Anti-flow of Mesons in the High Baryon Density Region

Abstract

The E895 and STAR experiments demonstrate that the slopes of directed flow with respect to rapidity ($d{v}_1/dy{|}_{y=0}$) of mesons are negative in the low transverse momentum ($p_T$) region, $p_T<0.8$ GeV/$c$, in Au + Au collisions at $\sqrt{s_{NN}}=3.0-3.9$ GeV. Using the transport model JAM, we investigate the directed flow of ${\pi }^{\pm }$, $K^{\pm }$, and $K^0$ as functions of rapidity, $p_T$, and collision energy in Au + Au collisions at the same energies as those in the E895 and STAR experiments. We find that the JAM model can qualitatively reproduce the anti-flow of $K_S^0$ observed in the E895 experiment. The $v_1$ slopes of pions and kaons are analyzed as functions of the $p_T$ window, revealing a strong $p_T$ dependence of the $v_1$ slopes. Negative $v_1$ slopes are observed in the low $p_T$ region, $p_T<0.8$ GeV/$c$, while positive slopes are shown in the higher $p_T$ region. We find that the shadowing effect from spectators is crucial in generating the anti-flow of mesons at low $p_T$ in the high baryon density region.

7 pages, 7 figures, accepted by Phys. Rev. C

References in corpus (19)

• Elliptic and triangular flow in event-by-event (3+1)D viscous hydrodynamics
• Directed flow in ultrarelativistic heavy-ion collisions
• Directed Flow Indicates a Crossover Deconfinement Transition in Relativistic Nuclear Collisions
• Mean-field update in the JAM microscopic model: Mean-field effects on collective flow in high-energy heavy-ion collisions at $\sqrt{s_{NN}}=2-20$ GeV energies
• Sensitivity of Au+Au collisions to the symmetric nuclear matter equation of state at 2 -- 5 nuclear saturation densities
• QCD Equation of State of Dense Nuclear Matter from a Bayesian Analysis of Heavy-Ion Collision Data
• The high-density equation of state in heavy-ion collisions: Constraints from proton flow
• Probing initial baryon stopping and equation of state with rapidity-dependent directed flow of identified particles
• Directed flow of $\Lambda$ in high-energy heavy-ion collisions and $\Lambda$ potential in dense nuclear matter
• Longitudinal distribution of initial energy density and directed flow of charged particles in relativistic heavy-ion collisions
• Splitting of proton-antiproton directed flow in relativistic heavy-ion collisions
• Testing the phase transition parameters inside neutron stars with the production of protons and lambdas in relativistic heavy-ion collisions
• Helicity and vorticity in heavy-ion collisions at NICA energies
• Hyperon polarization and its relation with directed flow in high-energy nuclear collisions
• Directed flow and global polarization in Au+Au collisions across energies covered by the beam energy scan at RHIC
• Phase diagram determination at fivefold nuclear compression
• Probing the incompressibility of dense hadronic matter near QCD phase transition in relativistic heavy-ion collisions
• Examination of STAR fixed-target data on directed flow at $\sqrt{s_{NN}}=$ 3 and 4.5 GeV
• Anisotropic Flow of Identified Particles in Au + Au Collisions at $\sqrt{s_{NN}}$ = 3-3.9 GeV at RHIC

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• Transport-model investigation of scaling of the number of constituent quarks and the hadronic-partonic transition in Au + Au collisions
• Measurement of Kaon Directed Flow in Au+Au Collisions in the High Baryon Density Region