Abstract
We study the production of pions, kaons, and (anti)protons in A Multi Phase Transport (AMPT) Model in Au+Au collisions at $\sqrt{s_{NN}}=$ 7.7, 27, and 200 GeV. We present the centrality and energy dependence of various bulk observables such as invariant yields as a function of transverse momentum $p_T$, particle yields $dN/dy$, average transverse momentum $\langle p_T \rangle$, and various particle ratios, and compare them with experimental data. Both default and string melting (SM) versions of the AMPT model are used with three different sets of initial conditions. We observe that neither the default nor the SM version of the model could consistently describe the centrality dependence of all observables at the above energies with any one set of initial conditions. The energy dependence behavior of the experimental observables for 0--5\% central collisions is in general better described by the default AMPT model using the modified HIJING parameters for Lund string fragmentation and 3mb parton scattering cross-section. In addition, the kaon production as well as the $K/\pi$ ratio at 7.7 GeV are under predicted by the AMPT model.
Highlights
Relativistic collisions of heavy ions make it possible to subject nuclear matter to the extreme energy densities required for a possible deconfinement of quarks and gluons
At 27 GeV, the ratio is well explained by set C parameters for all Npart
At 27 GeV, the ratio is described by set A parameters at all Npart
Summary
Relativistic collisions of heavy ions make it possible to subject nuclear matter to the extreme energy densities required for a possible deconfinement of quarks and gluons. Exploring the quantum chromodynamics (QCD) phase diagram to understand the properties of quark matter is one of the most important goals of high-energy heavy-ion experiments [5,6,7]. Assuming a thermalized system is reached in heavy-ion collisions, both T and μB can be varied by changing the collision energy [8,9,10] To this end, the Beam Energy Scan (BES) program at the BNL Relativistic Heavy Ion Collider (RHIC) completed its first phase of operation in 2010 and 2011 [11,12,13,14,15,16,17,18].
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