Test of two new parametrizations of the generalized parton distributionH

Abstract

In 2011 Radyushkin outlined the practical implementation of the one-component double distribution formalism in realistic generalized parton distribution models. We compare the one-component double distribution framework to the standard one and compute deeply virtual Compton scattering observables for both. In particular, the new implementation is more flexible, offering a greater range of variation of the real and imaginary parts of the associated Compton form factor while still allowing the recovery of results similar to the classical approach. Moreover, the polynomiality property is satisfied up to the highest order. Although the comparison to experimental data may be improved, the one-component double distribution modeling is thus an attractive alternative.

GPD phenomenology and DVCS fitting

“…DDs in the Polyakov-Weiss gauge, mentioned in sec. 1.4.3, have been used continuously, apart from some recent attempts [113,114,115,116,117,132]. The general idea is exposed below with the example of the GPD H in the quark sector…”

“…[70] and was recently used for model building and theoretical considerations [113,114,115,116,117]. The relation (57) between the GPD H q and the 1CDD f q now is:…”

Untitled

“…Consequently, by means of the Radon-transform representation, non-trivial connection between N -and N +2-body wave functions have to emerge from the fundamental symmetries of the physical world. Indeed, one can take advantage of the usually called one-component DD (1CDD) or, specifically, BMKS scheme [4] (see also discussion in [29] and references therein), and the GPD can be expressed as the Radon transform, Rf , of the distribution f (β, α, t),…”

PARTONS: PARtonic Tomography Of Nucleon Software

“…The GK model [97][98][99], the VGG model [7,66,100,101], and the GPD models used in the papers by Vinnikov [104], Moutarde et al [63] and Mezrag et al [105]. Evolution…”