1. Parton distributions and lattice-QCD calculations: Toward 3D structure
- Author
-
Marco Radici, T. J. Hobbs, C.-P. Yuan, Emanuele R. Nocera, Juan Rojo, Aurore Courtoy, Simonetta Liuti, Tie-Jiun Hou, Rui Zhang, Huey-Wen Lin, Martha Constantinou, Fred Olness, Jian Liang, Keh-Fei Liu, Anatoly Radyushkin, Pavel Nadolsky, Abha Rajan, Cédric Mezrag, Tommaso Giani, Jian-Hui Zhang, Krzysztof Kutak, Markus A. Ebert, Ted C. Rogers, Jian-Wei Qiu, Gerrit Schierholz, Aleksander Kusina, Michael Engelhardt, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay
- Subjects
perturbation theory [quantum chromodynamics] ,Nuclear and High Energy Physics ,Particle physics ,generalized parton distribution ,High Energy Physics::Lattice ,Lattice field theory ,Strong interaction ,FOS: Physical sciences ,parton: distribution function ,collinear ,Context (language use) ,Parton ,Lattice QCD ,model: parton ,transverse momentum dependence ,01 natural sciences ,High Energy Physics - Phenomenology (hep-ph) ,High Energy Physics - Lattice ,Factorization ,0103 physical sciences ,quantum chromodynamics: factorization ,Transverse Momentum Dependent PDFs (TMD PDFs) ,quantum chromodynamics: perturbation theory ,010306 general physics ,Nuclear Experiment ,Global QCD fits ,Physics ,Quantum chromodynamics ,factorization [quantum chromodynamics] ,010308 nuclear & particles physics ,[PHYS.HLAT]Physics [physics]/High Energy Physics - Lattice [hep-lat] ,High Energy Physics - Lattice (hep-lat) ,High Energy Physics::Phenomenology ,lattice field theory ,Perturbative QCD ,parton [model] ,Unpolarized/polarized parton distribution functions (PDFs) ,Generalized Parton Distributions (GPD) ,High Energy Physics - Phenomenology ,[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] ,High Energy Physics::Experiment ,hadron ,distribution function [parton] - Abstract
The strong force which binds hadrons is described by the theory of Quantum Chromodynamics (QCD). Determining the character and manifestations of QCD is one of the most important and challenging outstanding issues necessary for a comprehensive understanding of the structure of hadrons. Within the context of the QCD parton picture, the Parton Distribution Functions (PDFs) have been remarkably successful in describing a wide variety of processes. However, these PDFs have generally been confined to the description of collinear partons within the hadron. New experiments and facilities provide the opportunity to additionally explore the transverse structure of hadrons which is described by Generalized Parton Distributions (GPDs) and Transverse Momentum Dependent Parton Distribution Functions (TMD PDFs). In our previous review, we compared and contrasted the two main approaches used to determine the collinear PDFs: the first based on perturbative QCD factorization theorems, and the second based on lattice QCD calculations. In the present report, we provide an update of recent progress on the collinear PDFs, and also expand the scope to encompass the generalized PDFs (GPDs and TMD PDFs). We review the current state of the various calculations, and consider what new data might be available in the near future. We also examine how a shared effort can foster dialog between the PDF and Lattice QCD communities, and yield improvements for these generalized PDFs., 2020 PDFLattice Report, 64 pages, 34 figures
- Published
- 2021