dorsal/arxiv
View SchemaParton coalescence at RHIC
| Authors | V. Greco, C. M. Ko, P. Levai |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0305024 |
| URL | https://arxiv.org/abs/nucl-th/0305024 |
| DOI | 10.1103/PhysRevC.68.034904 |
| Journal | Phys.Rev. C68 (2003) 034904 |
Abstract
Using a covariant coalescence model, we study hadron production in relativistic heavy ion collisions from both soft partons in the quark-gluon plasma and hard partons in minijets. Including transverse flow of soft partons and independent fragmentation of minijet partons, the model is able to describe available experimental data on pion, kaon, and antiproton spectra. The resulting antiproton to pion ratio is seen to increase at low transverse momenta and reaches a value of about one at intermediate transverse momenta, as observed in experimental data at RHIC. A similar dependence of the antikaon to pion ratio on transverse momentum is obtained, but it reaches a smaller value at intermediate transverse momenta. At high transverse momenta, the model predicts that both the antiproton to pion and the antikaon to pion ratio decrease and approach those given by the perturbative QCD. Both collective flow effect and coalescence of minijet partons with partons in the quark-gluon plasma affect significantly the spectra of hadrons with intermediate transverse momenta. Elliptic flows of protons, Lambdas, and Omegas have also been evaluated from partons with elliptic flows extracted from fitting measured pion and kaon elliptic flows, and they are found to be consistent with available experimental data.
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"abstract": "Using a covariant coalescence model, we study hadron production in\nrelativistic heavy ion collisions from both soft partons in the quark-gluon\nplasma and hard partons in minijets. Including transverse flow of soft partons\nand independent fragmentation of minijet partons, the model is able to describe\navailable experimental data on pion, kaon, and antiproton spectra. The\nresulting antiproton to pion ratio is seen to increase at low transverse\nmomenta and reaches a value of about one at intermediate transverse momenta, as\nobserved in experimental data at RHIC. A similar dependence of the antikaon to\npion ratio on transverse momentum is obtained, but it reaches a smaller value\nat intermediate transverse momenta. At high transverse momenta, the model\npredicts that both the antiproton to pion and the antikaon to pion ratio\ndecrease and approach those given by the perturbative QCD. Both collective flow\neffect and coalescence of minijet partons with partons in the quark-gluon\nplasma affect significantly the spectra of hadrons with intermediate transverse\nmomenta. Elliptic flows of protons, Lambdas, and Omegas have also been\nevaluated from partons with elliptic flows extracted from fitting measured pion\nand kaon elliptic flows, and they are found to be consistent with available\nexperimental data.",
"arxiv_id": "nucl-th/0305024",
"authors": [
"V. Greco",
"C. M. Ko",
"P. Levai"
],
"categories": [
"nucl-th",
"nucl-ex"
],
"doi": "10.1103/PhysRevC.68.034904",
"journal_ref": "Phys.Rev. C68 (2003) 034904",
"title": "Parton coalescence at RHIC",
"url": "https://arxiv.org/abs/nucl-th/0305024"
},
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