The Form Factors of the Nucleons: Present Status - Fisica

Nucleon Form Factors
Form factors have been obtained from
elastic electron scattering cross sections
from the very beginning of
R. Hofstadter’s pioneering work at
Stanford in the mid-1900s.
In early 70’s the data available suggested
that G Ep decreased faster than the dipole
form factor G D=(1+Q 2 /0.71) -2 (see figure).
The first experiment to show a strong
preference for G Ep/G D ~ 1 was that
of Litt et al. published in 1970, not
included in this figure.
Following experiments mostly confirmed
the Litt results (Walker et al. 1994,
Andivahis et al, 1994)) including two
experiments at Jlab (Christy et al 2004,
and Qattan et al. 2005).
2/17/2013 C.F. Perdrisat SAEMP Trento 2013
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