Implications of color gauge symmetry for nucleon spin structure
Aug, 19988 pages
Published in:
- Phys.Rev.D 59 (1999) 074010
e-Print:
- hep-ph/9808305 [hep-ph]
Report number:
- UMD-PP-99-012,
- DOE-ER-40762-158
Citations per year
Abstract:
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 orbital angular momentum operators do not have gauge-independent matrix element; 2) the evolution equations for the gluon spin take very different forms in the Feynman and axial gauges, but yield the same leading behavior in the asymptotic limit; 3) the complete evolution of the gauge-dependent orbital angular momenta appears intractable in the light-cone gauge. We define a new gluon orbital angular momentum distribution which {\it is} an experimental observable and has a simple scale evolution. However, its physical interpretation makes sense only in the light-cone gauge just like the gluon helicity distribution y.- nucleon: spin
- quantum chromodynamics
- invariance: gauge
- helicity
- spin: orbit
- angular momentum
- gluon: spin
- transformation: gauge
- light cone
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