Generalized parton distribution functions and the nucleon spin sum rules in the chiral quark soliton model

Journal Article · Fri Apr 01 04:00:00 EST 2005 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.71.074001· OSTI ID:20708972

Wakamatsu, M; Tsujimoto, H ^[1]

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1. Department of Physics, Faculty of Science, Osaka University, Toyonaka, Osaka 560-0043 (Japan)

The theoretical predictions are given for the forward limit of the unpolarized spin-flip isovector generalized parton distribution function (E{sup u}-E{sup d})(x,{xi},t) within the framework of the chiral quark soliton model, with full inclusion of the polarization of Dirac sea quarks. We observe that [(H{sup u}-H{sup d})+(E{sup u}-E{sup d})](x,0,0) has a sharp peak around x=0, which we interpret as a signal of the importance of the pionic qq excitation with large spatial extension in the transverse direction. Another interesting indication given by the predicted distribution in combination with Ji's angular momentum sum rule is that the d quark carries more angular momentum than the u quark in the proton, which may have some relation with the physics of the violation of the Gottfried sum rule.

• OSTI ID: 20708972
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 7 Vol. 71; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CHIRAL SYMMETRY
CHIRALITY
D QUARKS
DISTRIBUTION
DISTRIBUTION FUNCTIONS
EXCITATION
ISOVECTORS
PARTON MODEL
PARTONS
POLARIZATION
PROTONS
SOLITONS
SPIN
SPIN FLIP
SUM RULES
U QUARKS