Abstract
Nuclear parton distribution functions (nuclear PDFs) are non-perturbative objects that encode the partonic behaviour of bound nucleons. To avoid potential higher-twist contributions, the data probing the high-x end of nuclear PDFs are sometimes left out from the global extractions despite their potential to constrain the fit parameters. In the present work we focus on the kinematic corner covered by the new high-x data measured by the CLAS/JLab collaboration. By using the Hessian re-weighting technique, we are able to quantitatively test the compatibility of these data with globally analyzed nuclear PDFs and explore the expected impact on the valence-quark distributions at high x. We find that the data are in a good agreement with the EPPS16 and nCTEQ15 nuclear PDFs whereas they disagree with TuJu19. The implications on flavour separation, higher-twist contributions and models of EMC effect are discussed.
Highlights
The nuclear parton distribution functions[1,2] quantifying the structure of quarks and gluons in bound nucleons constitute an indispensable ingredient in precision calculations for processes at high interaction scales Q2in high-energy colliders like the Large HadronCollider (LHC)
We find that the data are in a good agreement with the EPPS16 and nCTEQ15 nuclear PDFs whereas they disagree with TuJu19
Given the fact that high-energy nuclear deeply inelastic scattering (DIS) at the Electron-Ion Collider (EIC) [18] or at the planned LHeC/FCC-eh [19] are at least a decade away, the community has generally sought to improve the situation by using the Large HadronCollider (LHC) proton-lead data as new constraints in the global analyses
Summary
[1,2] quantifying the structure of quarks and gluons in bound nucleons constitute an indispensable ingredient in precision calculations for processes at high interaction scales
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