Effects of initial-state dynamics on collective flow within a coupled transport and viscous hydrodynamic approach

Chandrodoy Chattopadhyay (1) , Rajeev S. Bhalerao (1) , Jean-Yves Ollitrault (2) , Subrata Pal (3)

1 TIFR - Tata Institute for Fundamental Research
2 IPHT - Institut de Physique Théorique - UMR CNRS 3681
3 Department of Nuclear and Atomic Physics

We evaluate the effects of preequilibrium dynamics on observables in ultrarelativistic heavy-ion collisions. We simulate the initial nonequilibrium phase within A MultiPhase Transport (AMPT) model, while the subsequent near-equilibrium evolution is modeled using (2+1)-dimensional relativistic viscous hydrodynamics. We match the two stages of evolution carefully by calculating the full energy-momentum tensor from AMPT and using it as input for the hydrodynamic evolution. With a shear viscosity to entropy density ratio of $0.12$, our model describes quantitatively a large set of experimental data on Pb+Pb collisions at the Large Hadron Collider(LHC) over a wide range of centrality: differential anisotropic flow $v_n(p_T) ~(n=2-6)$, event-plane correlations, correlation between $v_2$ and $v_3$, and cumulant ratio $v_2\{4\}/v_2\{2\}$.

Domaines: Physique Nucléaire Théorique [nucl-th]; Physique Nucléaire Expérimentale [nucl-ex]

Chandrodoy Chattopadhyay, Rajeev S. Bhalerao, Jean-Yves Ollitrault, Subrata Pal. Effects of initial-state dynamics on collective flow within a coupled transport and viscous hydrodynamic approach. Physical Review C, 2018, 97, pp.034915. ⟨cea-01613944⟩