Pair Production Constraints on Superluminal Neutrinos Revisited
  We revisit the pair creation constraint on superluminal neutrinos considered by Cohen and Glashow in order to clarify which types of superluminal models are constrained. We show that a model in which the superluminal neutrino is effectively light-like can evade the Cohen-Glashow constraint. 
Stanley J. Brodsky, Susan Gardner
hep-ph