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arXiv 0907.1918hep-ph
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有限尺寸夸克-胶子等离子体中辐射夸克能量损失的反常质量依赖

Anomalous mass dependence of radiative quark energy loss in a finite-size quark-gluon plasma

P. Aurenche, B. G. Zakharov

摘要:

我们证明了对于有限尺寸的夸克-胶子等离子体,当胶子形成长度与等离子体的尺寸相当或超过等离子体的尺寸时,重夸克诱导的胶子辐射比轻夸克诱导的胶子辐射强.这种效应是由于介质中$q\to gq$跃迁的光锥波函数的振荡引起的。Dokshitzer和Kharzeev忽略量子有限尺寸效应的死锥模型在这一区域是不成立的。有限尺寸效应也增强了重夸克的光子发射。

英文摘要:

We demonstrate that for a finite-size quark-gluon plasma the induced gluon radiation from heavy quarks is stronger than that for light quarks when the gluon formation length becomes comparable with (or exceeds) the size of the plasma. The effect is due to oscillations of the light-cone wave function for the in-medium $q\to gq$ transition. The dead cone model by Dokshitzer and Kharzeev neglecting quantum finite-size effects is not valid in this regime. The finite-size effects also enhance the photon emission from heavy quarks.

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