Eur. Phys. J. C 18, 531-538
g1 at low x and low Q2 with Polarized ep collidersS.D. Bass1 and A. De Roeck2
1 Physik Department, Technische Universität München, 85747 Garching, Germany
2 CERN, 1211 Geneva 23, Switzerland
(Received: 28 August 2000 / Revised version: 9 November 2000 / Published online: 21 December 2000 -© Springer-Verlag 2000)
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.
© Società Italiana di Fisica, Springer-Verlag 2001