Some light on "Measurement of the neutrino velocity with the OPERA detector in the CNGS beam"

The recent publication in ArXiv of "Measurement of the neutrino velocity with the OPERA detector in the CNGS beam" has attracted many interest due to the possible theoretical or phenomenological interpretation of the results. A subtle broadening effect on the size of the neutrino pulse appearing in the OPERA measurements is analyzed in this paper to show that the results are in agreement with "classical" theory of relativity.