Elliptic flow splitting between protons and antiprotons from hadronic potentials

2020/02/20 by Pengcheng Li, Yongjia Wang, Jan Steinheimer +2 · 6 citations
Physics and Astronomy · #Antiproton #Atomic and Molecular Physics #Baryon #Cascade #Elliptic flow #Flow (mathematics) #Hadron #High-Energy Particle Collisions Research #Large Hadron Collider #Proton #Quantum Chromodynamics and Particle Interactions #Rapidity #nucl-th

paper · pdf · doi:10.1142/s0217732320502892

published in Modern Physics Letters A 35(35), 2050289 (World Scientific) · 8 pages, 4 figures, submitted

arxiv created 2020/02/20 · openalex created_date 2020/03/06 · openalex publication_date 2020/09/22 · arxiv updated 2022/03/24 · openalex updated_date 2026/08/05

Abstract

The difference in elliptic flow v₂ between protons and antiprotons, produced in ¹⁹⁷Au+¹⁹⁷Au collisions at center-of-mass energies √s_NN=5-12~GeV, is studied within a modified version of the ultrarelativistic quantum molecular dynamics (UrQMD) model. Two different model scenarios are compared: the cascade mode and the mean field mode which includes potential interactions for both formed and pre-formed hadrons. The model results for the elliptic flow of protons and the relative v₂ difference between protons and antiprotons obtained from the mean field mode agree with the available experimental data, while the v₂ difference is near zero for the cascade mode. Our results show that the elliptic flow splitting, observed for particles and antiparticles, can be explained by the inclusion of proper hadronic interactions. In addition, the difference in v₂ between protons and antiprotons depends on the centrality and the rapidity window. With smaller centrality and/or rapidity acceptance, the observed elliptic flow splitting is more sensitive to the beam energy, indicating a strong net baryon density dependence of the effect. We propose to confirm this splitting at the upcoming experiments from Beam Energy Scan (BES) Phase-\Rmnum2 at Relativistic Heavy Ion Collider (RHIC), the Compressed Baryonic Matter (CBM) at Facility for Antiproton and Ion Research (FAIR), High Intensity heavy ion Accelerator Facility (HIAF) and Nuclotron-based Ion Collider fAcility (NICA).

Citations

• Transport model study of the mT-scaling for Λ, K, and π HBT-correlations
• Energy dependence of Λ and Ξ production in centralPb+Pbcollisions at20A,30A,40A,80A, and 158AGeV measured at the CERN Super Proton Synchrotron
• Relativistic Hadron-Hadron Collisions in the Ultra-Relativistic Quantum Molecular Dynamics Model (UrQMD)
• A model comparison of resonance lifetime modifications, a soft equation of state and non-Gaussian effects on π–π correlations at FAIR/AGS energies
• Suppression of high transverse momentum hadrons at RHIC by (pre-) hadronic final state interactions
• Elliptic Flow: Transition from Out-of-Plane to In-Plane Emission inAu<mml:mspace/>+<mml:mspace/>AuCollisions
• The phase diagram of nuclear and quark matter at high baryon density
• Multiphase transport model for relativistic heavy ion collisions
• Elliptic flow: a brief review
• Microscopic models for ultrarelativistic heavy ion collisions
• Beam-Energy Dependence of Directed Flow ofΛ,Λ¯,K±,Ks0, andϕinAu+AuCollisions