System size and energy dependence of near-side di-hadron correlations
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Abstract: (arXiv)
Two-particle azimuthal () and pseudorapidity () correlations using a trigger particle with large transverse momentum () in +Au, Cu+Cu and Au+Au collisions at =\xspace 62.4 GeV and 200~GeV from the STAR experiment at RHIC are presented. The \ns correlation is separated into a jet-like component, narrow in both and , and the ridge, narrow in but broad in . Both components are studied as a function of collision centrality, and the jet-like correlation is studied as a function of the trigger and associated . The behavior of the jet-like component is remarkably consistent for different collision systems, suggesting it is produced by fragmentation. The width of the jet-like correlation is found to increase with the system size. The ridge, previously observed in Au+Au collisions at = 200 GeV, is also found in Cu+Cu collisions and in collisions at =\xspace 62.4 GeV, but is found to be substantially smaller at =\xspace 62.4 GeV than at = 200 GeV for the same average number of participants (). Measurements of the ridge are compared to models.Note:
- 17 pages, 14 figures, submitted to Phys. Rev. C
- 24.85.+p
- 21.65.Qr
- 25.75.Bh
- 25.75.Gz
- hadron hadron: correlation
- angular correlation
- transverse momentum: high
- heavy ion: scattering
- deuteron
- gold
References(64)
Figures(15)