Theoretical improvements for luminosity monitoring at low energies
  A comparison of theoretical results on NNLO leptonic and hadronic corrections to Bhabha scattering with the Monte Carlo generator BabaYaga@NLO used at meson factories is given. Complete NLO virtual corrections to the $e^+e^- \to \mu^+ \mu^- \gamma$ process are discussed. 
J. Gluza, M. Gunia, T. Riemann, M. Worek
hep-ph