Eur. Phys. J. C (2020) 80: 381
https://doi.org/10.1140/epjc/s10052-020-7971-1

Regular Article - Theoretical Physics

Can we fit nuclear PDFs with the high-x CLAS data?

¹ Department of Physics, University of Jyvaskyla, P.O. Box 35, 40014, University of Jyvaskyla, Finland
² Helsinki Institute of Physics, University of Helsinki, P.O. Box 64, 00014, Helsinki, Finland
³ Institut für Theoretische Physik, Universität Regensburg, 93040, Regensburg, Germany

^* e-mail: hannu.paukkunen@jyu.fi

Received: 9 March 2020
Accepted: 24 April 2020
Published online: 8 May 2020

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.