TY  - EJOUR
AU  - Lin, Huey-Wen
AU  - Nocera, Emanuele R.
AU  - Olness, Fred
AU  - Orginos, Kostas
AU  - Rojo, Juan
AU  - Accardi, Alberto
AU  - Alexandrou, Constantia
AU  - Bacchetta, Alessandro
AU  - Bozzi, Giuseppe
AU  - Chen, Jiunn-Wei
AU  - Collins, Sara
AU  - Cooper-Sarkar, Amanda
AU  - Constantinou, Martha
AU  - Del Debbio, Luigi
AU  - Engelhardt, Michael
AU  - Green, Jeremy
AU  - Gupta, Rajan
AU  - Harland-Lang, Lucian A.
AU  - Ishikawa, Tomomi
AU  - Kusina, Aleksander
AU  - Liu, Keh-Fei
AU  - Liuti, Simonetta
AU  - Monahan, Christopher
AU  - Nadolsky, Pavel
AU  - Qiu, Jian-Wei
AU  - Schienbein, Ingo
AU  - Schierholz, Gerrit
AU  - Thorne, Robert S.
AU  - Vogelsang, Werner
AU  - Wittig, Hartmut
AU  - Yuan, C.-P.
AU  - Zanotti, James
TI  - Parton distributions and lattice QCD calculations: a community white paper
IS  - DESY-17-185
M1  - PUBDB-2017-12339
M1  - DESY-17-185
M1  - IFJPAN-IV-2017-19
M1  - INT-PUB-17-042
M1  - MSUHEP-17-017
M1  - NIKHEF-2017-047
M1  - OUTP-17-15P
M1  - SMU-HEP-17-08
M1  - arXiv:1711.07916
PY  - 2017
N1  - 80 pages, 15 figures, 28 tables
AB  - 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.
LB  - PUB:(DE-HGF)25 ; PUB:(DE-HGF)29
DO  - DOI:10.3204/PUBDB-2017-12339
UR  - https://bib-pubdb1.desy.de/record/395855
ER  -