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

Journal Article · Sun Jan 01 04:00:00 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), Journal Name: Phys. Rev. D; (United States) Vol. 39:1; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

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