Article ID Journal Published Year Pages File Type
1837342 Nuclear Physics A 2014 13 Pages PDF
Abstract

Exploring the similarities between the Chen et al. approach, where physical and gauge degrees of freedom of the gauge potential are explicitly separated, and the background field method, we provide an alternative point of view to the proton spin decomposition issue. We show in particular that the gauge symmetry can be realized in two different ways, and discuss the relations between the concepts of path dependence, Stueckelberg dependence and background dependence. Finally, we argue that path/Stueckelberg/background-dependent decompositions of the proton spin are in principle measurable and therefore physically meaningful.

Related Topics
Physical Sciences and Engineering Physics and Astronomy Nuclear and High Energy Physics
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