Pseudorapidity dependence of anisotropic flows in relativistic heavy-ion collisions

Pseudorapidity dependence of anisotropic flows in relativistic heavy-ion collisions
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相对论性重离子碰撞中各向异性流的赝快速依赖性

DOI:
10.1016/j.physletb.2004.11.017
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发表时间:
2004-08
期刊:
影响因子:
4.4
通讯作者:
第一作者
第一作者
中科院分区:
物理与天体物理2区
文献类型:
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作者:
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在多相输运模型下研究了相对论重离子对撞机上重离子碰撞中带电强子各向异性流v1、v2、v3和v4的赝快度依赖性。我们发现,虽然弦熔化的情况下,强子预计将形成从初始弦转换到它们的价夸克和反夸克,可以解释测量的p T依赖的v2和v4的带电强子在中快度的部分子散射截面约为10 mb,在没有弦熔化的情况下,较好地再现了s= 200 AGeV的Au+Au碰撞中大赝快度带电强子的v1和v2的最新数据.因此,我们的研究结果表明,部分子的物质形成在早期阶段的相对论重离子碰撞只在midrapidity和字符串仍然占主导地位,在大rapidities。我们还预言了在正向赝快度下带电强子的v_1、v_2、v_3和v_4与pT的关系,发现在大赝快度下v_1和v_2是可观的,而高阶各向异性流v_3和v_4基本上为零。
The pseudorapidity dependence of anisotropic flows v1, v2, v3and v4of charged hadrons in heavy-ion collisions at the relativistic heavy-ion collider is studied in a multi-phase transport model. We find that while the string melting scenario, in which hadrons that are expected to be formed from initial strings are converted to their valence quarks and antiquarks, can explain the measured pT-dependence of v2and v4of charged hadrons at midrapidity with a parton scattering cross section of about 10 mb, the scenario without string melting reproduces better the recent data on v1and v2of charged hadrons at large pseudorapidity in Au+Au collisions at s=200AGeV. Our results thus suggest that a partonic matter is formed during early stage of relativistic heavy-ion collisions only around midrapidity and that strings remain dominant at large rapidities. The pT-dependence of v1, v2, v3and v4for charged hadrons at forward pseudorapidity is also predicted, and we find that while v1and v2are appreciable at large pseudorapidity the higher-order anisotropic flows v3and v4are essentially zero.
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