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arXiv 1107.0291hep-ph
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介质诱导$q {\bar q}$天线QCD辐射的质量效应和相干性

Mass effect and coherence in medium-induced QCD radiation off a $q {\bar q}$ antenna

Néstor Armesto, Hao Ma, Yacine Mehtar-Tani, Carlos A. Salgado, Konrad Tywoniuk

摘要:

本文计算了大质量夸克-反夸克($q {\bar q}$)天线穿过有色QCD介质时的介质诱导单胶子辐射谱。在一阶不透明度展开下计算的天线外胶子谱是共线有限的,但红外发散,这与从一个独立辐射源得到的既红外又共线有限的结果不同。当天线张角较小时,发射胶子较软时,发射体间的干涉对软胶子辐射起主导作用;而当天线张角较大时,发射体间的干涉对硬胶子辐射起主导作用。作为一个唯象的结果,我们调查的能量损失的射弹由于辐射。一般来说,两种情况下的质量效应的大小是相似的。

英文摘要:

The medium-induced one-gluon radiation spectrum off a massive quark-antiquark ($q {\bar q}$) antenna traversing a colored QCD medium is calculated in this contribution. The gluon spectrum off the antenna computed at first order in the opacity expansion is collinear finite but infrared divergent, which is different from the result obtained from an independent emitter which is both infrared and collinear finite. The interference between emitters dominates the soft gluon radiation when the antenna opening angle is small and the emitted gluon is soft, whereas the antenna behaves like a superposition of independent emitters when the opening angle is large and the radiated gluon is hard. As a phenomenological consequence, we investigate the energy lost by the projectiles due to the radiation. In general, the size of the mass effects is similar in both cases.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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