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arXiv 2012.03256hep-phnucl-th
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N $^3$ LO的非极化夸克和胶子TMD PDF和FF

Unpolarized Quark and Gluon TMD PDFs and FFs at N$^3$LO

Ming-xing Luo, Tong-Zhi Yang, Hua Xing Zhu, Yu Jiao Zhu

摘要:

本文通过次-主导阶(N $^3$ LO)解析计算了非极化夸克和胶子横动量相关(TMD)的部分子分布函数(PDF)和碎裂函数(FF)的微扰匹配系数。N个$^3$ LO TMD PDF通过求解Feynman微分方程和相空间积分的系统来计算。考虑到TMD PDF和FF的概率解释,通过类空量到类时量的解析延拓得到TMD FF。TMD FF的系数函数在小动量分数$z$处表现出双对数增强。在$α_s$的展开式中,我们将这样的对数项恢复到三阶。我们的研究结果构成了在当前和未来的实验中精确确定TMD PDF和FF的重要成分。

英文摘要:

In this paper we calculate analytically the perturbative matching coefficients for unpolarized quark and gluon Transverse-Momentum-Dependent (TMD) Parton Distribution Functions (PDFs) and Fragmentation Functions (FFs) through Next-to-Next-to-Next-to-Leading Order (N$^3$LO) in QCD. The N$^3$LO TMD PDFs are calculated by solving a system of differential equation of Feynman and phase space integrals. The TMD FFs are obtained by analytic continuation from space-like quantities to time-like quantities, taking into account the probability interpretation of TMD PDFs and FFs properly. The coefficient functions for TMD FFs exhibit double logarithmic enhancement at small momentum fraction $z$. We resum such logarithmic terms to the third order in the expansion of $α_s$. Our results constitute important ingredients for precision determination of TMD PDFs and FFs in current and future experiments.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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