Precision measurement of x,Q sup 2 and A-dependence of R =. sigma. sub L /. sigma. sub T and F sub 2 in deep inelastic scattering
The author reports on results for he quantities: the ratio R={sigma}{sub L}/{sigma}{sub T} of the longitudinal ({sigma}{sub L}) and transverse ({sigma}{sub T}) virtual photon absorption cross section, the structure function F{sub 2}, the difference R{sup A}-R{sup D}, and the cross section ratio {sigma}{sup A}/{sigma}{sup D}, measured in deep inelastic electron scattering from targets of deuterium, iron and gold. The results for R obtained at x=0.2, 0.35 and 0.5 show a clear fall off with increasing Q{sup 2}, in the range of 1 {le} Q{sup 2} {le} 10 GeV{sup 2}. The x and Q{sup 2} dependence of the quantity R, and the scaling behavior of F{sub 2} are inconsistent with the naive parton model, and the perturbative Quantum Chromodynamics predictions. However, when the effects due to target mass a la Georgi and Politzer are included with the QCD predictions the results are in good agreement. The possible spin-O diquark content of the nucleons, and any large effects from higher twist terms, beyond those from kinematic target mass effects, are therefore not required to explain the data. The results on the differences R{sup A}-R{sup D} are consistent with zero, and are in agreement with the models for the EMC effect, including those based on Quantum Chromodynamics, which predict negligible difference. These results indicate that there are no significant spin-0 constituents or higher twist effects in nuclei as compared to free nucleons. The EMC effect is confirmed with very small errors and all data (electron and muon scattering) are now in agreement. The results indicate that this effect is due to a non-trivial difference in the quark distributions between heavy nuclei and the deuteron.
- Research Organization:
- Rochester Univ., NY (USA)
- OSTI ID:
- 5828373
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
DEEP INELASTIC SCATTERING
EXPERIMENTAL DATA
CROSS SECTIONS
DEUTERIUM
EMC EFFECT
GOLD
IRON
LEPTON-NUCLEON INTERACTIONS
MASS
PARTON MODEL
PERTURBATION THEORY
PHOTONS
QUANTUM CHROMODYNAMICS
STRUCTURE FUNCTIONS
VIRTUAL PARTICLES
COMPOSITE MODELS
DATA
ELEMENTARY PARTICLES
ELEMENTS
FIELD THEORIES
FUNCTIONS
HYDROGEN ISOTOPES
INELASTIC SCATTERING
INFORMATION
INTERACTIONS
ISOTOPES
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LIGHT NUCLEI
MASSLESS PARTICLES
MATHEMATICAL MODELS
METALS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
PARTICLE INTERACTIONS
PARTICLE MODELS
QUANTUM FIELD THEORY
SCATTERING
STABLE ISOTOPES
TRANSITION ELEMENTS
645101* - High Energy Physics- Particle Interactions & Properties-Experimental- Electromagnetic Interactions & Properties