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G{sub E{sub p}}/G{sub M{sub p}} ratio by polarization transfer in e --> p --> ep -->

Journal Article · · Physical Review Letters
OSTI ID:828185
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The ratio of the proton's elastic electromagnetic form factors, G{sub E{sub p}}/G{sub M{sub p}} was obtained by measuring P{sub i} and P{sub l}, the transverse and the longitudinal recoil proton polarization, respectively. For elastic ep to ep, G{sub E{sub p}}/G{sub M{sub p}} is proportional to P{sub t}/P{sub l}. Simultaneous measurement of P{sub t} and P{sub l} in a polarimeter provides good control of the systematic uncertainty. The results for the ratio G{sub E{sub p}}/G{sub M{sub p}} show a systematic decrease as Q{sup 2} increases from 0.5 to 3.5 GeV{sup 2}, indicating for the first time a definite difference in the spatial distribution of charge and magnetization currents in the proton.
Research Organization:
Thomas Jefferson National Accelerator Facility, Newport News, VA (US)
Sponsoring Organization:
USDOE Office of Energy Research (ER) (US)
DOE Contract Number:
AC05-84ER40150
OSTI ID:
828185
Report Number(s):
JLAB-PHY-00-71; DOE/ER/40150-2846; nucl-ex/9910005
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 7 Vol. 84; ISSN 0031-9007; ISSN PRLTAO
Country of Publication:
United States
Language:
English

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Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ELECTROMAGNETIC FORM FACTORS
MAGNETIZATION
POLARIMETERS
POLARIZATION
PROTONS
SPATIAL DISTRIBUTION