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

0433021 - ÚJF 2015 RIV US eng J - Článek v odborném periodiku
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 … celkem 357 autorů
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
Grant CEP: GA ČR GA13-20841S
Institucionální podpora: RVO:61389005
Klíčová slova: heavy ion collisions * STAR * hot QCD
Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače
Impakt faktor: 7.512, rok: 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.
Trvalý link: http://hdl.handle.net/11104/0237300