Beam-Energy Dependence of Charge Separation along the Magnetic Field in Au plus Au Collisions at RHIC

0433021 - ÚJF 2015 RIV US eng J - Journal Article
Adamczyk, L. - Adkins, J. K. - Agakishiev, G. - Aggarwal, M. M. - Ahammed, Z. - Alekseev, I. - Alford, J. - Anson, C. - Aparin, A. A. - Arkhipkin, D. - Aschenauer, E. - Bielčík, J. - Bielčíková, Jana - Pachr, M. - Rusňák, Jan - Rusňáková, O. - Šumbera, Michal - Tlustý, David - Trzeciak, B. A. - Vértési, Robert … Total 357 authors
Beam-Energy Dependence of Charge Separation along the Magnetic Field in Au plus Au Collisions at RHIC.
Physical Review Letters. Roč. 113, č. 5 (2014), 052302. ISSN 0031-9007. E-ISSN 1079-7114
R&D Projects: GA ČR GA13-20841S
Institutional support: RVO:61389005
Keywords : heavy ion collisions * STAR * hot QCD
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
Impact factor: 7.512, year: 2014

Local parity-odd domains are theorized to form inside a quark-gluon plasma 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. The experimental observation of charge separation has previously been reported for heavy-ion collisions at the top RHIC energies. In this Letter, 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. This implies the dominance of hadronic interactions over partonic ones at lower collision energies.
Permanent Link: http://hdl.handle.net/11104/0237300