Measurements of elastic electron scattering from the proton at high momentum transfer

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1987

OSTI ID:5858942

Sill, A F

Absolute measurements of the differential cross section for elastic electron-proton scattering were made in the range of momentum transfer from Q/sup 2/ = 2.9 to 31.3 (GeV/c)/sup 2/ using an electron beam at the Stanford Linear Accelerator Center. The data span six orders of magnitude in cross section. Combined statistical and systematic uncertainties in the cross section measurements ranged from 3% at low Q/sup 2/ to 19% at high Q/sup 2/. These data have been used to extract values of either the proton magnetic form factor G/sub M//sup rho/(Q/sup 2/) or Dirac form factor F/sub 1//sup rho/(Q/sup 2/) under the assumption that the electric form factor G/sub E//sup rho/(Q/sup 2/) follows the scaling relation G/sub E//sup rho/(Q/sup 2/) = G/sub M//sup rho/(Q/sup 2/)/..mu../sub rho/. The results at high momentum transfer are in rough agreement with the logarithmic falloff of Q/sup 4/F/sub 1//sup rho/ expected from leading twist predictions of perturbative quantum chromodynamics (QCD). An improved treatment is given for evaluating the argument of the running strong coupling constant ..-->../sub s/(Q/sup 2/) in each QCD diagram, resulting in improved agreement of the leading twist predictions with the data at high Q/sub 2/.

• Research Organization: American Univ., Washington, DC
• OSTI ID: 5858942
• Country of Publication: United States
• Language: English

Related Subjects

645101* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Electromagnetic Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
BARYONS
COUPLING CONSTANTS
CROSS SECTIONS
DATA
ELASTIC SCATTERING
ELECTRON-NUCLEON INTERACTIONS
ELECTRON-PROTON INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
EXPERIMENTAL DATA
FERMIONS
FIELD THEORIES
FORM FACTORS
GEV RANGE
GEV RANGE 10-100
HADRONS
INFORMATION
INTERACTIONS
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
LINEAR ACCELERATORS
LINEAR MOMENTUM TRANSFER
MOMENTUM TRANSFER
NUCLEONS
NUMERICAL DATA
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
PROTONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
SCALING LAWS
SCATTERING
STANFORD 20-GEV LINAC