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Advances in High Energy Physics
Volume 2016, Article ID 2836989, 16 pages
Review Article

The First Moment of Azimuthal Anisotropy in Nuclear Collisions from AGS to LHC Energies

Department of Physics, Kent State University, Ohio 44242, USA

Received 22 June 2016; Accepted 29 September 2016

Academic Editor: Emil Bjerrum-Bohr

Copyright © 2016 Subhash Singha et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The publication of this article was funded by SCOAP3.


We review topics related to the first moment of azimuthal anisotropy (), commonly known as directed flow, focusing on both charged particles and identified particles from heavy-ion collisions. Beam energies from the highest available, at the CERN LHC, down to projectile kinetic energies per nucleon of a few GeV per nucleon, as studied in experiments at the Brookhaven AGS, fall within our scope. We focus on experimental measurements and on theoretical work where direct comparisons with experiment have been emphasized. The physics addressed or potentially addressed by this review topic includes the study of Quark Gluon Plasma and, more generally, investigation of the Quantum Chromodynamics phase diagram and the equation of state describing the accessible phases.