Speaker
Kirill Semenov-Tian-Shansky
(CPHT Ecole Polytechnique)
Description
The dual parametrization of generalized parton distributions (GPDs) and
the Mellin-Barnes integral approach represent two frameworks for
handling the double partial wave expansion of GPDs in the conformal
partial waves and in the cross-channel SO(3) partial waves. We explicitly
show the complete equivalence of these two independently developed
GPD representations. This provides additional insight into the GPD
properties and their physical interpretation. We discuss the relation
between the J=0 fixed pole contribution into the Compton scattering
amplitude and the D-term form factor. We argue that in the Bjorken
limit the J=0 fixed pole universality hypothesis of S. Brodsky, F. Llanes-Estrada and
A. Szczepaniak is equivalent to the conjecture that the D-term form factor is given by the
inverse moment sum rule. We also briefly discuss applications for GPD
modeling and map the phenomenologically successful Kumericki-Mueller
GPD model to the dual parametrization framework.
Author
Kirill Semenov-Tian-Shansky
(CPHT Ecole Polytechnique)
Co-authors
Dieter Mueller
(R)
Maxim Polyakov
(TP2 Ruhr University Bochum)
