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g1 at low x and low Q2 with Polarized ep Colliders

Steven D. Bass, Albert De Roeck

hep-pharXiv:hep-ph/0008289

Abstract

Measurements of g1 at low x and low Q2 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 Q2 between 0.01 and 1 GeV2 --- and to constrain the high-energy part of the Drell-Hearn-Gerasimov sum-rule for polarized photoproduction.

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