Balance functions from Au+Au, d+Au, and p+p collisions at root s(NN)=200 GeV

0356916 - ÚJF 2011 RIV US eng J - Journal Article
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Balance functions from Au+Au, d+Au, and p+p collisions at root s(NN)=200 GeV.
Physical Review. C. Roč. 82, č. 2 (2010), 024905/1-024905/16. ISSN 0556-2813
Institutional research plan: CEZ:AV0Z10480505; CEZ:AV0Z10100502
Keywords : HEAVY-ION COLLISIONS * AU-AU COLLISIONS * TIME PROJECTION CHAMBER
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
Impact factor: 3.416, year: 2010

Balance functions have been measured for charged-particle pairs, identified charged-pion pairs, and identified charged-kaon pairs in Au + Au, d + Au, and p + p collisions at root s(NN) = 200 GeV at the Relativistic Heavy Ion Collider using the STAR detector. These balance functions are presented in terms of relative pseudorapidity, Delta eta, relative rapidity, Delta y, relative azimuthal angle, Delta phi, and invariant relative momentum, q(inv). For charged-particle pairs, the width of the balance function in terms of Delta eta scales smoothly with the number of participating nucleons, while HIJING and UrQMD model calculations show no dependence on centrality or system size. For charged-particle and charged-pion pairs, the balance functions widths in terms of Delta eta and Delta y are narrower in central Au + Au collisions than in peripheral collisions.
Permanent Link: http://hdl.handle.net/11104/0195312