Probing Higgs Couplings in e^+ e^- \to \gamma\gamma\gamma
  We investigate the existence of anomalous Higgs boson couplings, $H\gamma\gamma$ and $HZ\gamma$, through the analysis of the process $e^+ e^- \to \gamma\gamma\gamma$ at LEP2 energies. We suggest some kinematical cuts to improve the signal to background ratio and determine the capability of LEP2 to impose bounds on those couplings by looking for a Higgs boson signal in this reaction. 
F. de Campos, S. M. Lietti, S. F. Novaes and R. Rosenfeld