Speaker
Description
We present CJ26, the latest CTEQ-JLab global QCD analysis, which simultaneously determines the proton parton distribution functions and nuclear corrections in deuteron targets. The analysis includes, for the first time in a global fit, the full JLab 6 GeV inclusive DIS dataset together with the first published measurements from the 12 GeV era. Focusing on the large-xx region, we examine the interplay between higher-twist contributions and nucleon off-shell effects in low-energy proton and deuteron data, and assess their impact on the extracted quark and gluon distributions. We also demonstrate the importance of a careful treatment of correlated experimental systematic uncertainties for obtaining high-precision PDF determinations, and discuss how future measurements will further improve our understanding of nuclear effects and the partonic structure of light nuclei.