2018/08/31 by Shohini Bhattacharya, Christopher Cocuzza, Andreas Metz · 1 citation
Physics and Astronomy · #Diquark #Factorization #Hadron #High-Energy Particle Collisions Research #Momentum (technical analysis) #Particle physics #Particle physics theoretical and experimental studies #Parton #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Scalar (mathematics) #Statistical physics #hep-lat #hep-ph
paper · pdf · doi:10.1016/j.physletb.2018.09.061
14 pages; version to be published in PLB
arxiv created 2018/09/25 · openalex publication_date 2018/11/28 · arxiv updated 2018/12/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
Recently the concept of quasi parton distributions (quasi-PDFs) for hadrons has been proposed. Quasi-PDFs are defined through spatial correlation functions and as such can be computed numerically using quantum chromodynamics on a four-dimensional lattice. As the hadron momentum is increased, the quasi-PDFs converge to the corresponding standard PDFs that appear in factorization theorems for many high-energy scattering processes. Here we investigate this new concept in the case of generalized parton distributions (GPDs) by calculating the twist-2 vector GPDs in the scalar diquark spectator model. For infinite hadron momentum, the analytical results of the quasi-GPDs agree with those of the standard GPDs. Our main focus is to examine how well the quasi-GPDs agree with the standard GPDs for finite hadron momenta. We also study the sensitivity of the results on the parameters of the model. In general, our model calculation suggests that quasi-GPDs could be a viable tool for getting information about standard GPDs.