Orbital structure of quarks inside the nucleon in the light-cone diquark model
- Department of Physics, Southeast University, Nanjing 211189 (China)
- Departamento de Fisica, Universidad Tecnica Federico Santa Maria, and Centro Cientifico-Tecnologico de Valparaiso Casilla 110-V, Valparaiso (Chile)
We study the orbital angular momentum structure of the quarks inside the proton. By employing the light-cone diquark model and the overlap representation formalism, we calculate the chiral-even generalized parton distribution functions H{sub q}(x,{xi},{Delta}{sup 2}), H-tilde{sub q}(x,{xi},{Delta}{sup 2}), and E{sub q}(x,{xi},{Delta}{sup 2}) at zero skewedness for q=u and d quarks. In our model, E{sub u} and E{sub d} have opposite sign with similar size. Those generalized parton distribution functions are applied to calculate the orbital angular momentum distributions, showing that L{sub u}(x) is positive, while L{sub d}(x) is consistent with zero compared with L{sub u}(x). We introduce the impact parameter dependence of the quark orbital angular momentum distribution. It describes the position space distribution of the quark orbital angular momentum at given x. We found that the impact parameter dependence of the quark orbital angular momentum distribution is axially symmetric in the light-cone diquark model.
- OSTI ID:
- 21503784
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 82, Issue 9; Other Information: DOI: 10.1103/PhysRevD.82.094005; (c) 2010 American Institute of Physics; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AXIAL SYMMETRY
CHIRALITY
COMPUTERIZED SIMULATION
D QUARKS
DISTRIBUTION
DISTRIBUTION FUNCTIONS
IMPACT PARAMETER
ORBITAL ANGULAR MOMENTUM
PROTONS
ANGULAR MOMENTUM
BARYONS
ELEMENTARY PARTICLES
FERMIONS
FUNCTIONS
HADRONS
NUCLEONS
PARTICLE PROPERTIES
QUARKS
SIMULATION
SYMMETRY