论文标题
顺序BREMSSTRAHLUNG中的LPM效应：QCD的“瞬时”相互作用的结合
The LPM effect in sequential bremsstrahlung: incorporation of "instantaneous'' interactions for QCD
论文作者
论文摘要
Bremsstrahlung的分裂过程和培养基中的配对产生在非常高的能量极限的大距离内相干，这导致了一种被称为Landau-Pomeranchuk-Migdal（LPM）效应的抑制作用。当两个连续分裂过程的相干长度（形成长度）重叠时，我们继续研究案例，避免了软排放近似。先前的工作对``几乎完整''计算了重叠的形成时间对诸如$ g \ to gg \ to ggg $之类的gg \ $的影响（具有简化的假设，例如Infinite QCD介质和大$ N_C $限制）。在本文中，我们将这些先前的速率计算从几乎完全完整地扩展到完成，包括涉及纵向旋转元素的过程。在LightCone的衰落理论的背景下，以前用于``几乎完整''计算，此类交换在LightCone时是瞬时的，并且具有自己的图表表示。
The splitting processes of bremsstrahlung and pair production in a medium are coherent over large distances in the very high energy limit, which leads to a suppression known as the Landau-Pomeranchuk-Migdal (LPM) effect. We continue study of the case when the coherence lengths (formation lengths) of two consecutive splitting processes overlap, avoiding soft-emission approximations. Previous work made a ``nearly-complete'' calculation of the effect of overlapping formation times on gluonic splittings such as $g \to gg \to ggg$ (with simplifying assumptions such as an infinite QCD medium and the large-$N_c$ limit). In this paper, we extend those previous rate calculations from nearly-complete to complete by including processes involving the exchange of longitudinally-polarized gluons. In the context of Lightcone Pertubation Theory, used earlier for the ``nearly-complete'' calculation, such exchanges are instantaneous in lightcone time and have their own diagrammatic representation.
