System size and energy dependence of near-side dihadron correlations

G. Agakishiev et al. (STAR Collaboration)
Phys. Rev. C 85, 014903 – Published 6 January 2012

Abstract

Two-particle azimuthal (Δφ) and pseudorapidity (Δη) correlations using a trigger particle with large transverse momentum (pT) in d+Au, Cu+Cu, and Au+Au collisions at sNN = 62.4 GeV and 200 GeV from the STAR experiment at the Relativistic Heavy Ion Collider are presented. The near-side correlation is separated into a jet-like component, narrow in both Δφ and Δη, and the ridge, narrow in Δφ but broad in Δη. 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 pT. 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 sNN = 200 GeV, is also found in Cu+Cu collisions and in collisions at sNN = 62.4 GeV, but is found to be substantially smaller at sNN = 62.4 GeV than at sNN = 200 GeV for the same average number of participants (Npart). Measurements of the ridge are compared to models.

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  • Received 26 October 2011

DOI:https://doi.org/10.1103/PhysRevC.85.014903

©2012 American Physical Society

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Vol. 85, Iss. 1 — January 2012

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