Theoretical analysis of a possible observation of the chiral magnetic effect in Au + Au collisions within the RHIC beam energy scan program

Abstract

In terms of the hadron-string-dynamics (HSD) approach we investigate the correlation function in the azimuthal angle $\psi$ of charged hadrons that is expected to be sensitive to a signal of local strong parity violation. Our analysis of Au+Au collisions is based on the recent STAR data within the RHIC Beam-Energy-Scan (BES) program. The HSD model reasonably reproduces STAR data for $\sqrt{s_{NN}}=$7.7 GeV, while there are some deviations from the experiment at the collision energy of 11.5 GeV and an increase of deviations between theory and experiment at $\sqrt{s_{NN}}=$39 GeV. For reference, the results for $\sqrt{s_{NN}}=$ 200 GeV are given as well. The role of the retarded electromagnetic field is discussed and a compensation effect for the action of its electric and magnetic components is pointed out. We conclude that the recent RHIC BES data at $\sqrt{s_{NN}}=$7.7 and 11.5 GeV can be understood on the hadronic level without involving the idea of a strong parity violation; however, at $\sqrt{s_{NN}}\sim$40 GeV and above one needs to take into consideration explicit partonic (quark-qluon) degrees-of-freedom for a proper treatment of the dynamics.

6pages, 3 figures, 1 table; title changed by editor, references updated

References in corpus (13)

• The Chiral Magnetic Effect
• Electromagnetic field evolution in relativistic heavy-ion collisions
• Charge separation induced by P-odd bubbles in QCD matter
• Chiral Magnetic conductivity
• Parton transport and hadronization from the dynamical quasiparticle point of view
• Parton-Hadron-String Dynamics at Relativistic Collider Energies
• Charge conservation in RHIC and contributiuons to local parity violation observables
• Azimuthal correlations from transverse momentum conservation and possible local parity violation
• Effects of Momentum Conservation and Flow on Angular Correlations at RHIC
• Open and hidden charm in proton-nucleus and heavy-ion collisions
• Low mass dilepton production at ultrarelativistic energies
• Rise of azimuthal anisotropies as a signature of the Quark-Gluon-Plasma in relativistic heavy-ion collisions
• Beam-energy and system-size dependence of the CME

Cited by in corpus (21)

• The Chiral Magnetic Effect and Anomaly-Induced Transport
• Electromagnetic fields and anomalous transports in heavy-ion collisions --- A pedagogical review
• The ALICE experiment: a journey through QCD
• What can we learn from global spin alignment of $\varphi$ meson in heavy-ion collisions?
• Charge-Dependent Correlations in Relativistic Heavy Ion Collisions and the Chiral Magnetic Effect
• Dynamical evolution of the chiral magnetic effect: Applications to the quark-gluon plasma
• Examination of the directed flow puzzle in heavy-ion collisions
• Charge-dependent directed flow in asymmetric nuclear collisions
• Anomalous transport model study of chiral magnetic effects in heavy ion collisions
• Impact of the initial size of spatial fluctuations on the collective flow in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV
• Electromagnetic fields from the extended Kharzeev-McLerran-Warringa model in relativistic heavy-ion collisions
• Electromagnetic fields and directed flow in large and small colliding systems at ultrarelativistic energies
• Event-by-event background in estimates of the chiral magnetic effect
• Influence of electromagnetic fields in proton-nucleus collisions at relativistic energy
• Charge-dependent directed flows in heavy-ion collisions by Boltzmann-Maxwell equations
• p-Pb collisions at 5.02 TeV in the Parton-Hadron-String-Dynamics transport approach
• Observables in ultrarelativistic heavy-ion collisions from two different transport approaches for the same initial conditions
• Magnetic-Field Induced Critical Endpoint
• What are the early degrees of freedom in ultra-relativistic nucleus-nucleus collisions?
• Non-Abelian color fields from relativistic color charge configurations in the classical limit
• Effects of the magnetic field on the spallation reaction implemented by BUU coupled with a phase-space coalescence afterburner