The ICARUS experiment and the neutrino velocity measurement

ICARUS T600 Liquid Argon (LAr) Time Projection Chamber (TPC) is located in the HALL B of the Gran Sasso National Laboratory, on axis with the CNGS neutrino beam. It is smoothly and continuously operating since June 2010. The experiment has proved to be well suited to address the superluminal neutrino problem firstly raised by the OPERA experiment. As A.G.Cohen and S.L.Glashow argued, Super-luminal muon neutrinos should lose their energy by producing photons and e^+e^- bremsstrahlung pairs, in analogy with Cerenkov radiation. The lack of observation of such a radiative process in the ICARUS T600 detector, using the CNGS beam neutrino events, immediately refuted a superluminal interpretation of the OPERA result. Moreover the ICARUS collaboration, profiting of two short periods of CNGS beam operation in bunched mode, repeatedly performed a high precision measurement of the neutrino time-of-flight (to@!) which resulted to be compatible with the time-of-flight of a particle traveling at the speed of light: the difference between the expected value based on the speed of light and the measured value is @dt=to@!_c-to@!_@n=0.10+/-0.67_s_t_a_t+/-2.39_s_y_s_t ns.