\(g_1\) at low x and low \(Q^2\) with Polarized ep colliders
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Measurements of \(g_1\) at low x and low \(Q^2\) are expected to provide a sensitive probe of the transition from Regge to perturbative QCD dynamics, offering a new testing ground for models of small x physics. We discuss the potential of polarized ep colliders (Polarized HERA and eRHIC) to investigate this physics – varying \(Q^2\) between 0.01 and 1 GeV\(^2\)– and to constrain the high-energy part of the Drell-Hearn-Gerasimov sum-rule for polarized photoproduction.
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