30 research outputs found
The Dirac form factor predicts the Pauli form factor in the Endpoint Model
We compute the momentum-transfer dependence of the proton Pauli form factor
in the endpoint overlap model. We find the model correctly reproduces
the scaling of the ratio of with the Dirac Form factor observed
at the Jefferson Laboratory. The calculation uses the leading-power, leading
twist Dirac structure of the quark light-cone wave function, and the same
endpoint dependence previously determined from the Dirac form factor .
There are no parameters and no adjustable functions in the endpoint model's
prediction for . The model's predicted ratio
is quite insensitive to the endpoint wave function, which explains why the
observed ratio scales like down to rather low momentum transfers. The
endpoint model appears to be the only comprehensive model consistent with all
form factor information as well as reproducing fixed-angle proton-proton
scattering at large momentum transfer. Any one of the processes is capable of
predicting the others.Comment: 12 pages, 3 figure