Corrigendum to “The angular momentum controversy: What's it all about and does it matter?” (The angular momentum controversy: What's it all about and does it matter? (2014) 541(3) (163–248), (S0370157314001185), (10.1016/j.physrep.2014.02.010))

A major issue Our review aimed to clarify the controversy generated by the presentation in the literature of several competing versions of the expressions for the quark and gluon spin and orbital angular momentum operators. In particular we wished to discuss whether it was really possible to split the angular momentum of a photon and gluon into gauge invariant spin and orbital parts, something forbidden in standard textbooks. In Section 2 we presented a Pedagogical Introduction to the subject, but neglected to explain a crucial point vital to any discussion of whether some set of operators could legitimately be considered as “angular momentum” operators.