Unveiling saturation effects from nuclear structure function measurements at the EIC

Abstract

We analyze the possibility of extracting a clear signal of non-linear parton saturation effects from future measurements of nuclear structure functions at the Electron-Ion Collider (EIC), in the small-x region. Our approach consists in generating pseudodata for electron-gold collisions, using the running-coupling Balitsky-Kovchegov evolution equation, and in assessing the compatibility of these saturate pseudodata with existing sets of nuclear parton distribution functions (nPDFs), extrapolated if necessary. The level of disagreement between the two is quantified by applying a Bayesian reweighting technique. This allows to infer the parton distributions needed in order to describe the pseudodata, which we find quite different from the actual distributions, especially for sea quarks and gluons. This tension suggests that, should saturation effects impact the future nuclear structure function data as predicted, a successful refitting of the nPDFs may not be achievable, which would unambiguously signal the presence of non-linear effects.

arXiv comment16 pages, 5 figures; small detail updated in the summary for clarification and better understanding

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Cited by in corpus (15)

• The Large Hadron-Electron Collider at the HL-LHC
• Mining for Gluon Saturation at Colliders
• Towards Ultimate Parton Distributions at the High-Luminosity LHC
• Nuclear Structure Functions at a Future Electron-Ion Collider
• Nuclear PDFs After the First Decade of LHC Data
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• The improved saturation model in nuclei
• Parametrization of the nuclear structure function
• A simple model for the charm structure function of nuclei
• Twist decomposition of non-linear effects in Balitsky-Kovchegov evolution of proton structure functions
• Nonlinear corrections to the nuclear heavy flavor structure functions
• Signatures of gluon saturation from structure-function measurements