DOI 10.1007/s100529901100
Linking parton distributions to form factors and Compton scattering
M. Diehl1 - Th. Feldmann2 - R. Jakob3 - P. Kroll2
1 Deutsches Elektronen-Synchroton DESY, D-22603 Hamburg, Germany
2 Fachbereich Physik, Universität Wuppertal, D-42097 Wuppertal,
Germany
3 Università di Pavia and INFN, Sezione di Pavia,
I-27100 Pavia, Italy
Received: 12 November 1998 / Published online: 1 March 1999
Abstract
We relate ordinary and skewed parton
distributions to soft overlap contributions to elastic form factors
and large angle Compton scattering, using light-cone wave functions
in a Fock state expansion of the nucleon. With a simple ansatz for
the wave functions of the three lowest Fock states we achieve a good
description of unpolarised and polarised parton distributions at
large x, and of the data for the Dirac form factor and for Compton
scattering, both of which can be saturated with soft contributions
only. Large angle Compton scattering appears as a good case to
investigate the relative importance of soft and hard contributions
in exclusive processes which are sensitive to the end point regions
of the nucleon wave function.
Copyright Springer-Verlag
