# Generalized parton correlation functions for a spin-0 hadron

**Authors:** S. Meissner, A. Metz, M. Schlegel, K. Goeke  
**arXiv:** [0805.3165](https://arxiv.org/abs/0805.3165)  
**Date:** 2008-05-20  
**Summary page:** https://www.summarizepaper.com/fr/paper/0805.3165v2/

## Abstract

The fully unintegrated, off-diagonal quark-quark correlator for a spin-0 hadron is parameterized in terms of so-called generalized parton correlation functions. Such objects are of relevance for the phenomenology of certain hard exclusive reactions. In particular, they can be considered as {\it mother distributions} of generalized parton distributions on the one hand and transverse momentum dependent parton distributions on the other. Therefore, our study provides new, model-independent insights into the recently proposed nontrivial relations between generalized and transverse momentum dependent parton distributions. As a by-product we obtain the first complete classification of generalized parton distributions beyond leading twist.