A guide to light-cone PDFs from lattice QCD: an overview of approaches, techniques, and results
From MaRDI portal
(Redirected from Publication:2318431)
DOI10.1155/2019/3036904zbMATH Open1418.81003arXiv1811.07248OpenAlexW2901769511WikidataQ127780456 ScholiaQ127780456MaRDI QIDQ2318431
Author name not available (Why is that?)
Publication date: 15 August 2019
Published in: (Search for Journal in Brave)
Abstract: Within the theory of Quantum Chromodynamics (QCD), the rich structure of hadrons can be quantitatively characterized, among others, using a basis of universal non-perturbative functions: parton distribution functions (PDFs), generalized parton distributions (GPDs), transverse-momentum dependent distributions (TMDs) and distribution amplitudes (DAs). For more than half a century, there has been a joint experimental and theoretical effort to obtain these partonic functions. However, the complexity of the strong interactions has placed severe limitations, and first-principle results on the distributions was extracted mostly from their moments computed in Lattice QCD. Recently, breakthrough ideas changed the landscape and several approaches were proposed to access the distributions themselves on the lattice. In this paper, we review in considerable detail approaches directly related to partonic distributions. We highlight a recent idea proposed by X. Ji on extracting quasi-distributions that spawned renewed interest in the whole field and sparked the largest amount of numerical studies of Lattice QCD. We discuss theoretical and practical developments, including challenges that had to be overcome, with some yet to be handled. We also review numerical results, including a discussion based on evolving understanding of the underlying concepts and theoretical and practical progress. Particular attention is given to important aspects that validated the quasi-distribution approach, such as renormalization, matching to light-cone distributions and lattice techniques. In addition to a thorough discussion of quasi-distributions, we consider other approaches: hadronic tensor, auxiliary quark methods, pseudo-PDFs, OPE without OPE and good lattice cross sections. In closing, we provide prospects of the field, with emphasis on the necessary conditions to obtain results with controlled uncertainties.
Full work available at URL: https://arxiv.org/abs/1811.07248
No records found.
This page was built for publication: A guide to light-cone PDFs from lattice QCD: an overview of approaches, techniques, and results
Report a bug (only for logged in users!)Click here to report a bug for this page (MaRDI item Q2318431)
