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Extending Precision Perturbative QCD with Track Functions

Aug 11, 2022, 2:45 PM
15m
Oral report 强子物理与味物理 Parallel Session IX (2):Hadron and Flavor Physics

Speaker

Ms Yibei Li (Zhejiang University)

Description

高能实验中,相比于量能器,trackers上的测量具有更好的角度分辨率、能消除pileup,使得测量结果更精确。但理论微扰计算中,只考虑带电粒子(tracks)的观测量不是红外安全的,这说明基于带电粒子的观测量的计算需要考虑非微扰效应。所以,一个类似于碎裂函数的非微扰量被引入进来,称为track function,它能吸收微扰计算部分的红外发散。与碎裂函数不同的是,track function描述的是从一个硬部分子形成的喷注中带电强子的总能量分布,而不仅仅是单个强子的能量分布,这使得track function的重整化群演化形式比碎裂函数的要复杂,是非线性的。我们获得了track function的$\alpha_s^2$阶演化方程,同时,该方程第一次给出了$\alpha_s^2$阶的双强子碎裂函数演化方程、三强子碎裂函数演化方程等等,当然,该方程也可以退化成为传统的(单强子)碎裂函数的DGLAP演化方程。这为精度喷注子结构的研究铺路。另外,track function的$\alpha_s^2$阶演化方程在矩空间下的表达式及其在能量关联函数中的应用,相关讨论与结果已发表在PRL上(https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.128.182001)。

Primary author

Ms Yibei Li (Zhejiang University)

Co-authors

Mr Hao Chen (Zhejiang University) Dr Hua Xing Zhu (Zhejiang University) Dr Ian Moult (Yale University) Mr Max Jaarsma (University of Amsterdam) Dr Wouter Waalewijn (University of Amsterdam)

Presentation materials