标题： 规范链接，TMD因子化，以及TMD因子化的破坏 显示英文标题

标题： Gauge links, TMD-factorization, and TMD-factorization breaking

摘要： 在本节中，我们讨论了横向动量依赖的或非积分的粒子分布函数的一些基本特征。 特别是，当这些关联函数与超出最简单情况的硬过程结合在因子化公式中时，存在关于普遍性和因子化的基本问题。 我们也将讨论其中一些问题以及它们所提供的机会。 显示英文摘要

摘要： In this section, we discuss some basic features of transverse momentum dependent, or unintegrated, parton distribution functions. In particular, when these correlation functions are combined in a factorization formulae with hard processes beyond the simplest cases, there are basic problems with universality and factorization. We discuss some of these problems as well as the opportunities that they offer.