Orbital angular momenta of quarks and gluons in the nucleon -- model-dependent versus model-independent extractions

Details Orbital angular momenta of quarks and gluons in the nucleon -- model-dependent versus model-independent extractions Orbital angular momenta of quarks and gluons in the nucleon -- model-dependent versus model-independent extractions

2011-10-21

arxiv.org/abs/1110.4670v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages., no figure, to appear in PACSpin2011 (Cairns, 20-24 June, 2011) conf. proc. (AIP)

Scientific paper

We demonstrate that there exist two kinds of gauge-invariant decompositions of the nucleon spin, which are physically inequivalent. The quark and gluon orbital angular momenta (OAMs) appearing in one decomposition are basically the canonical OAMs, while the quark and gluon OAMs appearing in another decomposition are called the dynamical OAMs. It is shown that the dynamical OAMs of quarks and gluons in the nucleon can be related to definite high-energy deep-inelastic-scattering observables. On the other hand, we conjecture that the canonical OAMs of quarks and gluon in the nucleon are model-dependent quantities, which is meaningful only within a specific theoretical model of the nucleon.

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