arXiv:1001.2711v1 [hep-ph] 15 Jan 2010 CPHT-RR005.0110 The dual parametrization for gluon GPDs Kirill M. Semenov-Tian-Shansky CPhT, ´ Ecole Polytechnique, CNRS, 91128, Palaiseau, France and LPT, Universit´ e dOrsay, CNRS, 91404 Orsay, France and St. Petersburg State University, St.Petersburg, 198504, Petrodvoretz, Russia ∗ Abstract We consider the application of the dual parametrization for the case of gluon GPDs in the nucleon. This provides opportunities for the more flexible modeling unpolarized gluon GPDs in a nucleon which in particular contain the invaluable information on the fraction of nucleon spin carried by gluons. We perform the generalization of Abel transform tomography approach for the case of gluons. We also discuss the skewness effect in the framework of the dual parametrization. We strongly suggest to employ the fitting strategies based on the dual parametrization to extract the information on GPDs from the experimental data. PACS numbers: 13.60.Fz, 12.40.Nn, 11.55.Fv, ∗ Kirill.Semenov@cpht.polytechnique.fr 1