Long range rapidity correlations and jet production in high energy nuclear collisions

B. I. Abelev et al. (STAR Collaboration)
Phys. Rev. C 80, 064912 – Published 29 December 2009

Abstract

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 Δϕ in d+Au and central Au+Au collisions at sNN=200 GeV. Significant correlated yield for pairs with large longitudinal separation Δη is observed in central Au+Au collisions, in contrast to d+Au collisions. The associated yield distribution in Δη×Δϕ 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 Δϕ and depends only weakly on Δη, 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<4GeV/c).

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  • Received 1 September 2009

DOI:https://doi.org/10.1103/PhysRevC.80.064912

©2009 American Physical Society

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Vol. 80, Iss. 6 — December 2009

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