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Phys. Rev. D 72, 054013 (2005) [12 pages]

Nucleon form factors from generalized parton distributions

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M. Guidal1, M. V. Polyakov2,3, A. V. Radyushkin4,5,6, and M. Vanderhaeghen5,7
1Institut de Physique Nucléaire Orsay, F-91406 Orsay, France
2Petersburg Nuclear Physics Institute, Gatchina, St. Petersburg 188300, Russia
3Université de Liège au Sart Tilman, B-4000 Liège 1 Belgium
4Physics Department, Old Dominion University, Norfolk, Virginia 23529, USA
5Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
6Joint Institute for Nuclear Research, 141980 Dubna, Russia
7Physics Department, College of William and Mary, Williamsburg, Virginia 23187, USA

Received 20 October 2004; revised 11 July 2005; published 20 September 2005

We discuss the links between generalized parton distributions (GPDs) and elastic nucleon form factors. These links, in the form of sum rules, represent powerful constraints on parametrizations of GPDs. A Regge parametrization for GPDs at small momentum transfer, is extended to the large momentum transfer region and it is found to describe the basic features of proton and neutron electromagnetic form factor data. This parametrization is used to estimate the quark contribution to the nucleon spin.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.72.054013
DOI:
10.1103/PhysRevD.72.054013
PACS:
12.38.Bx, 13.60.Fz, 13.60.Hb, 13.60.Le
 
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