Determination of the theory uncertainties from missing higher orders on NNLO parton distributions with percent accuracy

Jan 18, 2024
23 pages
Published in:
  • Eur.Phys.J.C 84 (2024) 5, 517
  • Published: May 21, 2024
e-Print:
Report number:
  • TIF-UNIMI-2023-22,
  • Edinburgh 2023/34,
  • CERN-TH-2024-009
Experiments:

Citations per year

2023202420250301
Abstract: (Springer)
We include uncertainties due to missing higher order corrections to QCD computations (MHOU) used in the determination of parton distributions (PDFs) in the recent NNPDF4.0 set of PDFs. We use our previously published methodology, based on the treatment of MHOUs and their full correlations through a theory covariance matrix determined by scale variation, now fully incorporated in the new NNPDF theory pipeline. We assess the impact of the inclusion of MHOUs on the NNPDF4.0 central values and uncertainties, and specifically show that they lead to improved consistency of the PDF determination. PDF uncertainties on physical predictions in the data region are consequently either unchanged or moderately reduced by the inclusion of MHOUs.
Note:
  • 23 pages, 6 figures. Final version, as published in EPJC. Several small improvements; expanded discussion of the phi indicator in sect 4.2
  • parton: distribution function
  • correction: higher-order
  • correlation
  • quantum chromodynamics
  • covariance
  • neural network
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