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Title: Parton distributions from high-precision collider data: NNPDF Collaboration

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-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 inmore » 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.« less

Authors:
 [1];  [2];  [3];  [1]; ORCiD logo [4];  [1];  [5];  [2];  [4];  [6];  [7];  [2];  [7];  [7];  [8]
  1. Univ. of Edinburgh, Scotland (United Kingdom)
  2. Vrije Univ., Amsterdam (Netherlands)
  3. European Organization for Nuclear Research (CERN), Geneva (Switzerland)
  4. Univ. degli Studi di Milano (Italy)
  5. Univ. of Turin, Torino (Italy)
  6. Univ.Barcelona (Spain)
  7. Univ. of Oxford (United Kingdom)
  8. Univ. of Cambridge (United Kingdom)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE
Contributing Org.:
NNPDF Collaboration
OSTI Identifier:
1544009
Resource Type:
Accepted Manuscript
Journal Name:
European Physical Journal. C, Particles and Fields
Additional Journal Information:
Journal Volume: 77; Journal Issue: 10; Journal ID: ISSN 1434-6044
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Physics

Citation Formats

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, and Ubiali, Maria. Parton distributions from high-precision collider data: NNPDF Collaboration. United States: N. p., 2017. Web. doi: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. Parton distributions from high-precision collider data: NNPDF Collaboration. United States. doi: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, and Ubiali, Maria. Wed . "Parton distributions from high-precision collider data: NNPDF Collaboration". United States. doi:10.1140/epjc/s10052-017-5199-5. https://www.osti.gov/servlets/purl/1544009.
@article{osti_1544009,
title = {Parton distributions from high-precision collider data: NNPDF Collaboration},
author = {Ball, Richard D. and Bertone, Valerio and Carrazza, Stefano and Debbio, Luigi Del and Forte, Stefano and Groth-Merrild, Patrick and Guffanti, Alberto and Hartland, Nathan P. and Kassabov, Zahari and Latorre, José I. and Nocera, Emanuele R. and Rojo, Juan and Rottoli, Luca and Slade, Emma and Ubiali, Maria},
abstractNote = {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.},
doi = {10.1140/epjc/s10052-017-5199-5},
journal = {European Physical Journal. C, Particles and Fields},
number = 10,
volume = 77,
place = {United States},
year = {2017},
month = {10}
}

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