Abstract
The transverse-momentum-integrated elliptic flow of charged particles at midrapidity, (charged), and that of identified hadrons from collisions are computed in a wide range of incident energies GeV. The simulations are performed within a three-fluid model by employing three different equations of state (EoSs): a purely hadronic EoS and two versions of the EoS involving the deconfinement transition—a first-order phase transition and a smooth crossover one. The present simulations demonstrate low sensitivity of (charged) to the EoS. All considered scenarios equally well reproduce recent STAR data on (charged) for mid-central collisions and properly describe its change of sign at the incident energy decrease below GeV. The predicted integrated elliptic flow of various species exhibits a stronger dependence on the EoS. A noticeable sensitivity to the EoS is found for antibaryons and, to a lesser extent, for mesons. In particular, the excitation functions of antibaryons exhibit a nonmonotonicity within the deconfinement scenarios that was predicted by Kolb, Sollfrank, and Heinz. However, low multiplicities of antibaryons at GeV result in large fluctuations of their , which may wash out this nonmonotonicity.
- Received 17 September 2014
- Revised 12 January 2015
DOI:https://doi.org/10.1103/PhysRevC.91.024914
©2015 American Physical Society