Directed and Elliptic Flow at RHIC

Abstract

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 ($3-6GeV/c$) 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.

6 pages, 4 figures. Proceeding for Hot Quark 04 conference Changes in the revision are mostly English fixes. v1 versus eta plot is flipped over to follow the convention

References in corpus (3)

• Azimuthal anisotropy at RHIC: the first and fourth harmonics
• Flow in Au+Au Collisions at RHIC
• Azimuthal anisotropy and correlations in p+p, d+Au and Au+Au collisions at 200 GeV

Cited by in corpus (1)

• Directed flow as effect of transient matter rotation in hadron and nucleus collisions