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Transverse momentum and centrality dependence of dihadron correlations in Au+Au collisions at sNN=200 GeV: Jet quenching and the response of partonic matter

A. Adare et al. (PHENIX Collaboration)
Phys. Rev. C 77, 011901(R) – Published 7 January 2008

Abstract

Azimuthal angle (Δϕ) correlations are presented for charged hadrons from dijets for 0.4<pT<10 GeV/c in Au+Au collisions at sNN=200 GeV. With increasing pT, the away-side distribution evolves from a broad and relatively flat shape to a concave shape, then to a convex shape. Comparisons to p+p data suggest that the away-side can be divided into a partially suppressed “head” region centered at Δϕ~π and an enhanced “shoulder” region centered at Δϕ~π±1.1. The pT spectrum for the head region softens toward central collisions, consistent with the onset of jet quenching. The spectral slope for the shoulder region is independent of centrality and trigger pT, which offers constraints on energy transport mechanisms and suggests that it contains the medium response to energetic jets.

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  • Received 22 May 2007

DOI:https://doi.org/10.1103/PhysRevC.77.011901

©2008 American Physical Society

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Vol. 77, Iss. 1 — January 2008

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