Campus Units

Physics and Astronomy

Document Type

Article

Publication Version

Published Version

Publication Date

9-28-2015

Journal or Book Title

Physical Review Letters

Volume

115

Issue

14

First Page

142301

DOI

10.1103/PhysRevLett.115.142301

Abstract

We present the first measurement of elliptic (v(2)) and triangular (v(3)) flow in high-multiplicity He-3 + Au collisions at root s(NN) = 200 GeV. Two-particle correlations, where the particles have a large separation in pseudorapidity, are compared in He-3 + Au and in p + p collisions and indicate that collective effects dominate the second and third Fourier components for the correlations observed in the He-3 + Au system. The collective behavior is quantified in terms of elliptic v(2) and triangular v(3) anisotropy coefficients measured with respect to their corresponding event planes. The v(2) values are comparable to those previously measured in d + Au collisions at the same nucleon-nucleon center-of-mass energy. Comparisons with various theoretical predictions are made, including to models where the hot spots created by the impact of the three He-3 nucleons on the Au nucleus expand hydrodynamically to generate the triangular flow. The agreement of these models with data may indicate the formation of low-viscosity quark-gluon plasma even in these small collision systems.

Comments

This is an article from Physical Review Letters 115 (2015): 142301, doi:10.1103/PhysRevLett.115.142301. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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