| Centrality dependence of pT spectra for identified hadrons in Au+Au and Cu+Cu collisions at √sNN= 200GeV |
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| 作者姓名： | 王云飞 邵凤兰 宋军 魏德明 谢去病 |
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| 作者单位： | 1 Department of Physics, Qufu Normal University, Qufu 273165, China;2 Department of Physics, Shandong University, Jinan 250100, China |
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| 摘 要： | The centrality dependence of transverse momentum spectra for identified hadrons at midrapidity in Au+Au collisions at √sNN= 200GeV is systematically studied in a quark combination model. The pT spectra of π±, K±, p(p) and Λ(Λ) in different centrality bins and the nuclear modification factors (RCP) for these hadrons are calculated. The centrality dependence of the average collective transverse velocity 〈β(r)〉 for the hot and dense quark matter is obtained in Au+Au collisions, and it is applied to a relative smaller Cu+Cu collision system. The centrality dependence of pT spectra and the RCP for π0, Ks0 and Λ in Cu+Cu collisions at √sNN= 200GeV are well described. The results show that 〈β(r)〉 is only a function of the number of participants Npart and it is independent of the collision system.
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| 关 键 词： | relativistic high energy nucleus-nucleus collisions nuclear modification factor transverse collective flow quark combination model |
| 收稿时间： | 2008-04-01 |
| 修稿时间： | 2008-06-11 |
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