Charge-dependent directed flow in asymmetric nuclear collisions

2014/10/31 by V. Voronyuk, V. D. Toneev, В.Д. Тонеев +2 · 5 citations
Physics and Astronomy · #Atomic physics #Charged particle #Condensed matter physics #Electric charge #Electric field #Elliptic flow #Hadron #Heavy ion #High-Energy Particle Collisions Research #Ion #Momentum (technical analysis) #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Parton #Physics #Pseudorapidity #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Quark #Quark–gluon plasma #Quasiparticle #Relativistic Heavy Ion Collider #hep-ph #nucl-th

paper · pdf · doi:10.1103/physrevc.90.064903

published as Phys. Rev. C 90, 064903 (2014) · 8 pages, 12 figures

arxiv created 2014/11/19 · openalex publication_date 2014/12/08 · arxiv updated 2014/12/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

The directed flow of identified hadrons is studied within the parton-hadron-string-dynamics (PHSD) approach for the asymmetric system Cu + Au in noncentral collisions at √s_NN=200 GeV. It is emphasized that due to the difference in the number of protons of the colliding nuclei an electric field emerges, which is directed from the heavy to the light nucleus. This strong electric field is only present for about 0.25 fm/c at √s_NN=200 GeV and leads to a splitting of the directed flow v₁ for particles with the same mass but opposite electric charges in case of an early presence of charged quarks and antiquarks. The microscopic calculations of the directed flow for \ensuremathπ^\ifmmode±\else\textpm\fi,K^\ifmmode±\else\textpm\fi,p, and p are carried out in the PHSD by taking into account the electromagnetic field induced by the spectators as well as its influence on the hadronic and partonic quasiparticle trajectories. It is shown that the splitting of the directed flow as a function of pseudorapidity \ensuremathη and in particular as a function of the transverse momentum p_t provides a direct access to the electromagnetic response of the very early (nonequilibrium) phase of relativistic heavy-ion collisions and allows us to shed light on the presence (and number) of electric charges in this phase.

Citations

• Quantum dynamics and thermalization for out-of-equilibriumφ4theory
• QCD thermodynamics and confinement from a dynamical quasiparticle point of view
• New forms of QCD matter discovered at RHIC
• Collective flow signals the quark–gluon plasma

Cited by

• Examinations of the early degrees of freedom in ultrarelativistic nucleus-nucleus collisions
• Chiral magnetic and vortical effects in high-energy nuclear collisions—A status report
• The First Moment of Azimuthal Anisotropy in Nuclear Collisions from AGS to LHC Energies
• Charge-Dependent Directed Flow in Cu+Au Collisions at sNN=200 GeV
• Impact of the initial size of spatial fluctuations on the collective flow in Pb–Pb collisions at √s_\rm NN = 2.76 TeV

Related

• Spectator charge splitting of directed flow in heavy ion collisions
• Observation of the electromagnetic field effect via charge-dependent directed flow in heavy-ion collisions at the Relativistic Heavy Ion Collider
• Directed flow induced by electromagnetic fields in heavy ion collisions
• System size dependence of charged hadrons directed flow at √s_NN = 200 GeV using a multi-phase transport model
• Elliptic flow of charged hadrons in d+Au collisions at √s_NN = 200 GeV using a multi-phase transport model