Are there infinitely many decompositions of the nucleon spin ?

Abstract

We argue against the rapidly spreading idea of gauge-invariant-extension (GIE) approach in the nucleon spin decomposition problem, which implies the existence of infinitely many gauge-invariant decomposition of the nucleon spin.

Comments: To appear in the proceedings of the QCD Evolution 2013, May 6-10, 2013, JLab, Newport News, USA. Includes ws-ijmpcs.cls