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arXiv 0812.1478hep-ph
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在相对论重离子对撞机(BNL)上利用能区直接光子测量夸克-胶子等离子体的各向同性时间

Measuring the isotropization time of quark-gluon plasma from direct photons at energies available at the BNL Relativistic Heavy Ion Collider (RHIC)

Lusaka Bhattacharya, Pradip Roy

摘要:

考虑到{ \em Quark-Gluon-Plasma}(QGP)的初态动量各向异性和后期横向流效应,计算了不同来源的直达光子的横向动量分布.的总光子产额,计算的初始条件,过渡温度的各种组合,然后与最近测量的光子横向动量分布的PHENIX合作。结果表明,这种各向异性的存在下,可以更好地描述PHENIX光子数据比各向同性的情况下。我们表明,各向同性化时间,从而提取仍然是1 fm/c的顺序,几乎是不敏感的初始条件。

英文摘要:

We calculate transverse momentum distribution of direct photons from various sources by taking into account the initial state momentum anisotropy of {\em Quark-Gluon-Plasma} (QGP) and late stage transverse flow effects. The total photon yield, calculated for various combinations of initial conditions, transition temperatures, is then compared with the recent measurement of photon transverse momentum distribution by the PHENIX collaboration. It is shown that the presence of such an anisotropy can describe the PHENIX photon data better than the isotropic case. We show that the isotropization time thus extracted remains of the order of 1 fm/c and is almost insensitive to the initial conditions used.

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