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Photons from the early stages of relativistic heavy-ion collisions

机译:来自相对论重离子碰撞的早期阶段的光子

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摘要

We present results about photon-production in relativistic heavy-ion collisions. The main novelty of our study is the calculation of the contribution of the early-stage photons to the photon spectrum. The initial stage is modeled by an ensemble of classical gluon fields which decay to a quark-gluon plasma via the Schwinger mechanism, and the evolution of the system is studied by coupling classical field equations to relativistic kinetic theory; photon production is then computed by including the pertinent collision processes into the collision integral. We find that the contribution of the early-stage photons to the direct photon spectrum is substantial for p(T) approximate to 2 GeV and higher, the exact value depending on the collision energy; therefore, we identify this part of the photon spectrum as the sign of the early stage. Moreover, the amount of photons produced during the early stage is not negligible with respect to those produced by a thermalized quark-gluon plasma: We support the idea that there is no dark age in relativistic heavy-ion collisions.
机译:我们在相对论的重离子碰撞中提出了关于光子生产的结果。我们研究的主要新颖性是计算早期光子对光子谱的贡献。初始阶段由经典胶原磁场的集合来建模,该胶原磁场通过Schwinger机构衰减到夸克 - 胶质等离子体,并且通过将经典场方程耦合到相对论的动力学理论,研究了系统的演化;然后通过将相关的碰撞过程包括在碰撞积分中来计算光子生产。我们发现早期光子对直接光子谱的贡献对于P(t)近似为2 GEV和更高,根据碰撞能量的精确值是基本的;因此,我们将光子谱的这部分标识为早期阶段的标志。此外,在早期产生的光子的量与热化夸克 - 胶质血管等离子体产生的那些不可能忽略:我们支持不存在相对论的重离子碰撞中没有深色的想法。

著录项

  • 来源
    《Physical review, C》 |2017年第1期|共10页
  • 作者单位

    Univ Catania Dept Phys &

    Astron Via Santa Sofia 64 I-95123 Catania Italy;

    Univ Chinese Acad Sci Coll Phys Yuquanlu 19A Beijing 100049 Peoples R China;

    Univ Catania Dept Phys &

    Astron Via Santa Sofia 64 I-95125 Catania Italy;

    INFN Lab Nazl Sud Via Santa Sofia 62 I-95123 Catania Italy;

    Univ Chinese Acad Sci Coll Phys Yuquanlu 19A Beijing 100049 Peoples R China;

    INFN Lab Nazl Sud Via Santa Sofia 62 I-95123 Catania Italy;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 原子核物理学、高能物理学;
  • 关键词

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