Orbital angular momentum, spin fractions, and scenarios for the proton's spin-weighted parton distributions

Journal Article · Sun Jan 01 00:00:00 EST 1989 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.39.361· OSTI ID:6794261

Ramsey, G P; Qui, J; Richards, D; Sivers, D

New data from the European Muon Collaboration (EMC) on the spin-spin asymmetry in deep-inelastic lepton-proton scattering suggests that the total spin carried by valence quarks in a polarized proton may be approximately canceled by a strong negative polarization of the sea of q-barq pairs. The evolution in Q/sup 2/ of the fraction of proton spin carried by gluons depends on the initial spin fractions and it is possible to avoid the introduction of large orbital angular momentum by adopting a ''hybrid'' quark-Skyrme picture of the proton suggested by the EMC results.

• Research Organization: Department of Physics, Loyola University, Chicago, Illinois 60626
• OSTI ID: 6794261
• Journal Information: Phys. Rev. D; (United States), Vol. 39:1
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
LEPTON-PROTON INTERACTIONS
DEEP INELASTIC SCATTERING
PROTONS
PARTON MODEL
STRUCTURE FUNCTIONS
ASYMMETRY
DISTRIBUTION FUNCTIONS
EMC EFFECT
GLUONS
HELICITY
ORBITAL ANGULAR MOMENTUM
POLARIZED TARGETS
QUARKS
SKYRME POTENTIAL
SPIN
SU-3 GROUPS
SUM RULES
ANGULAR MOMENTUM
BARYONS
COMPOSITE MODELS
ELEMENTARY PARTICLES
EQUATIONS
FERMIONS
FUNCTIONS
HADRONS
INELASTIC SCATTERING
INTERACTIONS
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
LIE GROUPS
MATHEMATICAL MODELS
NUCLEON-NUCLEON POTENTIAL
NUCLEONS
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PROPERTIES
POSTULATED PARTICLES
POTENTIALS
SCATTERING
SU GROUPS
SYMMETRY GROUPS
TARGETS
645203* - High Energy Physics- Particle Interactions & Properties-Theoretical- Weak Interactions & Properties
645204 - High Energy Physics- Particle Interactions & Properties-Theoretical- Strong Interactions & Properties