Morris, Tim R.
Superluminal velocity through near-maximal neutrino oscillations or by being off shell
Journal of Physics G Nuclear and Particle Physics, 39, (4), . (doi:10.1088/0954-3899/39/4/045010).
Recently it was suggested that the observation of superluminal neutrinos by the OPERA collaboration may be due to group velocity effects resulting from close-to-maximal oscillation between neutrino mass eigenstates, in analogy to known effects in optics. We show that superluminal propagation does occur through this effect for a series of very narrow energy ranges, but this phenomenon cannot explain the OPERA measurement. Superluminal propagation can also occur if one of the neutrino masses is extremely small. However the effect only has appreciable amplitude at energies of order this mass and thus has negligible overlap with the multi-GeV scale of the experiment.
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