论文标题
颜色进化和红外物理
Colour Evolution and Infrared Physics
论文作者
论文摘要
我们完整地说明了颜色空间中柔软的gluon，无质量的夸克，演变方程，从分解到硬截面密度运算符和软函数编码测量值以及对确定颜色的投影。我们将这种形式主义详细介绍到两个循环级别，并演示了进化核与红外减法的关系，以及如何与可观察到的算法应预测的红外奇异区域的分辨率共谋。后者使我们能够在不同的运动学变量中解决进化，包括能量顺序和非全球可观察物中的角度截止。软因素及其演变类似于一个强发模型，包括诸如颜色重新连接之类的效果，并且可以深入了解需要柔软的gluon演化的可观察到的功率校正结构。
We give a complete account of how soft gluon, massless quark, evolution equations in colour space originate, from a factorization into a hard cross section density operator and a soft function encoding measurements and the projection on definite colours. We detail this formalism up to the two loop level and we demonstrate how the evolution kernels relate to infrared subtractions, and how the resolution of infrared singular regions conspires with the structure of observables the algorithm should be able to predict. The latter allows us to address evolution in different kinematic variables, including energy ordering and angular cutoffs in non-global observables. The soft factor and its evolution resembles a hadronization model including effects such as colour reconnection, and could give insight into the structure of power corrections in observables which require soft gluon evolution.
