Parton distributions from high-precision collider data

We present a new set of parton distributions, NNPDF3.1, which updates NNPDF3.0, the first global set of PDFs determined using a methodology validated by a closure test. The update is motivated by recent progress in methodology and available data, and involves both. On the methodological side, we now...

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Asıl Yazarlar: Collaboration, TNNPDF, Ball, R, Bertone, V, Carrazza, S, Debbio, L, Forte, S, Groth-Merrild, P, Guffanti, A, Hartland, N, Kassabov, Z, Latorre, J, Nocera, E, Rojo, J, Rottoli, L, Slade, E, Ubiali, M
Materyal Türü: Journal article
Baskı/Yayın Bilgisi: Springer Verlag 2017
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author Collaboration, TNNPDF
Ball, R
Bertone, V
Carrazza, S
Debbio, L
Forte, S
Groth-Merrild, P
Guffanti, A
Hartland, N
Kassabov, Z
Latorre, J
Nocera, E
Rojo, J
Rottoli, L
Slade, E
Ubiali, M
author_facet Collaboration, TNNPDF
Ball, R
Bertone, V
Carrazza, S
Debbio, L
Forte, S
Groth-Merrild, P
Guffanti, A
Hartland, N
Kassabov, Z
Latorre, J
Nocera, E
Rojo, J
Rottoli, L
Slade, E
Ubiali, M
author_sort Collaboration, TNNPDF
collection OXFORD
description We present a new set of parton distributions, NNPDF3.1, which updates NNPDF3.0, the first global set of PDFs determined using a methodology validated by a closure test. The update is motivated by recent progress in methodology and available data, and involves both. On the methodological side, we now parametrize and determine the charm PDF alongside the light-quark and gluon ones, thereby increasing from seven to eight the number of independent PDFs. On the data side, we now include the D0 electron and muon W asymmetries from the final Tevatron dataset, the complete LHCb measurements of W and Z production in the forward region at 7 and 8 TeV, and new ATLAS and CMS measurements of inclusive jet and electroweak boson production. We also include for the first time top-quark pair differential distributions and the transverse momentum of the Z bosons from ATLAS and CMS. We investigate the impact of parametrizing charm and provide evidence that the accuracy and stability of the PDFs are thereby improved. We study the impact of the new data by producing a variety of determinations based on reduced datasets. We find that both improvements have a significant impact on the PDFs, with some substantial reductions in uncertainties, but with the new PDFs generally in agreement with the previous set at the one-sigma level. The most significant changes are seen in the light-quark flavor separation, and in increased precision in the determination of the gluon. We explore the implications of NNPDF3.1 for LHC phenomenology at Run II, compare with recent LHC measurements at 13 TeV, provide updated predictions for Higgs production cross-sections and discuss the strangeness and charm content of the proton in light of our improved dataset and methodology. The NNPDF3.1 PDFs are delivered for the first time both as Hessian sets, and as optimized Monte Carlo sets with a compressed number of replicas.
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spelling oxford-uuid:d359929e-6e39-4a00-96d5-088d4019ed5d2022-03-27T08:10:38ZParton distributions from high-precision collider dataJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:d359929e-6e39-4a00-96d5-088d4019ed5dSymplectic Elements at OxfordSpringer Verlag2017Collaboration, TNNPDFBall, RBertone, VCarrazza, SDebbio, LForte, SGroth-Merrild, PGuffanti, AHartland, NKassabov, ZLatorre, JNocera, ERojo, JRottoli, LSlade, EUbiali, MWe present a new set of parton distributions, NNPDF3.1, which updates NNPDF3.0, the first global set of PDFs determined using a methodology validated by a closure test. The update is motivated by recent progress in methodology and available data, and involves both. On the methodological side, we now parametrize and determine the charm PDF alongside the light-quark and gluon ones, thereby increasing from seven to eight the number of independent PDFs. On the data side, we now include the D0 electron and muon W asymmetries from the final Tevatron dataset, the complete LHCb measurements of W and Z production in the forward region at 7 and 8 TeV, and new ATLAS and CMS measurements of inclusive jet and electroweak boson production. We also include for the first time top-quark pair differential distributions and the transverse momentum of the Z bosons from ATLAS and CMS. We investigate the impact of parametrizing charm and provide evidence that the accuracy and stability of the PDFs are thereby improved. We study the impact of the new data by producing a variety of determinations based on reduced datasets. We find that both improvements have a significant impact on the PDFs, with some substantial reductions in uncertainties, but with the new PDFs generally in agreement with the previous set at the one-sigma level. The most significant changes are seen in the light-quark flavor separation, and in increased precision in the determination of the gluon. We explore the implications of NNPDF3.1 for LHC phenomenology at Run II, compare with recent LHC measurements at 13 TeV, provide updated predictions for Higgs production cross-sections and discuss the strangeness and charm content of the proton in light of our improved dataset and methodology. The NNPDF3.1 PDFs are delivered for the first time both as Hessian sets, and as optimized Monte Carlo sets with a compressed number of replicas.
spellingShingle Collaboration, TNNPDF
Ball, R
Bertone, V
Carrazza, S
Debbio, L
Forte, S
Groth-Merrild, P
Guffanti, A
Hartland, N
Kassabov, Z
Latorre, J
Nocera, E
Rojo, J
Rottoli, L
Slade, E
Ubiali, M
Parton distributions from high-precision collider data
title Parton distributions from high-precision collider data
title_full Parton distributions from high-precision collider data
title_fullStr Parton distributions from high-precision collider data
title_full_unstemmed Parton distributions from high-precision collider data
title_short Parton distributions from high-precision collider data
title_sort parton distributions from high precision collider data
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