Theoretical issues in PDF determination and associated uncertainties NNPDF Collaboration

Richard D. Ball, Valerio Bertone, Luigi Del Debbio, Stefano Forte*, Alberto Guffanti, Juan Rojo, Maria Ubiali

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

We study several sources of theoretical uncertainty in the determination of parton distributions (PDFs) which may affect current PDF sets used for precision physics at the Large Hadron Collider, and explain discrepancies between them. We consider in particular the use of fixed-flavor versus variable-flavor number renormalization schemes, higher twist corrections, and nuclear corrections. We perform our study in the framework of the NNPDF2.3 global PDF determination, by quantifying in each case the impact of different theoretical assumptions on the output PDFs. We also study in each case the implications for benchmark cross sections at the LHC. We find that the impact in a global fit of a fixed-flavor number scheme is substantial, the impact of higher twists is negligible, and the impact of nuclear corrections is moderate and circumscribed. (C) 2013 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)330-339
Number of pages10
JournalPhysics Letters B
Issue number4-5
Publication statusPublished - 25 Jun 2013

Keywords / Materials (for Non-textual outputs)

  • HERA


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