Measurements of the proton elastic-form-factor ratio mu pG p E/G p M at low momentum transfer.
Phys Rev Lett
; 99(20): 202002, 2007 Nov 16.
Article
em En
| MEDLINE
| ID: mdl-18233135
ABSTRACT
High-precision measurements of the proton elastic form-factor ratio, mu pG p E/G p M, have been made at four-momentum transfer, Q2, values between 0.2 and 0.5 GeV2. The new data, while consistent with previous results, clearly show a ratio less than unity and significant differences from the central values of several recent phenomenological fits. By combining the new form-factor ratio data with an existing cross-section measurement, one finds that in this Q2 range the deviation from unity is primarily due to G p E being smaller than expected.
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Tipo de estudo:
Qualitative_research
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En
Ano de publicação:
2007
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Article