HIGHLIGHTS
SUMMARY
In addition to the accuracy of individual PDF fits, or "fitting accuracy," another factor in the total uncertainty may be as consequential, reflecting the accuracy of exploration, or sampling, of the space of acceptable PDF solutions. In this context, sampled solutions can be obtained by varying the fitted data (e_g, by resampling random fluctuations in the measured values as in the NNPDF analyses ), models of theory and experiment (e_g, the PDF parametrization forms or model parameters as in the CT and MSHT studies), and in other ways. Incomplete sampling of PDF solutions may result . . .
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