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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:
Journal Article: 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. 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, and Ubiali, Maria. 2017. "Parton distributions from high-precision collider data: NNPDF Collaboration". United States. https://doi.org/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},
url = {https://www.osti.gov/biblio/1544009}, journal = {European Physical Journal. C, Particles and Fields},
issn = {1434-6044},
number = 10,
volume = 77,
place = {United States},
year = {Wed Oct 04 00:00:00 EDT 2017},
month = {Wed Oct 04 00:00:00 EDT 2017}
}

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  • Thorne, Robert Samuel; Harland-Lang, Lucian; Martin, Alan
  • Proceedings of The European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2015)
  • https://doi.org/10.22323/1.234.0505

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Measurement of the <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:mi>t</mml:mi><mml:mover accent="true"><mml:mi>t</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math> production cross section in <mml:math altimg="si2.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:mi>p</mml:mi><mml:mover accent="true"><mml:mi>p</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math> collisions at <mml:math altimg="si3.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>1.96</mml:mn><mml:mtext> </mml:mtext><mml:mtext>TeV</mml:mtext></mml:math> using lepton+jets events with lifetime b-tagging
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Review of Particle Physics
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LHAPDF6: parton density access in the LHC precision era
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Scattering amplitudes with open loops
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Measurement of the lepton charge asymmetry in inclusive W production in pp collisions at $ \sqrt {s} = 7\;{\text{TeV}} $
journal, April 2011


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HERA data and DGLAP evolution: theory and phenomenology
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APFEL: A PDF Evolution Library with QED corrections
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Delineating parton distributions and the strong coupling
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Updated Higgs cross section at approximate N$^3$LO
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A compression algorithm for the combination of PDF sets
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Parton distributions with threshold resummation
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Intrinsic charm in a matched general-mass scheme
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High-precision differential predictions for top-quark pairs at the LHC
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Phenomenology of the Z-boson plus jet process at NNLO
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Pinning down the large-x gluon with NNLO top-quark pair differential distributions
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Parton distributions with threshold resummation
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Charm production in the forward region: constraints on the small-x gluon and backgrounds for neutrino astronomy
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FEWZ 2.0: A code for hadronic Z production at next-to-next-to-leading order
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Resummation of hadroproduction cross-sections at high energy
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Small x resummation with quarks: Deep-inelastic scattering
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PDF4LHC recommendations for LHC Run II
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Heavy quark initiated contributions to deep inelastic structure functions
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Intrinsic charm parton distribution functions from CTEQ-TEA global analysis
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Precise QCD Predictions for the Production of a Z Boson in Association with a Hadronic Jet
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Vector-Boson Fusion Higgs Production at Three Loops in QCD
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Erratum: Fully Differential Vector-Boson-Fusion Higgs Production at Next-to-Next-to-Leading Order [Phys. Rev. Lett. 115 , 082002 (2015)]
journal, March 2018


LHAPDF6: parton density access in the LHC precision era
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An unbiased Hessian representation for Monte Carlo PDFs
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Dynamical scales for multi-TeV top-pair production at the LHC
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Pinning down the large-x gluon with NNLO top-quark pair differential distributions
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Parton Distribution Functions
conference, October 2016


Heavy quarks in deep-inelastic scattering
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Rivet user manual
text, January 2010


HERA data and DGLAP evolution: theory and phenomenology
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Precision determination of alpha_s using an unbiased global NLO parton set
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Precision NNLO determination of alpha_s(M_Z) using an unbiased global parton set
text, January 2011


Higgs production in gluon fusion beyond NNLO
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APFEL: A PDF Evolution Library with QED corrections
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MCgrid: projecting cross section calculations on grids
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Charm in Deep-Inelastic Scattering
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The impact of the final HERA combined data on PDFs obtained from a global fit
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Specialized minimal PDFs for optimized LHC calculations
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Phenomenology of the Z-boson plus jet process at NNLO
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On the NNLO QCD corrections to single-top production at the LHC
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Computation of parton distributions from the quasi-PDF approach at the physical point
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Subleading Power Rapidity Divergences and Power Corrections for $q_T$
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Moments of nucleon generalized parton distributions from lattice QCD simulations at physical pion mass
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Subleading Power Rapidity Divergences and Power Corrections for $q_T$
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Performance of the reconstruction and identification of high-momentum muons in proton-proton collisions at $\sqrt{s} =$ 13 TeV
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Complete matching for quasidistribution functions in large momentum effective theory
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Matching generalized parton quasidistributions in the RI/MOM scheme
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Factorization of Jet Cross Sections in Heavy-Ion Collisions
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Impact of low-$x$ resummation on QCD analysis of HERA data
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