arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.03013hep-phhep-th
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软夸克软函数的重整化和标度演化

Renormalization and Scale Evolution of the Soft-Quark Soft Function

Ze Long Liu, Bianka Mecaj, Matthias Neubert, Xing Wang, Sean Fleming

摘要:

用威尔逊线修饰的软场的矩阵元定义的软函数是对撞机和重夸克物理中截面和衰变率因子分解定理的核心组成部分。虽然在许多情况下,相关的软函数定义的胶子运营商,在次领先的顺序在功率计数软函数包含夸克领域出现。我们提出了一个详细的讨论的性质的软夸克软功能的夸克传播打扮由两个有限长的威尔逊线连接在一个点。这个函数进入了由光夸克环介导的$h\toγγ$过程的希格斯玻色子衰变振幅的因式分解定理。我们进行重整化的软功能在一个循环的顺序,推导出它的两个循环的反常尺寸和讨论解决方案的重整化群演化方程在动量空间,拉普拉斯空间和“对角空间”,其中的演化是严格的乘法。

英文摘要:

Soft functions defined in terms of matrix elements of soft fields dressed by Wilson lines are central components of factorization theorems for cross sections and decay rates in collider and heavy-quark physics. While in many cases the relevant soft functions are defined in terms of gluon operators, at subleading order in power counting soft functions containing quark fields appear. We present a detailed discussion of the properties of the soft-quark soft function consisting of a quark propagator dressed by two finite-length Wilson lines connecting at one point. This function enters in the factorization theorem for the Higgs-boson decay amplitude of the $h\toγγ$ process mediated by light-quark loops. We perform the renormalization of this soft function at one-loop order, derive its two-loop anomalous dimension and discuss solutions to its renormalization-group evolution equation in momentum space, in Laplace space and in the "diagonal space", where the evolution is strictly multiplicative.

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