, 21]
Summary
One of the main goals of studying nucleus-nucleus collisions at relativistic energies is to study the properties of strongly interacting matter under extreme conditions of initial energy density and temperature, where formation of quark-gluon plasma (QGP) is envisaged to take place [1,2,3]. Correlations among the relativistic charged particles produced in different pseudorapidity, η bins, are considered as a powerful tool for understanding the underlying mechanism of multiparticle production in hadron-hadron (hh), hadron-nucleus (hA), and nucleus-nucleus (A-A) collisions [4,5,6] Both short- and long-range correlations have been observed in hadronic and heavy-ion collisions at SPS and RHIC energies [5,6,7,8,9,10]. Once such dependence is understood, modification in the cluster characteristics or shortening of correlation length may be looked into to search for QGP formation
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