Document Type

Article

Publication Date

2012

DOI

10.1103/PhysRevC.85.014903

Publication Title

Physical Review C

Volume

85

Issue

1

Pages

014903 (16 pages)

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.

Comments

Article is open access under the terms of the Creative Commons Attribution license.

Original Publication Citation

Agakishiev, G., Aggarwal, M. M., Ahammed, Z., Alakhverdyants, A. V., Alekseev, I., Alford, J., . . . Collaboration, S. (2012). System size and energy dependence of near-side dihadron correlations. Physical Review C, 85(1), 014903. doi:10.1103/PhysRevC.85.014903

ORCID

0000-0002-5680-1814 (Bueltmann)

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