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Generalized parton distributions from hadronic observables: non-zero skewness
- Source :
- The European Physical Journal C. 63:407-421
- Publication Year :
- 2009
- Publisher :
- Springer Science and Business Media LLC, 2009.
-
Abstract
- We propose a physically motivated parametrization for the unpolarized generalized parton distributions, H and E, valid at both zero and non-zero values of the skewness variable, \zeta. Our approach follows a previous detailed study of the \zeta=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 \zeta \neq 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 a model independent extraction of generalized distributions from the data. It also provides an alternative to double distributions based phenomenological models in that we are able to satisfy the polynomiality condition by construction, using a combination of experimental data and lattice, without resorting to any specific mathematical construct.<br />Comment: 29 pages, 8 figures; added references, changed text in several places
- Subjects :
- Quantum chromodynamics
Physics
Particle physics
Physics and Astronomy (miscellaneous)
Lattice field theory
Compton scattering
FOS: Physical sciences
Parton
Observable
Deep inelastic scattering
High Energy Physics - Phenomenology
High Energy Physics - Phenomenology (hep-ph)
Skewness
Orthogonal polynomials
Statistical physics
Engineering (miscellaneous)
Subjects
Details
- ISSN :
- 14346052 and 14346044
- Volume :
- 63
- Database :
- OpenAIRE
- Journal :
- The European Physical Journal C
- Accession number :
- edsair.doi.dedup.....9ea95e6e0d51c06affe10e7396d05be9