2009/09/01 by The STAR Collaboration, M. M. Aggarwal, B. I. Abelev +97 · 2 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #nucl-ex
paper · pdf · doi:10.1103/physrevc.80.064912
published as Phys.Rev.C80:064912,2009 · Submitted to Phys. Rev. C, 9 pages, 6 figures
arxiv created 2009/09/01 · openalex publication_date 2009/12/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/01
The STAR Collaboration at the Relativistic Heavy Ion Collider presents a systematic study of high-transverse-momentum charged-di-hadron correlations at small azimuthal pair separation \ensuremathΔ\ensuremathφ in d+Au and central Au+Au collisions at √sNN=200 GeV. Significant correlated yield for pairs with large longitudinal separation \ensuremathΔ\ensuremathη is observed in central Au+Au collisions, in contrast to d+Au collisions. The associated yield distribution in \ensuremathΔ\ensuremathη\ifmmode×\else\texttimes\fi\ensuremathΔ\ensuremathφ can be decomposed into a narrow jet-like peak at small angular separation which has a similar shape to that found in d+Au collisions, and a component that is narrow in \ensuremathΔ\ensuremathφ and depends only weakly on \ensuremathΔ\ensuremathη, the ``ridge.'' Using two systematically independent determinations of the background normalization and shape, finite ridge yield is found to persist for trigger pt>6 GeV/c, indicating that it is correlated with jet production. The transverse-momentum spectrum of hadrons comprising the ridge is found to be similar to that of bulk particle production in the measured range (2<pt<4 GeV/c).