Directed and Elliptic Flow at RHIC

Details Directed and Elliptic Flow at RHIC Directed and Elliptic Flow at RHIC

2004-09-28

arxiv.org/abs/nucl-ex/0409029v2

J.Phys. G31 (2005) S35-S40

Physics

Nuclear Physics

Nuclear Experiment

6 pages, 4 figures. Proceeding for Hot Quark 04 conference Changes in the revision are mostly English fixes. v1 versus eta plo

Scientific paper

10.1088/0954-3899/31/4/005

We present the directed flow measurement ($v_1$) from Au+Au collisions at $\sqrtsNN = 62$ GeV. Over the pseudorapidity range we have studied, which covers $\eta$ from -1.2 to 1.2 and $2.4 < |\eta| < 4$, the magnitude of $v_1$ for charged particles is found to increase monotonously with pseudorapidity for all centralities. No ``$v_1$ wiggle'', as predicted by various theoretical models, is observed at midrapidity. Elliptic flow ($v_2$) from moderate high $p_t$ particles ($3-6 GeV/c$) at $\sqrtsNN = 200$ GeV is presented as a function of impact parameter. It is found that models that are based on {\it jet quenching} alone appear to underpredict $v_2$ at moderate high $p_t$, while the model that incorporates both, recombination and fragmentation, describes the data better.

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