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Understanding how sea quarks behave inside a nucleon is one of the mostimportant physics goals of the proposed Electron-Ion Collider in China (EicC),which is designed to have 3.5 GeV polarized electron beam (80% polarization)colliding with 20 GeV polarized proton beam (70% polarization) at instantaneousluminosity of $2 \times 10^{33} {\rm cm}^{-2} {\rm s}^{-1}$. A specific topicat EicC is to understand the polarization of individual quarks inside alongitudinally polarized nucleon. The potential of various future EicC data,including the inclusive and semi-inclusive deep inelastic scattering data fromboth doubly polarized electron-proton and electron-$^3{\rm He}$ collisions, toreduce the uncertainties of parton helicity distributions is explored at thenext-to-leading order in QCD, using the Error PDF Updating Method Package ({\scePump}) which is based on the Hessian profiling method. We show that thesemi-inclusive data are well able to provide good separation between flavourdistributions, and to constrain their uncertainties in the $x>0.005$ region,especially when electron-$^3{\rm He}$ collisions, acting as effectiveelectron-neutron collisions, are taken into account. To enable this study, wehave generated a Hessian representation of the DSSV14 set of PDF replicas,named DSSV14H PDFs.

Determining the helicity structure of the nucleon at the Electron Ion Collider in China