Global fit finds u and d PDFs stable to x≈0.8 with positive isospin-independent higher-twist corrections and nonzero off-shell nucleon contributions required to describe nuclear data.
Doveet al., Nature590, 561 (2021), arXiv:2103.04024 [hep-ph]
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Stability of parton distributions at high $x$: impact of nuclear and power corrections
Global fit finds u and d PDFs stable to x≈0.8 with positive isospin-independent higher-twist corrections and nonzero off-shell nucleon contributions required to describe nuclear data.