Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2008-07-09
Phys.Rev.Lett.101:252301,2008
Physics
Nuclear Physics
Nuclear Experiment
6 pages, 5 figures, submitted to Phys. Rev. Lett Systematical errors have been addressed in more detail in the new version
Scientific paper
10.1103/PhysRevLett.101.252301
We measure directed flow ($v_1$) for charged particles in Au+Au and Cu+Cu collisions at $\sqrt{s_{NN}} =$ 200 GeV and 62.4 GeV, as a function of pseudorapidity ($\eta$), transverse momentum ($p_t$) and collision centrality, based on data from the STAR experiment. We find that the directed flow depends on the incident energy but, contrary to all existing models, not on the size of the colliding system at a given centrality. We extend the validity of the limiting fragmentation concept to different collision systems, and investigate possible explanations for the observed sign change in $v_1(p_t)$.
Abelev Betty I.
STAR Collaboration
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