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arXiv 1303.6487hep-ph
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超短电磁脉冲下的Breit-Wheeler过程

Breit-Wheeler process in very short electromagnetic pulses

A. I. Titov, B. Kampfer, H. Takabe, A. Hosaka

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32 pages, 15 figures
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摘要：

广义Breit-Wheeler过程，即$e^+e^-$对的发射离开通过偏振短脉冲电磁波（例如，激光）波场的分析。我们表明，生产概率是由两个动力学效应的相互作用。第一个与脉冲的形状和持续时间有关，第二个是$e^\pm$与强电磁场相互作用的非线性动力学。第一种效应在弱场区表现得最为明显，在弱场区，小场强被有限时空区域内电磁场的快速变化所补偿，这增强了少光子事件，并且与无限长脉冲相比，可以将产生概率提高几个数量级。因此，短脉冲可以被认为是一个强大的放大器。多光子Breit-Wheeler机制中的非线性动力学在大场强下起决定性作用，其中脉冲形状和持续时间的影响不太重要。在过渡制度中，必须同时考虑到这两种影响。我们提供了合适的表达式的$e^+e^-$生产概率的运动区域，可用于运输代码。

英文摘要：

The generalized Breit-Wheeler process, i.e. the emission of $e^+e^-$ pairs off a probe photon propagating through a polarized short-pulsed electromagnetic (e.g.\ laser) wave field, is analyzed. We show that the production probability is determined by the interplay of two dynamical effects. The first one is related to the shape and duration of the pulse and the second one is the non-linear dynamics of the interaction of $e^\pm$ with the strong electromagnetic field. The first effect manifests itself most clearly in the weak-field regime, where the small field intensity is compensated by the rapid variation of the electromagnetic field in a limited space-time region, which intensifies the few-photon events and can enhance the production probability by orders of magnitude compared to an infinitely long pulse. Therefore, short pulses may be considered as a powerful amplifier. The non-linear dynamics in the multi-photon Breit-Wheeler regime plays a decisive role at large field intensities, where effects of the pulse shape and duration are less important. In the transition regime, both effects must be taken into account simultaneously. We provide suitable expressions for the $e^+e^-$ production probability for kinematic regions which can be used in transport codes.

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