Correlation and combination of sets of parton distributions

@article{Ball2021CorrelationAC,
  title={Correlation and combination of sets of parton distributions},
  author={Richard D. Ball and Stefano Forte and Roy Stegeman},
  journal={The European Physical Journal C},
  year={2021},
  volume={81}
}
We study the correlation between different sets of parton distributions (PDFs). Specifically, viewing different PDF sets as distinct determinations, generally correlated, of the same underlying physical quantity, we examine the extent to which the correlation between them is due to the underlying data. We do this both for pairs of PDF sets determined using a given fixed methodology, and between sets determined using different methodologies. We show that correlations have a sizable component… 

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