Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 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))   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.

34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con