论文标题

中型辐射的统一图片

A unified picture of medium-induced radiation

论文作者

Isaksen, Johannes Hamre, Takacs, Adam, Tywoniuk, Konrad

论文摘要

我们重新审视喷气机在夸克 - 格鲁隆等离子体中繁殖的图片。除了真空辐射外,partons散布在导致诱导排放的中等成分上。传统上,包括这些相互作用的分析方法分别处理了多个,软或罕见的硬散射。到目前为止,只有使用数值方法可用的完整描述。我们实现了相关量表的完全分析控制,并绘制出完整相空间中的主要物理过程。为此,我们将中型诱导频谱的现有扩展方案扩展到了伯特勒制度。这涵盖了从早期到后期的整个相空间,从硬分裂到低于热尺度的排放。基于量表的分离,自然会出现时空图片:在早期,诱发的排放开始从培养基的稀有散射中产生。在稍后的阶段,由于多个软散射而引起的诱导排放导致湍流级联反应迅速将能量降低到并包括伯特勒(Bethe-Heitler)状态。与当前的最新分解相比,我们量化了这种改进的图像的影响,而最新的分解仅包括软散射,通过分析方法和数值方法,用于中等诱导的能量分布函数。我们的工作旨在提高我们对从小型系统到大型系统的喷气淬火的理解,以及对蒙特卡洛发电机的未来升级。

We revisit the picture of jets propagating in the quark-gluon plasma. In addition to vacuum radiation, partons scatter on the medium constituents resulting in induced emissions. Analytical approaches to including these interactions have traditionally dealt separately with multiple, soft, or rare, hard scatterings. A full description has so far only been available using numerical methods. We achieve full analytical control of the relevant scales and map out the dominant physical processes in the full phase space. To this aim, we extend existing expansion schemes for the medium-induced spectrum to the Bethe--Heitler regime. This covers the whole phase space from early to late times, and from hard splittings to emissions below the thermal scale. Based on the separation of scales, a space-time picture naturally emerges: at early times, induced emissions start to build from rare scatterings with the medium. At a later stage, induced emissions due to multiple soft scatterings result in a turbulent cascade that rapidly degrades energy down to, and including, the Bethe--Heitler regime. We quantify the impact of such an improved picture, compared to the current state-of-the-art factorization that includes only soft scatterings, by both analytical and numerical methods for the medium-induced energy distribution function. Our work serves to improve our understanding of jet quenching from small to large systems and for future upgrades of Monte Carlo generators.

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