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首页> 外文期刊>Journal of High Energy Physics >An effective theory for jet propagation in dense QCD matter: jet broadening and medium-induced bremsstrahlung
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An effective theory for jet propagation in dense QCD matter: jet broadening and medium-induced bremsstrahlung

机译：致密QCD物质中射流传播的有效理论：射流展宽和中致致辐射

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摘要

Two effects, jet broadening and gluon bremsstrahlung induced by the propagation of a highly energetic quark in dense QCD matter, are reconsidered from effective theory point of view. We modify the standard Soft Collinear Effective Theory (SCET) Lagrangian to include Glauber modes, which are needed to implement the interactions between the medium and the collinear fields. We derive the Feynman rules for this Lagrangian and show that it is invariant under soft and collinear gauge transformations. We find that the newly constructed theory SCETG recovers exactly the general result for the transverse momentum broadening of jets. In the limit where the radiated gluons are significantly less energetic than the parent quark, we obtain a jet energy-loss kernel identical to the one discussed in the reaction operator approach to parton propagation in matter. In the framework of SCETG we present results for the fully-differential bremsstrahlung spectrum for both the incoherent and the Landau-Pomeranchunk-Migdal suppressed regimes beyond the soft-gluon approximation. Gauge invariance of the physics results is demonstrated explicitly by performing the calculations in both the light-cone and covariant R ξ gauges. We also show how the process-dependent medium-induced radiative corrections factorize from the jet production cross section on the example of the quark jets considered here.
机译：从有效的理论观点出发，重新考虑了两种效应，即高能夸克在致密QCD物质中的传播引起的射流加宽和胶子lu致辐射。我们修改了标准软共线有效理论（SCET）拉格朗日，以包括Glauber模式，这是实现介质和共线场之间相互作用的必要条件。我们推导了这个拉格朗日法则的费曼规则，并表明它在软规范和共线规范变换下是不变的。我们发现，新构建的理论SCET G 可以准确地恢复射流横向动量展宽的一般结果。在辐射胶子的能量显着低于父夸克的极限下，我们获得了一种射流能量损失内核，该能量损失内核与反应算符方法中讨论的质子在物质中传播的内核相同。在SCET G 的框架中，我们给出了非软胶体近似以外的非相干和Landau-Pomeranchunk-Migdal抑制状态的全微diff致辐射谱的结果。通过在光锥和协变R ξ量表中执行计算，可以清楚地证明物理结果的量规不变性。我们还将在此处考虑的夸克喷头示例中，显示与过程相关的介质诱导的辐射校正如何从喷头生产截面中分解出来。

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