Eur. Phys. J. C 18, 531-538
DOI: 10.1007/s100520100547

g₁ at low x and low Q² with Polarized ep colliders

S.D. Bass¹ and A. De Roeck<sup>2

1</sup>  Physik Department, Technische Universität München, 85747 Garching, Germany
²  CERN, 1211 Geneva 23, Switzerland

This email address is being protected from spambots. You need JavaScript enabled to view it.
This email address is being protected from spambots. You need JavaScript enabled to view it.

(Received: 28 August 2000 / Revised version: 9 November 2000 / Published online: 21 December 2000 -© Springer-Verlag 2000)

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.

© Società Italiana di Fisica, Springer-Verlag 2001