Generalized parton distributions through universal moment parameterization: non-zero skewness case
arXiv:2302.07279 · doi:10.1007/JHEP05(2023)150
Abstract
We present the first global analysis of generalized parton distributions (GPDs) combing lattice quantum chromodynamics (QCD) calculations and experiment measurements including global parton distribution functions (PDFs), form factors (FFs) and deeply virtual Compton scattering (DVCS) measurements. Following the previous work where we parameterize GPDs in terms of their moments, we extend the framework to allow for the global analysis at non-zero skewness. Together with the constraints at zero skewness, we fit GPDs to global DVCS measurements from both the recent JLab and the earlier Hadron-Electron Ring Accelerator (HERA) experiments with two active quark flavors and leading order QCD evolution. With certain choices of empirical constraints, both sea and valence quark distributions are extracted with the combined inputs, and we present the quark distributions in the proton correspondingly. We also discuss how to extend the framework to accommodate more off-forward constraints beyond the small expansion, especially the lattice calculated GPDs.
23 pages, 7 figures and 3 tables
References in corpus (6)
- Proton and neutron electromagnetic form factors and uncertainties
- Towards a fitting procedure for deeply virtual Compton scattering at next-to-leading order and beyond
- Nucleon Helicity Generalized Parton Distribution at Physical Pion Mass from Lattice QCD
- How well do we know the gluon polarization in the proton?
- Generalized parton distributions through universal moment parameterization: zero skewness case
- Dual parametrization of generalized parton distributions in two equivalent representations