The proton spin decomposition : path dependence and gauge symmetry - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Conference Papers Year : 2014

The proton spin decomposition : path dependence and gauge symmetry

Abstract

We discuss the different types of decomposition of the proton spin. We stress that, despite their lack of uniqueness, the Chen et al. and Wakamatsu decompositions are perfectly measurable. We argue that a large part of the recent controversies boils down to the fact that there actually exist two types of gauge transformations in the Chen et al. approach, where physical and gauge degrees of freedom of the gauge potential are explicitly separated. By carefully distinguishing these two types of gauge transformations, one can easily understand how the concepts of gauge invariance, Stueckelberg symmetry, path dependence and measurability are linked to each other.

Dates and versions

in2p3-00854631 , version 1 (27-08-2013)

Identifiers

Cite

C. Lorcé. The proton spin decomposition : path dependence and gauge symmetry. QCD Evolution Workshop, May 2013, Newport News, United States. pp.1460030, ⟨10.1142/S2010194514600301⟩. ⟨in2p3-00854631⟩
18 View
0 Download

Altmetric

Share

Gmail Facebook X LinkedIn More