Lin, HW;
Nocera, ER;
Olness, F;
Orginos, K;
Rojo, J;
Accardi, A;
Alexandrou, C;
... Zanotti, J; + view all
(2018)
Parton distributions and lattice QCD calculations: A community white paper.
Progress in Particle and Nuclear Physics
, 100
pp. 107-160.
10.1016/j.ppnp.2018.01.007.
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Abstract
In the framework of quantum chromodynamics (QCD), parton distribution functions (PDFs) quantify how the momentum and spin of a hadron are divided among its quark and gluon constituents. Two main approaches exist to determine PDFs. The first approach, based on QCD factorization theorems, realizes a QCD analysis of a suitable set of hard-scattering measurements, often using a variety of hadronic observables. The second approach, based on first-principle operator definitions of PDFs, uses lattice QCD to compute directly some PDF-related quantities, such as their moments. Motivated by recent progress in both approaches, in this document we present an overview of lattice-QCD and global-analysis techniques used to determine unpolarized and polarized proton PDFs and their moments. We provide benchmark numbers to validate present and future lattice-QCD calculations and we illustrate how they could be used to reduce the PDF uncertainties in current unpolarized and polarized global analyses. This document represents a first step towards establishing a common language between the two communities, to foster dialogue and to further improve our knowledge of PDFs.
| Type: | Article |
|---|---|
| Title: | Parton distributions and lattice QCD calculations: A community white paper |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.ppnp.2018.01.007 |
| Publisher version: | https://doi.org/10.1016/j.ppnp.2018.01.007 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Lattice QCD, Global QCD fits, Unpolarized/polarized parton distribution functions (PDFs) |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10044860 |
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