Campus Units

Physics and Astronomy

Document Type

Article

Publication Version

Published Version

Publication Date

11-20-2013

Journal or Book Title

Physical Review Letters

Volume

111

Issue

21

First Page

212301

DOI

10.1103/PhysRevLett.111.212301

Abstract

The PHENIX collaboration at the Relativistic Heavy Ion Collider (RHIC) reports measurements of azimuthal dihadron correlations near midrapidity in d + Au collisions at root s(NN) = 200 GeV. These measurements complement recent analyses by experiments at the Large Hadron Collider (LHC) involving central p + Pb collisions at root s(NN) = 5.02 TeV, which have indicated strong anisotropic long-range correlations in angular distributions of hadron pairs. The origin of these anisotropies is currently unknown. Various competing explanations include parton saturation and hydrodynamic flow. We observe qualitatively similar, but larger, anisotropies in d + Au collisions at RHIC compared to those seen in p + Pb collisions at the LHC. The larger extracted upsilon(2) values in d + Au are consistent with expectations from hydrodynamic calculations owing to the larger expected initial-state eccentricity compared with that from p + Pb collisions. When both are divided by an estimate of the initial-state eccentricity the scaled anisotropies follow a common trend with multiplicity that may extend to heavy ion data at RHIC and the LHC, where the anisotropies are widely thought to arise from hydrodynamic flow.

Comments

This is an article from Physical Review Letters 111 (2013): 212301-1, doi:10.1103/PhysRevLett.111.212301. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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