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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. 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. Wed . "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},
journal = {European Physical Journal. C, Particles and Fields},
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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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
journal, October 2005


Pinning down the large-x gluon with NNLO top-quark pair differential distributions
text, January 2017


Dynamical scales for multi-TeV top-pair production at the LHC
text, January 2017


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>W</mml:mi><mml:mo>→</mml:mo><mml:mi>τ</mml:mi><mml:msub><mml:mi>ν</mml:mi><mml:mi>τ</mml:mi></mml:msub></mml:math> cross section in pp collisions at <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:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>7</mml:mn><mml:mtext> TeV</mml:mtext></mml:math> with the ATLAS experiment
journal, January 2012


NNLO QCD corrections to jet production at hadron colliders from gluon scattering
text, January 2014


The NNLO QCD corrections to Z boson production at large transverse momentum
text, January 2016


Event generation with SHERPA 1.1
text, January 2009

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Review of Particle Physics
text, January 2018


LHAPDF6: parton density access in the LHC precision era
text, January 2015


Scattering amplitudes with open loops
text, January 2012

  • Cascioli, F.; Maierhöfer, P.; Pozzorini, S.
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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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Review of Particle Physics
text, January 2012

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HERAFitter : Open Source QCD Fit Project
text, January 2015


HERA data and DGLAP evolution: theory and phenomenology
text, January 2010


FEWZ 2.0: A code for hadronic Z production at next-to-next-to-leading order
text, January 2010


APFEL: A PDF Evolution Library with QED corrections
text, January 2013


Delineating parton distributions and the strong coupling
text, January 2014


Updated Higgs cross section at approximate N$^3$LO
text, January 2014


A compression algorithm for the combination of PDF sets
preprint, January 2015


Parton distributions with threshold resummation
text, January 2015


Intrinsic charm in a matched general-mass scheme
text, January 2015


High-precision differential predictions for top-quark pairs at the LHC
text, January 2015


Phenomenology of the Z-boson plus jet process at NNLO
text, January 2016


How bright is the proton? A precise determination of the photon parton distribution function
text, January 2016


Pinning down the large-x gluon with NNLO top-quark pair differential distributions
text, January 2016


Parton distributions with threshold resummation
journal, September 2015

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  • Journal of High Energy Physics, Vol. 2015, Issue 9
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Charm production in the forward region: constraints on the small-x gluon and backgrounds for neutrino astronomy
journal, November 2015

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FEWZ 2.0: A code for hadronic Z production at next-to-next-to-leading order
journal, November 2011


Top++: A program for the calculation of the top-pair cross-section at hadron colliders
journal, November 2014


Perturbatively stable resummed small x evolution kernels
journal, May 2006


Resummation of hadroproduction cross-sections at high energy
journal, June 2008


Small x resummation with quarks: Deep-inelastic scattering
journal, August 2008


PDF4LHC recommendations for LHC Run II
journal, January 2016

  • Butterworth, Jon; Carrazza, Stefano; Cooper-Sarkar, Amanda
  • Journal of Physics G: Nuclear and Particle Physics, Vol. 43, Issue 2
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Heavy quark initiated contributions to deep inelastic structure functions
journal, October 1998


Intrinsic charm parton distribution functions from CTEQ-TEA global analysis
journal, April 2014


Precise QCD Predictions for the Production of a Z Boson in Association with a Hadronic Jet
journal, July 2016


Vector-Boson Fusion Higgs Production at Three Loops in QCD
journal, August 2016


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
journal, March 2015


An unbiased Hessian representation for Monte Carlo PDFs
journal, August 2015


Dynamical scales for multi-TeV top-pair production at the LHC
text, January 2017


Pinning down the large-x gluon with NNLO top-quark pair differential distributions
text, January 2017


Parton Distribution Functions
conference, October 2016

  • Carrazza, Stefano; Kassabov, Zahari
  • Proceedings of VII Workshop Italiano sulla fisica pp a LHC — PoS(PP@LHC2016)
  • DOI: 10.22323/1.278.0020

A Higher Order Perturbative Parton Evolution Toolkit (HOPPET)
text, January 2008


Heavy quarks in deep-inelastic scattering
text, January 2010


Rivet user manual
text, January 2010


HERA data and DGLAP evolution: theory and phenomenology
text, January 2010


Precision determination of alpha_s using an unbiased global NLO parton set
text, January 2011


Precision NNLO determination of alpha_s(M_Z) using an unbiased global parton set
text, January 2011


Progress in the Determination of the Partonic Structure of the Proton
text, January 2013


Higgs production in gluon fusion beyond NNLO
text, January 2013


APFEL: A PDF Evolution Library with QED corrections
text, January 2013


MCgrid: projecting cross section calculations on grids
text, January 2013


$W$-boson production in association with a jet at next-to-next-to-leading order in perturbative QCD
text, January 2015


The PDF4LHC report on PDFs and LHC data: Results from Run I and preparation for Run II
text, January 2015


Charm in Deep-Inelastic Scattering
text, January 2015


Z-boson production in association with a jet at next-to-next-to-leading order in perturbative QCD
text, January 2015


The impact of the final HERA combined data on PDFs obtained from a global fit
text, January 2016


Specialized minimal PDFs for optimized LHC calculations
text, January 2016


Phenomenology of the Z-boson plus jet process at NNLO
text, January 2016


Fitting EMC structure functions with intrinsic charm
preprint, January 2016


How bright is the proton? A precise determination of the photon parton distribution function
text, January 2016


Charm Production: Pole Mass or Running Mass?
text, January 2016


On the NNLO QCD corrections to single-top production at the LHC
text, January 2014


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Subleading Power Rapidity Divergences and Power Corrections for $q_T$
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Subleading Power Rapidity Divergences and Power Corrections for $q_T$
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Analytical approaches to the determination of spin-dependent parton distribution functions at NNLO approximation
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Soft-gluon corrections in top-quark production
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Nucleon parton distributions from hadronic quantum fluctuations
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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
text, January 2018

  • Abdolmaleki, Hamed; Bertone, Valerio; Britzger, Daniel
  • Deutsches Elektronen-Synchrotron, DESY, Hamburg
  • DOI: 10.3204/pubdb-2018-05390