Proton Elastic Form Factor Ratio by Recoil Polarization to a Q^2 of 5.6 GeV^2

Details Proton Elastic Form Factor Ratio by Recoil Polarization to a Q^2 of 5.6 GeV^2 Proton Elastic Form Factor Ratio by Recoil Polarization to a Q^2 of 5.6 GeV^2

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apr.k4003p&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

Polarization experiments have been important in the study of hadronic physics in the last 30 years. The sensitivity of spin observables to small amplitudes provides a powerful tool in constraining both reaction mechanism and nuclear structure models. The measurement of polarization observables offers new possibilities to determine some of the smaller amplitudes and interference terms. This technique has been used at Jefferson Lab to measure nucleon form factors as well as structure functions in A(e,e' p) and A(e,e'p) reactions. An initial measurement of the proton form factor ratio G_Ep/G_Mp was made in 1998 in Hall A at JLab to Q^2=3.5 GeV^2(M.K. Jones et al. al.), Phys. Rev. Lett. 84, 1398 (2000). with unprecedented accuracy. The results demonstrated unambiguously for the first time that the Q^2 dependencies of G_Ep and G_Mp are different from one another. The ratio μ G_Ep/G_Mp was found to decrease linearly with Q^2, down to 0.6 at Q^2=3.5 GeV^2; in the dipole model this ratio would be 1.0 for all Q^2 values. In 2000 a second measurement of this ratio to Q^2=5.6 GeV^2,(O. Gayou et al. al.), to be published in Phys. Rev. Lett.,(2002). with similar accuracy, showed that it decreased further to 0.28 at Q^2 of 5.6 GeV^2. In the non-relativistic limit, this indicates that the spatial distributions of charge and magnetization current densities in the proton are different. These two experiments contribute to the characterization of the structure of the nucleon, which is of fundamental importance to nuclear and particle physics. In fact, precise knowledge of charge and current distributions inside the nucleon is a prerequisite for the test of any theory of strong interaction based on QCD.

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