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Measurements of the electric and magnetic form factors of the proton from Q sup 2 =1. 75 to 8. 83 (GeV/ c ) sup 2

Journal Article · · Physical Review Letters; (United States)
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  1. The American University; Washington; D.C. 20016 (United States) University of California; Davis; California 95616 (United States) Continuous Electron Beam Acceleratorr Facility; Newport News; Virginia 23606 (United States) Lawrence Livermore National Laboratory; Livermore; California 94550 (United States) University of Maryland; College Park; Maryland 20742 (United States) University of Massachusetts; Amherst; Massachusetts 01003 (United States) National Institute of Standards and Technology; Gaithersburg; Maryland 20899 (United States) University of Pennsylvania; Philadelphia; Pennsylvania 19104 (United States) Universi
+ Show Author Affiliations

The proton elastic electric and magnetic form factors, {ital G}{sub {ital E}{ital p}}({ital Q}{sup 2}) and {ital G}{sub {ital M}{ital p}}({ital Q}{sup 2}), have been separately measured in the range {ital Q}{sup 2}=1.75 to 8.83 (GeV/{ital c}){sup 2}, more than doubling the {ital Q}{sup 2} range of previous data. Scaled by the dipole fit, {ital G}{sub {ital D}}({ital Q}{sup 2}), the results for {ital G}{sub {ital M}{ital p}}({ital Q}{sup 2})/{mu}{sub {ital p}G{ital D}}({ital Q}{sup 2}) decrease smoothly from 1.05 to 0.91, while {ital G}{sub {ital E}{ital p}}({ital Q}{sup 2})/{ital G}{sub {ital D}}({ital Q}{sup 2}) is consistent with unity. Comparisons are made to QCD sum rule, diquark, constitutent quark, and vector meson dominance models, none of which agree with all of the new data. The ratio {ital Q}{sup 2}{ital F}{sub 2}/{ital F}{sub 1} approaches a constant value for {ital Q}{sup 2}{gt}3 (GeV/{ital c}){sup 2}.

DOE Contract Number:
AC03-76SF00515; W-7405-ENG-48; FG02-88ER40415; AC02-76ER13065; FG06-90ER40537
OSTI ID:
7035375
Journal Information:
Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 68:26; ISSN PRLTA; ISSN 0031-9007
Country of Publication:
United States
Language:
English

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Related Subjects

662330 -- Photon & Charged-Lepton Interactions with Hadrons-- (1992)
662410* -- Properties of Baryons & Baryon Resonances-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
COMPOSITE MODELS
CROSS SECTIONS
DATA
DIFFERENTIAL CROSS SECTIONS
ELECTRON-NUCLEON INTERACTIONS
ELECTRON-PROTON INTERACTIONS
ELEMENTARY PARTICLES
EQUATIONS
EXPERIMENTAL DATA
FERMIONS
FIELD THEORIES
FORM FACTORS
HADRONS
INFORMATION
INTERACTIONS
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
MATHEMATICAL MODELS
NUCLEONS
NUMERICAL DATA
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PROPERTIES
PROTONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARK MODEL
SUM RULES
VECTOR DOMINANCE MODEL