{"paper":{"title":"Parton distributions and lattice QCD calculations: a community white paper","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-lat"],"primary_cat":"hep-ph","authors_text":"Alberto Accardi, Aleksander Kusina, Alessandro Bacchetta, Amanda Cooper-Sarkar, Christopher Monahan, Constantia Alexandrou, C.-P. Yuan, Emanuele R. Nocera, Fred Olness, Gerrit Schierholz, Giuseppe Bozzi, Hartmut Wittig, Huey-Wen Lin, Ingo Schienbein, James Zanotti, Jeremy Green, Jian-Wei Qiu, Jiunn-Wei Chen, Juan Rojo (editors), Keh-Fei Liu, Kostas Orginos, Lucian A. Harland-Lang, Luigi Del Debbio, Martha Constantinou, Michael Engelhardt, Pavel Nadolsky, Rajan Gupta, Robert S. Thorne, Sara Collins, Simonetta Liuti, Tomomi Ishikawa, Werner Vogelsang","submitted_at":"2017-11-21T17:06:24Z","abstract_excerpt":"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 progr"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1711.07916","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}