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

Adamczyk, L. and Planinić, Mirko and Poljak, Nikola and Zyzak, M. (STAR Collaboration) (2014) Beam-Energy Dependence of Charge Separation along the Magnetic Field in Au+Au Collisions at RHIC. Physical Review Letters, 113 (5). pp. 52302-7. ISSN 0031-9007

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Abstract

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.

Item Type: Article
Date: July 2014
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2014) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: mag. bibl. Marija Turković
Date Deposited: 15 Sep 2014 11:52
Last Modified: 17 Sep 2014 12:56
URI: http://digre.pmf.unizg.hr/id/eprint/2767

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