Interplay between soft and hard hadronic components for identified hadrons in relativistic heavy ion collisions

Abstract

We investigate the transverse dynamics in $\text{Au}+\text{Au}$ collisions at $\sqrt{{s}_{NN}}=200\phantom{\rule{0.3em}{0ex}}\text{GeV}$ by emphasis upon the interplay between soft and hard components through ${p}_{T}$ dependences of particle spectra, ratios of yields, suppression factors, and elliptic flow for identified hadrons. From hydrodynamics combined with traversing minijets which go through jet quenching in the hot medium, we calculate interactions of hard jets with the soft hydrodynamic components. It is shown by the explicit dynamical calculations that the hydrodynamic radial flow and the jet quenching of hard jets are the keys to understand the differences among the hadron spectra for pions, kaons, and protons. This leads to the natural interpretation for ${N}_{p}∕{N}_{\ensuremath{\pi}}\ensuremath{\sim}1$, ${R}_{AA}\ensuremath{\gtrsim}1$ for protons, and ${v}_{2}^{p}>{v}_{2}^{\ensuremath{\pi}}$ recently observed in the intermediate transverse momentum region at Relativistic Heavy Ion Collider.