1313010.1007/13130.1029-8479Journal of High Energy PhysicsJ. High Energ. Phys.1029-8479Springer Berlin HeidelbergBerlin/HeidelbergJHEP05(2020)067130041912.0954310.1007/JHEP05(2020)067Regular Article - Theoretical PhysicsSingle top production in PDF fitshttp://orcid.org/0000-0001-9886-4824NoceraEmanuele R.1aUbialiMaria2VoiseyCameron3grid.420012.50000 0004 0646 2193NikhefScience Park 105NL-1098 XGAmsterdamThe Netherlandsgrid.5335.00000000121885934DAMTPUniversity of CambridgeWilberforce RoadCB3 0WACambridgeUnited Kingdomgrid.5335.00000000121885934Cavendish Laboratory (HEP)JJ Thomson AvenueCB3 0HECambridgeUnited Kingdome.nocera@nikhef.nl145202052020202056714520202022020214202029420201452020© The Author(s) 20202020A<sc>bstract</sc>

We study the impact of recent LHC t-channel single top-quark and top-antiquark measurements at centre-of-mass energies of 7, 8 and 13 TeV on the parton distribution functions (PDFs) of the proton. We consider, namely, total cross sections, top-antitop cross section ratios, and differential distributions. We present a critical appraisal of the data, studying in particular how their description is affected by the theoretical details that enter the computation of the corresponding observables: QCD and electroweak higher-order corrections, the flavour scheme, and the value of the bottom-quark threshold. We perform a series of fits to the data within the NNPDF3.1 framework, whereby next-to-next-to-leading order QCD corrections are applied to single top measurements in a systematic way. We find that there exists an optimal combination of data that maximises consistency with the rest of the dataset, and efficiency in constraining the up, down and, partially, gluon PDFs.

K<sc>eywords</sc>QCD Phenomenologypublisher-imprint-nameSpringervolume-issue-count12issue-article-count161issue-toc-levels0issue-pricelist-year2020issue-copyright-holderThe Author(s)issue-copyright-year2020article-contains-esmNoarticle-numbering-styleContentOnlyarticle-registration-date-year2020article-registration-date-month5article-registration-date-day14article-toc-levels0toc-levels0volume-typeRegularjournal-productArchiveJournalnumbering-styleUnnumberedarticle-grants-typeOpenChoicemetadata-grantOpenAccessabstract-grantOpenAccessbodypdf-grantOpenAccessbodyhtml-grantOpenAccessbibliography-grantOpenAccessesm-grantOpenAccessonline-firstfalsepdf-file-referenceBodyRef/PDF/13130_2020_Article_13004.pdfpdf-typeTypesettarget-typeOnlinePDFissue-online-date-year2020issue-online-date-month8issue-online-date-day23issue-typeRegulararticle-typeOriginalPaperjournal-subject-primaryPhysicsjournal-subject-secondaryElementary Particles, Quantum Field Theoryjournal-subject-secondaryQuantum Field Theories, String Theoryjournal-subject-secondaryClassical and Quantum Gravitation, Relativity Theoryjournal-subject-secondaryQuantum Physicsjournal-subject-collectionPhysics and Astronomyopen-accesstrue

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