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

0464225 - ÚJF 2017 RIV US eng J - Journal Article
Adamczyk, L. - Adkins, J. K. - Agakishiev, G. - Bielčík, J. - Bielčíková, Jana - Chaloupka, P. - Federič, Pavol - Rusňák, Jan - Rusňáková, O. - Šimko, Miroslav - Šumbera, Michal - Tlustý, David - Trzeciak, B. A. - Vértési, Robert … Total 332 authors
Beam-energy dependence of charge balance functions from Au plus Au collisions at energies available at the BNL Relativistic Heavy Ion Collider.
Physical Review C. Roč. 94, č. 2 (2016), s. 024909. ISSN 2469-9985. E-ISSN 2469-9993
R&D Projects: GA MŠMT LG15001; GA ČR GA13-20841S
Institutional support: RVO:61389005
Keywords : STAR experiment * BNL * LHC
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
Impact factor: 3.820, year: 2016

Balance functions have been measured in terms of relative pseudorapidity (Delta(eta)) for charged particle pairs at the BNL Relativistic Heavy Ion Collider from Au + Au collisions at root s(NN) = 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 root s(NN) = 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 root s(NN) = 7.7 GeV implies that a QGP is still being created at this relatively low energy.
Permanent Link: http://hdl.handle.net/11104/0263203