对林惠文、刘克飞关于“夸克和胶子angular momentum定义的争论“一文的答复。组长（arXiv：1111.0678，PRD 83，096012（2011））
Reply to the comment of Huey-Wen Lin and Keh-Fei Liu on "Controversy concerning the definition of quark and gluon angular momentum" by E. Leader (arXiv:1111.0678, PRD 83, 096012 (2011))
摘要：
Lin和Liu计算了格点上非规范不变正则夸克动量算符的核子期望值，得到零。他们的结论是，我的论点，尽管非规范不变的运营商，其物理矩阵元素\emph{are}规范不变，不能正确。我表明，他们的结果没有关系的规范不变性的问题，也指出一个有趣的晶格悖论。
英文摘要：
Lin and Liu evaluate the nucleon expectation value of the non gauge-invariant canonical quark momentum operator on a lattice, and obtain zero. They conclude that my argument that, despite the non gauge-invariance of the operator, its physical matrix elements \emph{are} gauge-invariant, cannot be correct. I show that their result has no bearing on the question of gauge-invariance, and also point to an amusing lattice paradox.
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