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The European Physical Journal C

, Volume 63, Issue 3, pp 407–421 | Cite as

Generalized parton distributions from hadronic observables: non-zero skewness

  • Saeed Ahmad
  • Heli Honkanen
  • Simonetta LiutiEmail author
  • Swadhin K. Taneja
Regular Article - Theoretical Physics

Abstract

We propose a physically motivated parameterization for the unpolarized generalized parton distributions, H and E, valid at both zero and non-zero values of the skewness variable, ζ. Our approach follows a previous detailed study of the ζ=0 case where H and E were determined using constraints from simultaneous fits of the experimental data on both the nucleon elastic form factors and the deep inelastic structure functions in the non-singlet sector. Additional constraints at ζ≠0 are provided by lattice calculations of the higher moments of generalized parton distributions. We illustrate a method for extracting generalized parton distributions from lattice moments based on a reconstruction using sets of orthogonal polynomials. The inclusion in our fit of data on Deeply Virtual Compton Scattering is also discussed. Our method provides a step towards an extraction of generalized distributions based on a global fit of the available data within the given set of constraints.

PACS

13.60.Hb 13.40.Gp 24.85.+p 

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Copyright information

© Springer-Verlag / Società Italiana di Fisica 2009

Authors and Affiliations

  • Saeed Ahmad
    • 1
  • Heli Honkanen
    • 1
  • Simonetta Liuti
    • 1
    Email author
  • Swadhin K. Taneja
    • 2
  1. 1.University of VirginiaCharlottesvilleUSA
  2. 2.Ecole Polytechnique, CPHTPalaiseau CedexFrance

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