Beam energy dependence of transverse momentum distribution and elliptic flow in Au-Au collisions using HYDJET++ model

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In this work, we present the transverse momentum spectra and elliptic flow (v₂) of π^±,k^±, p and p̄ in Au-Au collisions at √sNN= 62.4, 39.0, 27.0, 19.6 and 11.5 GeV using HYDJET++ model. For each beam energy the transverse momentum spectra are shown in four centrality classes at mid rapidity |y|≤ 0.1 and for elliptic flow (v₂) we have shown results for minimum bias events. We have performed a qualitative comparison between the hard and soft processes at different beam energies. The HYDJET++ model calculations for particle ratios, pT spectra, and v₂ agree well with the available experimental data. The HYDJET++ parameters like baryonic and strangeness chemical potential, and chemical and thermal freeze-out temperature vary with collision energy. Azimuthal spatial anisotropy (ε) and azimuthal momentum anisotropy (δ) decrease with collision energy which leads to a smaller value of v₂ at lower collision energies. Furthermore, the hadrons containing strange quarks tend to have smaller values of spatial and momentum anisotropy than the non-strange hadrons.