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The NNPDF3.1 parton distribution functions (PDFs) offer improved accuracy and reduced uncertainties by incorporating charm PDFs and new LHC data. These updated PDFs enhance precision for gluon determination and light-quark flavor separation.

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Area of Science:

  • High Energy Physics
  • Quantum Chromodynamics
  • Particle Physics

Background:

  • Parton distribution functions (PDFs) describe the momentum distribution of quarks and gluons within protons and neutrons.
  • Previous global PDF sets, like NNPDF3.0, were determined using a validated closure test methodology.
  • Advancements in methodology and data availability necessitate updates to existing PDF sets.

Purpose of the Study:

  • To present NNPDF3.1, an updated global set of parton distribution functions.
  • To incorporate methodological improvements, including the parametrization of charm PDFs.
  • To include new experimental data from the Tevatron and Large Hadron Collider (LHC).

Main Methods:

  • Parametrization and determination of the charm PDF alongside light-quark and gluon PDFs.
  • Inclusion of new experimental data: D0 W asymmetries, LHCb W/Z production, ATLAS/CMS jet and electroweak boson production, and top-quark pair differential distributions.
  • Analysis of the impact of methodological and data updates on PDF accuracy and stability.

Main Results:

  • NNPDF3.1 increases the number of independent PDFs from seven to eight by including charm.
  • New data and charm parametrization lead to significant impacts on PDFs, with reduced uncertainties.
  • Key improvements include enhanced precision in gluon determination and light-quark flavor separation.

Conclusions:

  • NNPDF3.1 provides a more accurate and stable description of proton structure compared to NNPDF3.0.
  • The updated PDFs have implications for LHC phenomenology, Higgs production cross-sections, and the proton's strangeness and charm content.
  • NNPDF3.1 is delivered in both Hessian and optimized Monte Carlo formats.