dorsal/arxiv
View SchemaAnisotropic flow at RHIC: How unique is the number-of-constituent-quark scaling?
| Authors | Y. Lu, M. Bleicher, F. Liu, Z. Liu, H. Petersen, P. Sorensen, H. Stoecker, N. Xu, X. Zhu |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0602009 |
| URL | https://arxiv.org/abs/nucl-th/0602009 |
| DOI | 10.1088/0954-3899/32/8/004 |
| Journal | J.Phys.G32:1121-1130,2006 |
Abstract
The transverse momentum dependence of the anisotropic flow $v_2$ for $\pi$, $K$, nucleon, $\Lambda$, $\Xi$ and $\Omega$ is studied for Au+Au collisions at $\sqrt{s_{\rm NN}} = 200$ GeV within two independent string-hadron transport approaches (RQMD and UrQMD). Although both models reach only 60% of the absolute magnitude of the measured $v_2$, they both predict the particle type dependence of $v_2$, as observed by the RHIC experiments: $v_2$ exhibits a hadron-mass hierarchy (HMH) in the low $p_T$ region and a number-of-constituent-quark (NCQ) dependence in the intermediate $p_T$ region. The failure of the hadronic models to reproduce the absolute magnitude of the observed $v_2$ 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 dependencies observed in heavy-ion collisions at intermediate $p_T$ might be related to the hadronic cross sections in vacuum rather than to the hadronization process itself.
{
"annotation_id": "49adf817-02d3-47aa-a687-fcffc8144093",
"date_created": "2026-03-02T18:00:07.828000Z",
"date_modified": "2026-03-02T18:00:07.828000Z",
"file_hash": "561fab9b2efa603233850475a7b94f2362a59838905558c4208d3dba993a3267",
"private": false,
"record": {
"abstract": "The transverse momentum dependence of the anisotropic flow $v_2$ for $\\pi$,\n$K$, nucleon, $\\Lambda$, $\\Xi$ and $\\Omega$ is studied for Au+Au collisions at\n$\\sqrt{s_{\\rm NN}} = 200$ GeV within two independent string-hadron transport\napproaches (RQMD and UrQMD). Although both models reach only 60% of the\nabsolute magnitude of the measured $v_2$, they both predict the particle type\ndependence of $v_2$, as observed by the RHIC experiments: $v_2$ exhibits a\nhadron-mass hierarchy (HMH) in the low $p_T$ region and a\nnumber-of-constituent-quark (NCQ) dependence in the intermediate $p_T$ region.\nThe failure of the hadronic models to reproduce the absolute magnitude of the\nobserved $v_2$ indicates that transport calculations of heavy ion collisions at\nRHIC must incorporate interactions among quarks and gluons in the early, hot\nand dense phase. The presence of an NCQ scaling in the string-hadron model\nresults suggests that the particle-type dependencies observed in heavy-ion\ncollisions at intermediate $p_T$ might be related to the hadronic cross\nsections in vacuum rather than to the hadronization process itself.",
"arxiv_id": "nucl-th/0602009",
"authors": [
"Y. Lu",
"M. Bleicher",
"F. Liu",
"Z. Liu",
"H. Petersen",
"P. Sorensen",
"H. Stoecker",
"N. Xu",
"X. Zhu"
],
"categories": [
"nucl-th"
],
"doi": "10.1088/0954-3899/32/8/004",
"journal_ref": "J.Phys.G32:1121-1130,2006",
"title": "Anisotropic flow at RHIC: How unique is the number-of-constituent-quark scaling?",
"url": "https://arxiv.org/abs/nucl-th/0602009"
},
"schema_id": "dorsal/arxiv",
"source": {
"execution_id": "95c445d1-b5c9-4f85-b12b-f9677f7b25ab",
"id": "arXiv Dataset IDs",
"type": "Model",
"variant": "snapshot-2026-03-01",
"version": "0.1.0"
},
"user_id": 1000002
}