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arXiv · 1403.0803

Crossed channel analysis of quark and gluon generalized parton distributions with helicity flip

B. Pire·K. Semenov-Tian-Shansky·L. Szymanowski·S. Wallon
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Abstract

Quark and gluon helicity flip generalized parton distributions (GPDs) address the transversity quark and gluon structure of the nucleon. In order to construct a theoretically consistent parametrization of these hadronic matrix elements, we work out the set of combinations of those GPDs suitable for the ${\rm SO}(3)$ partial wave (PW) expansion in the cross-channel. This universal result will help to build up a flexible parametrization of these important hadronic non-perturbative quantities, using for instance the approaches based on the conformal PW expansion of GPDs such as the Mellin-Barnes integral or the dual parametrization techniques.

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B. Pire, K. Semenov-Tian-Shansky, L. Szymanowski, S. Wallon. 2014-03-04. Crossed channel analysis of quark and gluon generalized parton distributions with helicity flip. https://doi.org/10.1140/epja/i2014-14090-1

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