Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-04-08
Phys.Rev.D84:037501,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
The version accepted for publication in Physical Review D
Scientific paper
10.1103/PhysRevD.84.037501
In recent papers, we have established the existence of gauge-invariant decomposition of nucleon spin, each term of which can be related to known high-energy deep-inelastic-scattering observables. A subtlety remains, however, for the intrinsic spin part of gluons at the quantum level. In fact, it was sometimes claimed that the evolution of gluon spin depends on the gauge choice and its physical interpretation makes sense only in the light-cone gauge. In the present paper, we will demonstrate explicitly that the gluon spin operator appearing in our decomposition evolves gauge-independently and that it properly reproduces the familiar evolution equation for the 1st moments of polarized quark and gluon distributions obtained with the Altarelli-Parisi method, which cannot directly be checked by the standard operator expansion method.
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