Directed flow at midrapidity in heavy-ion collisions

Details Directed flow at midrapidity in heavy-ion collisions Directed flow at midrapidity in heavy-ion collisions

2010-11-29

arxiv.org/abs/1011.6361v3

Phys.Rev.Lett.106:102301,2011

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 1 figure; v3: fixed factors of 2 in Eqs. 3,4; v2: a number of minor improvements, version accepted for publication in

Scientific paper

10.1103/PhysRevLett.106.102301

It was recently shown that fluctuations in the initial geometry of a heavy ion collision generally result in a dipole asymmetry of the distribution of outgoing particles. This asymmetry, unlike the usual directed flow, is expected to be present at a wide range of rapidity -- including midrapidity. First evidence of this phenomenon can be seen in recent two-particle correlation data by STAR, providing the last element necessary to quantitatively describe long-range dihadron correlations. We extract differential directed flow from these data and propose a new direct measurement.

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