Parton distributions from high-precision collider data

Richard D. Ball, Valerio Bertone, Stefano Carrazza, Luigi Del Debbio, Stefano Forte, Patrick Groth Merrild, Alberto Guffanti, Nathan P. Hartland, Zahari Kassabov, José I. Latorre, Emanuele R. Nocera, Juan Rojo, Luca Rottoli, Emma Slade, Maria Ubiali, The NNPDF Collaboration

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

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 quarks 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.
Original languageEnglish
Article number663
Number of pages75
JournalEuropean Journal of Physics C
Volume2017
Issue number77
DOIs
Publication statusPublished - 1 Jun 2017

Fingerprint

Colliding beam accelerators
partons
Bosons
quarks
methodology
Flavors
bosons
Momentum
Protons
strangeness
replicas
phenomenology
Electrons
transverse momentum
closures
muons
asymmetry
protons
cross sections
predictions

Bibliographical note

95 pages, 259 figures

Keywords

  • hep-ph
  • hep-ex

Cite this

Ball, R. D., Bertone, V., Carrazza, S., Debbio, L. D., Forte, S., Groth Merrild, P., ... The NNPDF Collaboration (2017). Parton distributions from high-precision collider data. European Journal of Physics C, 2017(77), [663]. https://doi.org/10.1140/epjc/s10052-017-5199-5
Ball, Richard D. ; Bertone, Valerio ; Carrazza, Stefano ; Debbio, Luigi Del ; Forte, Stefano ; Groth Merrild, Patrick ; Guffanti, Alberto ; Hartland, Nathan P. ; Kassabov, Zahari ; Latorre, José I. ; Nocera, Emanuele R. ; Rojo, Juan ; Rottoli, Luca ; Slade, Emma ; Ubiali, Maria ; The NNPDF Collaboration. / Parton distributions from high-precision collider data. In: European Journal of Physics C. 2017 ; Vol. 2017, No. 77.
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Ball, RD, Bertone, V, Carrazza, S, Debbio, LD, Forte, S, Groth Merrild, P, Guffanti, A, Hartland, NP, Kassabov, Z, Latorre, JI, Nocera, ER, Rojo, J, Rottoli, L, Slade, E, Ubiali, M & The NNPDF Collaboration 2017, 'Parton distributions from high-precision collider data' European Journal of Physics C, vol. 2017, no. 77, 663. https://doi.org/10.1140/epjc/s10052-017-5199-5

Parton distributions from high-precision collider data. / Ball, Richard D.; Bertone, Valerio; Carrazza, Stefano; Debbio, Luigi Del; Forte, Stefano; Groth Merrild, Patrick; Guffanti, Alberto; Hartland, Nathan P.; Kassabov, Zahari; Latorre, José I.; Nocera, Emanuele R.; Rojo, Juan; Rottoli, Luca; Slade, Emma; Ubiali, Maria; The NNPDF Collaboration.

In: European Journal of Physics C, Vol. 2017, No. 77, 663, 01.06.2017.

Research output: Contribution to JournalArticleAcademicpeer-review

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AU - Ball, Richard D.

AU - Bertone, Valerio

AU - Carrazza, Stefano

AU - Debbio, Luigi Del

AU - Forte, Stefano

AU - Groth Merrild, Patrick

AU - Guffanti, Alberto

AU - Hartland, Nathan P.

AU - Kassabov, Zahari

AU - Latorre, José I.

AU - Nocera, Emanuele R.

AU - Rojo, Juan

AU - Rottoli, Luca

AU - Slade, Emma

AU - Ubiali, Maria

AU - The NNPDF Collaboration

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N2 - 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 quarks 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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KW - hep-ph

KW - hep-ex

U2 - 10.1140/epjc/s10052-017-5199-5

DO - 10.1140/epjc/s10052-017-5199-5

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VL - 2017

JO - European Physical Journal C. Particles and Fields

JF - European Physical Journal C. Particles and Fields

SN - 1434-6044

IS - 77

M1 - 663

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Ball RD, Bertone V, Carrazza S, Debbio LD, Forte S, Groth Merrild P et al. Parton distributions from high-precision collider data. European Journal of Physics C. 2017 Jun 1;2017(77). 663. https://doi.org/10.1140/epjc/s10052-017-5199-5