Photoproduction of Jets and Heavy Flavors in Polarized ep - Collisions   at HERA
  We study photoproduction of jets and heavy flavors in a polarized collider mode of HERA at $\sqrt{S}= 298$ GeV. We examine the sensitivity of the cross sections and their asymmetries to the proton's polarized gluon distribution and to the completely unknown parton distributions of longitudinally polarized photons. 
M. Stratmann (Univ. Dortmund), W. Vogelsang (Rutherford)