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System-size independence of directed flow at the Relativistic Heavy-Ion Collider

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arxiv 0807.1518 v3 pith:HB2DLVPW submitted 2008-07-09 nucl-ex

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keywords directedflowcentralitycollisionchangechargedcollidercolliding
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abstract

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 $v_1(p_t)$.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. OpenAlex reports about 122 citations worldwide. Full citation record

  1. Rapidity dependence of mean transverse momentum fluctuation and decorrelation in baryon-dense medium

    nucl-th 2026-02 unverdicted novelty 5.0 of 10

    Mean transverse momentum fluctuations in baryon-rich matter are driven by energy and baryon density variations, remain robust to baryon diffusion, and show splitting between protons and antiprotons.

  2. Impact of particle production mechanisms on pseudorapidity distribution and directed flow in Au+Au and Cu+Cu collisions at $\sqrt{s_{NN}}$ = 19.6 GeV using AMPT model

    nucl-th 2025-06 conditional novelty 4.0 of 10

    String fragmentation parameters in the AMPT model change proton directed flow and its system-size dependence at 19.6 GeV, while leaving pions nearly unaffected.

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