Charge Separation Measurements in Au+Au collisions at √s_NN= 7.7--200 GeV in Search of the Chiral Magnetic Effect

2025/05/30 by the STAR Collaboration, The STAR Collaboration · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Quantum Chromodynamics and Particle Interactions #Nuclear physics research studies

paper · pdf · doi:10.48550/arxiv.2506.00275

Abstract

The chiral magnetic effect in heavy-ion collisions predicts a charge separation signal along a magnetic field, which indicates local P and CP violations in the quark-gluon plasma. We report measurements of electric charge separation signals perpendicular to the spectator event plane in Au+Au collisions using high-statistics data from RHIC Beam Energy Scan II and top-energy runs. A novel event shape selection method is employed to suppress the flow-induced background. The residual charge separation signals near the zero-flow limit are positive in Au+Au collisions within the 20%--50% centrality range, with significance levels of 2.6σ, 3.1σ, and 3.3σ at √s_NN = 11.5, 14.6, and 19.6 GeV, respectively. At other beam energies, the signals are either statistically limited or consistent with zero.

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