We present a Monte?Carlo based analysis of the combined world data on polarized lepton-nucleon deep-inelastic scattering at small Bjorken x within the polarized quark dipole formalism. We show for the first time that double-spin asymmetries at x < 0.1 can be successfully described using only small- x evolution derived from first-principles QCD, allowing predictions to be made for the g 1 structure function at much smaller x . Anticipating future data from the Electron-Ion Collider, we assess the impact of electromagnetic and parity-violating polarization asymmetries on g 1 and demonstrate an extraction of the individual flavor helicity parton distribution functions at small x .
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