## Nuclear Uncertainties in the Determination of Proton PDFs

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Accepted author manuscript, 4.4 MB, PDF document

Original language English 34 European Physical Journal C: Particles and Fields C79 3 27 Mar 2019 https://doi.org/10.1140/epjc/s10052-019-6793-5 E-pub ahead of print - 27 Mar 2019

### Abstract

We show how theoretical uncertainties due to nuclear effects may be incorporated into global fits of proton parton distribution functions (PDFs) that include deep-inelastic scattering and Drell-Yan data on nuclear targets. We specifically consider the CHORUS, NuTeV and E605 data included in the NNPDF3.1 fit, which used Pb, Fe and Cu targets, respectively. We show that the additional uncertainty in the proton PDFs due to nuclear effects is small, as expected, and in particular that the effect on the $\bar{d}/\bar{u}$ ratio, the total strangeness $s+\bar{s}$, and the strange valence distribution $s-\bar{s}$ is negligible.

• hep-ph