Beam-energy dependence of charge balance functions from Au + Au collisions at energies available at the BNL Relativistic Heavy Ion Collider

Adamczyk, L. and Planinić, Mirko and Poljak, Nikola and Zyzak, M. (STAR Collaboration) (2016) Beam-energy dependence of charge balance functions from Au + Au collisions at energies available at the BNL Relativistic Heavy Ion Collider. Physical Review C, 94 (2). pp. 24909-7. ISSN 2469-9985

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Abstract

Balance functions have been measured in terms of relative pseudorapidity (η) for charged particle pairs at the BNL Relativistic Heavy Ion Collider from Au + Au collisions at √sNN = 7.7 GeV to 200 GeV using the STAR detector. These results are compared with balance functions measured at the CERN Large Hadron Collider from Pb + Pb collisions at √sNN = 2.76 TeV by the ALICE Collaboration. The width of the balance function decreases as the collisions become more central and as the beam energy is increased. In contrast, the widths of the balance functions calculated using shuffled events show little dependence on centrality or beam energy and are larger than the observed widths. Balance function widths calculated using events generated by UrQMD are wider than the measured widths in central collisions and show little centrality dependence. The measured widths of the balance functions in central collisions are consistent with the delayed hadronization of a deconfined quark gluon plasma (QGP). The narrowing of the balance function in central collisions at √sNN = 7.7 GeV implies that a QGP is still being created at this relatively low energy.

Item Type: Article
Date: 16 August 2016
Subjects: NATURAL SCIENCES > Physics
Additional Information: © 2016 American Physical Society. Received 13 July 2015. Revised manuscript received 30 June 2016. Published 16 August 2016.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 16 Sep 2017 18:23
Last Modified: 16 Sep 2017 18:23
URI: http://digre.pmf.unizg.hr/id/eprint/5563

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