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arXiv 1106.3864hep-ph
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介质感应辐射中的干涉现象

Interference Phenomena in Medium Induced Radiation

Jorge Casalderrey-Solana, Edmond Iancu

摘要:

本文研究了嵌入具有$L$尺寸和"喷注猝灭"参数$\hat q$的QCD介质中的色单重夸克-反夸克天线产生的介质诱导胶子辐射的干涉图样。在BDMPS-Z体系中,我们证明了对于偶极张开角$θ_{q\bar q} \ggθ_c\equiv {2}/{\sqrt{\hat q L^3}}$,介质诱导的夸克和反夸克胶子发射之间的干扰相对于直接发射被抑制。这是因为直接发射在整个介质中是离域的,因此产生与$L$成比例的贡献,而干扰只发生在早期的发射之间,此时两个源保持相干。因此,对于$\tqq \ggθ_c$,介质感应辐射是夸克和反夸克单独产生的两个光谱的总和,没有角序等相干效应。对于$\tqq \llθ_c$,介质感应辐射消失。

英文摘要:

We consider the interference pattern for the medium-induced gluon radiation produced by a color singlet quark-antiquark antenna embedded in a QCD medium with size $L$ and `jet quenching' parameter $\hat q$. Within the BDMPS-Z regime, we demonstrate that, for a dipole opening angle $θ_{q\bar q} \ggθ_c\equiv {2}/{\sqrt{\hat q L^3}}$, the interference between the medium--induced gluon emissions by the quark and the antiquark is suppressed with respect to the direct emissions. This is so since direct emissions are delocalized throughout the medium and thus yield contributions proportional to $L$ while interference occurs only between emissions at early times, when both sources remain coherent. Thus, for $\tqq \ggθ_c$, the medium-induced radiation is the sum of the two spectra individually produced by the quark and the antiquark, without coherence effects like angular ordering. For $\tqq \llθ_c$, the medium--induced radiation vanishes.

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