Is factorization for isolated photon cross sections broken?
  Recently the factorization property has been claimed to be broken in the cross section for the production of isolated prompt photons emitted in the final state of hadronic $e^ + e^-$ annihilation. We contest this claim. 
P. Aurenche, M. Fontannaz, J.Ph. Guillet, A. Kotikov and E. Pilon