2014/09/01 by S. C. Tiwari, Tiwari, S. C.
Physics and Astronomy · #Black Holes and Theoretical Physics #FOS: Physical sciences #General Physics (physics.gen-ph) #History and Philosophy of Physics (physics.hist-ph) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.1503.02053
openalex publication_date 2014/09/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In this brief note insightful remarks are made on the controversy on the decomposition of the proton spin into the spin and orbital angular momenta of quarks and gluons. It is argued that the difference in the perception on the nature of the problem is the main reason for the persistent disputes. There is no decomposition that simultaneously satisfies the twin principles of manifest Lorentz covariance and gauge invariance, and partial considerations hide likely inconsistencies. It is suggested that field equations and matter (i. e. electron in QED and quarks in QCD) equations must be analyzed afresh rather than beginning with the expressions of total angular momentum; canonical or otherwise.