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arXiv 1707.08602nucl-thhep-ph
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$AA$碰撞中夸克-胶子等离子体共线光子发射的唯象

Phenomenology of collinear photon emission from quark-gluon plasma in $AA$ collisions

B. G. Zakharov

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6 pages, 2 figures
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摘要：

我们研究了运行耦合的作用和热夸克质量的变化对共线韧致辐射和湮灭对$AA$碰撞中光子发射的贡献的影响，该方案类似于我们以前的喷流猝灭分析中使用的方案。我们发现，对于热夸克质量为$m_q\sim 50-100$ MeV的情形，与$2\to 2$过程相加的高阶共线过程的贡献可以解释$\sqrt{s}=0.2$ TeV的Au+Au碰撞在$k_T\sim 2-3$ GeV的实验光子谱的相当一部分（$\sim 50$）.但对于$m_q=300$ MeV和HTL方案预测的热夸克质量，理论预测大大低估了实验谱。

英文摘要：

We study the role of running coupling and the effect of variation of the thermal quark mass on contribution of the collinear bremsstrahlung and annihilation to photon emission in $AA$ collisions in a scheme similar to that used in our previous jet quenching analyses. We find that for a scenario with the thermal quark mass $m_q\sim 50-100$ MeV contribution of the higher order collinear processes summed with the $2\to 2$ processes can explain a considerable part ($\sim 50$\%) of the experimental photon spectrum at $k_T\sim 2-3$ GeV for Au+Au collisions at $\sqrt{s}=0.2$ TeV. But for $m_q=300$ MeV and for the thermal quark mass predicted by the HTL scheme the theoretical predictions underestimate considerably the experimental spectrum.

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