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dc.contributor.authorBall, Richard Den
dc.contributor.authorCarrazza, Stefanoen
dc.contributor.authorDebbio, Luigi Delen
dc.contributor.authorForte, Stefanoen
dc.contributor.authorKassabov, Zaharien
dc.contributor.authorRojo, Juanen
dc.contributor.authorSlade, Emmaen
dc.contributor.authorUbiali, Mariaen
dc.date.accessioned2018-06-29T12:00:43Z
dc.date.available2018-06-29T12:00:43Z
dc.date.issued2018-01en
dc.identifier.issn1434-6044
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/277658
dc.description.abstractWe present a determination of the strong coupling constant $\alpha_s(m_Z)$ based on the NNPDF3.1 determination of parton distributions, which for the first time includes constraints from jet production, top-quark pair differential distributions, and the $Z$ $p_T$ distributions using exact NNLO theory. Our result is based on a novel extension of the NNPDF methodology - the correlated replica method - which allows for a simultaneous determination of $\alpha_s$ and the PDFs with all correlations between them fully taken into account. We study in detail all relevant sources of experimental, methodological and theoretical uncertainty. At NNLO we find $\alpha_s(m_Z) = 0.1185 \pm 0.0005^\text{(exp)}\pm 0.0001^\text{(meth)}$, showing that methodological uncertainties are negligible. We conservatively estimate the theoretical uncertainty due to missing higher order QCD corrections (N$^3$LO and beyond) from half the shift between the NLO and NNLO $\alpha_s$ values, finding $\Delta\alpha^{\rm th}_s =0.0011$.
dc.format.mediumPrint-Electronicen
dc.languageengen
dc.publisherElsevier
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.titlePrecision determination of the strong coupling constant within a global PDF analysis: NNPDF Collaboration.en
dc.typeArticle
prism.issueIdentifier5en
prism.publicationDate2018en
prism.publicationNameThe European physical journal. C, Particles and fieldsen
prism.startingPage408
prism.volume78en
dc.identifier.doi10.17863/CAM.24994
dcterms.dateAccepted2018-05-14en
rioxxterms.versionofrecord10.1140/epjc/s10052-018-5897-7en
rioxxterms.versionVoR*
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2018-01en
dc.contributor.orcidForte, Stefano [0000-0002-5848-5907]
dc.contributor.orcidUbiali, Maria [0000-0001-7243-4439]
dc.identifier.eissn1434-6052
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idScience and Technology Facilities Council (ST/J000434/1)
pubs.funder-project-idRoyal Society (DH150088)
pubs.funder-project-idRoyal Society (RGF/EA/180148)
rioxxterms.freetoread.startdate2100-01-01


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Attribution 4.0 International
Except where otherwise noted, this item's licence is described as Attribution 4.0 International