Semi-inclusive and exclusive measurements with EIC: The advantages of lower energies
Abstract
Exploring the nucleon's sea quark and gluon structure is a prime objective of a future electron-ion collider (EIC). Many of the key questions require accurate differential semi-inclusive (spin/flavor decomposition, orbital motion) and exclusive (spatial distributions of quarks/gluons) DIS measurements in the region 0.01 < x < 0.3 and Q2 ~ few 10 GeV2. Such measurements could ideally be performed with a high-luminosity collider of moderate CM energy, s ~ 103 GeV2, and relatively symmetric configuration, e.g. Ee/Ep = 5/30-60 GeV. Specific examples are presented, showing the advantages of this setup (angular/energy distribution of final-state particles, large-x coverage) compared to typical high-energy colliders.
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