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

Abstract

Understanding how sea quarks behave inside a nucleon is one of the most important 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 instantaneous luminosity of $2\times 10^{33}{\mathrm{cm}}^{-2}{\mathrm{s}}^{-1}$. A specific topic at EicC is to understand the polarization of individual quarks inside a longitudinally polarized nucleon. The potential of various future EicC data, including the inclusive and semi-inclusive deep inelastic scattering data from both doubly polarized electron-proton and electron-${}^3\mathrm{He}$ collisions, to reduce the uncertainties of parton helicity distributions is explored at the next-to-leading order in QCD, using the Error PDF Updating Method Package ({\sc ePump}) which is based on the Hessian profiling method. We show that the semi-inclusive data are well able to provide good separation between flavour distributions, and to constrain their uncertainties in the $x>0.005$ region, especially when electron-${}^3\mathrm{He}$ collisions, acting as effective electron-neutron collisions, are taken into account. To enable this study, we have generated a Hessian representation of the DSSV14 set of PDF replicas, named DSSV14H PDFs.

arXiv comment40 pages, 12 figures

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• $\Delta$-baryon axialvector and pseudoscalar form factors, and associated PCAC relations
• Nucleon Short-Range Correlations and High-Momentum Dynamics: Implications on the Equation of State of Dense Matter
• Nucleon Structure from Basis Light-Front Quantization : Status and Prospects
• AAK24: Global QCD analysis on polarized parton distribution in the presence of $A_2$ asymmetry measurements