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arXiv 0712.0732hep-phnucl-th
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RHIC能核碰撞产生的电磁辐射

Electromagnetic radiation from nuclear collisions at RHIC energies

Simon Turbide, Charles Gale, Evan Frodermann, Ulrich Heinz

摘要:

用相对论流体力学方法模拟了RHIC能区重核碰撞中产生的热密强相互作用物质,并计算了这些事件中中快度产生的实光子和虚光子的谱.几个不同的来源被认为是,他们的相对重要性进行了比较。具体来说,我们包括射流破碎,射流等离子体相互作用,从热介质和原始硬碰撞的辐射发射。我们的计算始终考虑到射流能量损失,在AMY形式主义的评估。我们得到的光谱,核修正因子(R_AA),和方位各向异性(v_2)同意在RHIC的PHENIX合作进行的光子测量的结果。

英文摘要:

The hot and dense strongly interacting matter created in collisions of heavy nuclei at RHIC energies is modeled with relativistic hydrodynamics, and the spectra of real and virtual photons produced at mid-rapidity in these events are calculated. Several different sources are considered, and their relative importance is compared. Specifically, we include jet fragmentation, jet-plasma interactions, the emission of radiation from the thermal medium and from primordial hard collisions. Our calculations consistently take into account jet energy loss, as evaluated in the AMY formalism. We obtain results for the spectra, the nuclear modification factor (R_AA), and the azimuthal anisotropy (v_2) that agree with the photon measurements performed by the PHENIX collaboration at RHIC.

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