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PDF4LHC21: Update on the benchmarking of the CT, MSHT and NNPDF global PDF fits

by Thomas Cridge

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Submission summary

Authors (as registered SciPost users): Thomas Cridge
Submission information
Preprint Link: scipost_202107_00094v1  (pdf)
Date accepted: 2021-08-30
Date submitted: 2021-07-30 20:53
Submitted by: Cridge, Thomas
Submitted to: SciPost Physics Proceedings
Proceedings issue: 28th Annual Workshop on Deep-Inelastic Scattering (DIS) and Related Subjects (DIS2021)
Ontological classification
Academic field: Physics
  • High-Energy Physics - Phenomenology
Approach: Phenomenological


There have been recent updates to the three global PDF fits (CT, MSHT and NNPDF), all adding large amounts of data from the LHC, and this has resulted in significant changes to the global PDFs. Given the impact that the new PDFs will have on physics comparisons at the LHC, it is crucial to perform a benchmarking among the PDFs, similar in spirit to that which was carried out for PDF4LHC15, widely used for LHC physics. In this article we detail a benchmarking comparison of three global PDF sets - CT18, MSHT20 and NNPDF3.1 - and their similarities and differences that have been observed. The end result of this study will be a new PDF4LHC21 ensemble of combined PDFs suitable for a wide range of LHC applications.

Published as SciPost Phys. Proc. 8, 101 (2022)

Submission & Refereeing History

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Submission scipost_202107_00094v1 on 30 July 2021

Reports on this Submission

Anonymous Report 1 on 2021-8-9 (Invited Report)

  • Cite as: Anonymous, Report on arXiv:scipost_202107_00094v1, delivered 2021-08-09, doi: 10.21468/SciPost.Report.3356


1. Clear
2. Detailed




This is a conference proceeding describing work in progress by the PDF4LHC group towards a new comination of PDFs by the CT, NNPDF and MSHT groups.
It covers detailed work on understanding differences by the analysis of reduced data sets using various statistical tools. As such it is a valuable document for the community and easily fulfills publication criteria.

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  • validity: high
  • significance: high
  • originality: high
  • clarity: high
  • formatting: excellent
  • grammar: excellent

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