On possible resolutions of the spin crisis in the parton model
The recent experimental data of the EMC group on deep inelastic scattering of polarized muons on polarized protons has led to serious doubt on the correctness of our understanding of how the total spin of the proton is built up from the spins of its parton constituents (the so-called spin crisis). Several attempts have been made to solve this problem. From our point of view none of these is satisfactory. Based on the Gerasimov-Drell-Hearn sum rule, we show that in the range of /ital Q//sup 2/ values characteristic for the EMC experiment there should be substantial corrections from higher twist terms. Taking these corrections into account gives the possibility to resolve the problem both in sign and in magnitude of the effect.
- Research Organization:
- Institute of Theoretical and Experimental Physics, State Atomic Energy Commission(SU)
- OSTI ID:
- 6064872
- Journal Information:
- Sov. J. Nucl. Phys. (Engl. Transl.); (United States), Vol. 49:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
MUON-PROTON INTERACTIONS
DEEP INELASTIC SCATTERING
PROTONS
SPIN
EMC EFFECT
PARTON MODEL
POLARIZED BEAMS
POLARIZED TARGETS
SUM RULES
ANGULAR MOMENTUM
BARYONS
BEAMS
COMPOSITE MODELS
ELEMENTARY PARTICLES
EQUATIONS
FERMIONS
HADRONS
INELASTIC SCATTERING
INTERACTIONS
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
MATHEMATICAL MODELS
MUON-NUCLEON INTERACTIONS
NUCLEONS
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PROPERTIES
SCATTERING
TARGETS
645300* - High Energy Physics- Particle Invariance Principles & Symmetries
645201 - High Energy Physics- Particle Interactions & Properties-Theoretical- General & Scattering Theory