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Beam-energy dependence of charge separation along the magnetic field in Au+Au collisions at RHIC
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Local parity-odd domains are theorized to form inside a Quark-Gluon-Plasma (QGP) which has been produced in high-energy heavy-ion collisions. The local parity-odd domains manifest themselves as charge separation along the magnetic field axis via the chiral magnetic effect (CME). The experimental observation of charge separation has previously been reported for heavy-ion collisions at the top RHIC energies. In this paper, we present the results of the beam-energy dependence of the charge correlations in Au+Au collisions at midrapidity for center-of-mass energies of 7.7, 11.5, 19.6, 27, 39 and 62.4 GeV from the STAR experiment. After background subtraction, the signal gradually reduces with decreased beam energy, and tends to vanish by 7.7 GeV. The implications of these results for the CME will be discussed.
Forward citations
Cited by 8 Pith papers
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Lattice QCD Study of Anomalous Transport Phenomena in Strongly Interacting Matter
First physical-point lattice QCD calculation of the Chiral Separation Effect conductivity, a zero equilibrium Chiral Magnetic Effect with conserved currents, and a localized equilibrium CME in inhomogeneous fields.
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A higher-harmonic observable for the chiral magnetic effect in heavy-ion collisions
The hexadecapole component of Δγ(φ_pair) is proposed as a CME-sensitive and background-insensitive observable based on magnetic field fluctuations in heavy-ion collision models.
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Spacetime profile of electromagnetic fields in intermediate-energy heavy-ion collisions
Intermediate-energy heavy-ion collisions produce event-averaged electromagnetic fields of order (50 MeV)^2 with a significant E·B component and a dominant electric-field spacetime volume.
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Influence of the neutron-skin effect on nuclear isobar collisions at RHIC
Including the neutron skin of zirconium in isobar collision simulations halves the predicted Ru/Zr magnetic-field strength difference from 10% to 5% in peripheral events.
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Magnetic fields in heavy ion collisions: flow and charge transport
Ideal MHD simulations of heavy-ion collisions find that a chiral magnetic field encoded in the initial conditions is transported by the expanding plasma into a late-time electric charge dipole perpendicular to the rea...
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Back-to-back relative-excess observable in search for the chiral magnetic effect
The back-to-back relative OS/SS pair excess r_BB(ϕ_BB) is sensitive to the chiral magnetic effect and far less affected by resonance-decay backgrounds than the standard Δγ observable.
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Constraining the chiral magnetic effect using spectator and participant planes across Au+Au and isobar collisions at $\sqrt{s_{_{\rm NN}}} = 200$ GeV
AMPT simulations suggest the CME signal-to-background plane ratio b/a is 0.88±0.08 in Au+Au, closer to unity than isobar collisions (0.65±0.18), implying the two-plane CME method is more reliable in Au+Au.
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Experimental Search for the Chiral Magnetic Effect in Relativistic Heavy-Ion Collisions: A Perspective
The chiral magnetic effect in heavy-ion collisions remains unconfirmed, with current data giving a 2.9-sigma hint in Au+Au and an upper limit near 10% in isobar collisions.
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