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Is constituent quark scaling a unique sign of parton recombination?

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Abstract

We study the transverse momentum dependence of the anisotropic flow v2 for π, K, nucleon, Λ, Ξ and Ω for Au+Au collisions at \(\sqrt{s_{NN}} = 200\,\mathrm{GeV}\) within two independent string-hadron transport approaches (RQMD and UrQMD). Although both models reach only 60% of the absolute magnitude of the measured v2, they both predict the particle-type dependence of v2 as observed by the RHIC experiments: v2 exhibits a hadron-mass hierarchy in the low pT region and a number-of-constituent-quark (NCQ) dependence in the intermediate pT region. The failure of the hadronic models to reproduce the absolute magnitude of the observed v2 indicates that transport calculations of heavy-ion collisions at RHIC must incorporate interactions among quarks and gluons in the early, hot and dense phase. The presence of an NCQ scaling in the string-hadron model results suggests that the particle-type dependences observed in heavy-ion collisions at intermediate pT might be related to the hadronic cross sections in vacuum rather than to the hadronization process itself.

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Authors and Affiliations

  1. Institut für Theoretische Physik, J.W. Goethe Universität, Max von Laue Strasse 1, 60438, Frankfurt am Main, Germany

    M. Bleicher

  2. Frankfurt Institute for Advanced Studies (FIAS), Max von Laue Strasse 1, 60438, Frankfurt am Main, Germany

    X. Zhu

  3. Physics Department, Tsinghua University, Beijing, 100084, China

    X. Zhu

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  1. M. Bleicher
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  2. X. Zhu
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Correspondence to M. Bleicher.

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Bleicher, M., Zhu, X. Is constituent quark scaling a unique sign of parton recombination?. Eur. Phys. J. C 49, 303–308 (2007). https://doi.org/10.1140/epjc/s10052-006-0125-2

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  • DOI: https://doi.org/10.1140/epjc/s10052-006-0125-2

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