Nuclear parton distribution functions (NPDFs) are determined by a global analysis of experimental measurements on structure‐function ratios F2A/F2A and Drell‐Yan cross section ratios σDYADYA, and their uncertainties are estimated by the Hessian method. The NPDFs are obtained in both leading order (LO) and next‐to‐leading order (NLO) of αs. As a result, valence‐quark distributions are relatively well determined, whereas antiquark distributions at x>0.2 and gluon distributions in the whole x region have large uncertainties. The NLO uncertainties are slightly smaller than the LO ones; however, such a NLO improvement is not as significant as the nucleonic case.

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