Flavor decomposition of the elastic nucleon electromagnetic form factors

The u- and d-quark contributions to the elastic nucleon electromagnetic form factors have been determined by using experimental data on G(E)(n), G(M)(n), G(E)(p), and G(M)(p). Such a flavor separation of the form factors became possible up to negative four-momentum transfer squared Q(2) = 3.4 GeV(2)...

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Bibliographic Details
Published in:Physical review letters 2011-06, Vol.106 (25), p.252003-252003, Article 252003
Main Authors: Cates, G D, de Jager, C W, Riordan, S, Wojtsekhowski, B
Format: Article
Language:English
Subjects:
DIRAC FORM FACTORS
ELECTROMAGNETIC FORM FACTORS
FORM FACTORS
NUCLEONS
PAULI FORM FACTORS
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
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Summary:The u- and d-quark contributions to the elastic nucleon electromagnetic form factors have been determined by using experimental data on G(E)(n), G(M)(n), G(E)(p), and G(M)(p). Such a flavor separation of the form factors became possible up to negative four-momentum transfer squared Q(2) = 3.4 GeV(2) with recent data on G(E)(n) from Hall A at Jefferson Lab. For Q(2) above 1 GeV(2), for both the u and the d quark, the ratio of the Pauli and Dirac form factors, F(2)/F(1), was found to be almost constant in sharp contrast to the behavior of F(2)/F(1) for the proton as a whole. Also, again for Q(2)>1 GeV(2), both F(2)(d) and F(1)(d) are roughly proportional to 1/Q(4), whereas the dropoff of F(2)(u) and F(1)(u) is more gradual.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.106.252003