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Implications of Color Gauge Symmetry For Nucleon Spin Structure
Pervez Hoodbhoy, Xiangdong Ji, Wei Lu
We study the chromodynamical gauge symmetry in relation to the internal spin structure of the nucleon. We show that 1) even in the helicity eigenstates the gauge-dependent spin and…
Off-Forward Parton Distributions
Xiangdong Ji
Recently, there have been some interesting developments involving off-forward parton distributions of the nucleon, deeply virtual Compton scattering, and hard diffractive vector-me…
Quark Orbital-Angular-Momentum Distribution in the Nucleon
Pervez Hoodbhoy, Xiangdong Ji, Wei Lu
We introduce gauge-invariant quark and gluon angular momentum distributions after making a generalization of the angular momentum density operators. From the quark angular momentum…
A Modern Anatomy of Electron Mass
Xiangdong Ji, Wei Lu
Motivated by the need to understand hadron masses, we reexamine an old problem in QED - the composition of the electron mass - in a modern perspective. We find that in the unrenorm…
Helicity-Flip Off-Foward Parton Distributions of the Nucleon
Pervez Hoodbhoy, Xiangdong Ji
We identify quark and gluon helicity-flip distributions defined between nucleon states of unequal momenta. The evolution of these distributions with change of renormalization scale…
One-Loop Corrections and All Order Factorization In Deeply Virtual Compton Scattering
Xiangdong Ji, Jonathan Osborne
We calculate the one-loop corrections to a general off-forward deeply-virtual Compton process at leading twist for both parton helicity-dependent and independent cases. We show tha…