At the end of the 2011 run, the CERN CNGS neutrino beam has been briefly operated in lower intensity mode with ~10 12p.o.t./pulse and with a proton beam structure made of four LHC-like extractions, each with a narrow width of ~3ns, separated by 524 ns. This very tightly bunched beam allowed a very accurate time-of-flight measurement of neutrinos from CERN to LNGS on an event-by-event basis. The ICARUS T600 detector (CNGS2) has collected 7 beam-associated events, consistent with the CNGS collected neutrino flux of 2.2×10 16p.o.t. and in agreement with the well-known characteristics of neutrino events in the LAr-TPC. The time of flight difference between the speed of light and the arriving neutrino LAr-TPC events has been analysed. The result δt=0.3±4.9(stat.)±9.0(syst.)ns is compatible with the simultaneous arrival of all events with speed equal to that of light. This is in a striking difference with the reported result of OPERA (OPERA Collaboration, 2011) [1] claiming that high energy neutrinos from CERN arrive at LNGS ~60ns earlier than expected from luminal speed. © 2012 Elsevier B.V.
CITATION STYLE
Antonello, M., Aprili, P., Baiboussinov, B., Baldo Ceolin, M., Benetti, P., Calligarich, E., … Serrano, J. (2012). Measurement of the neutrino velocity with the ICARUS detector at the CNGS beam. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 713(1), 17–22. https://doi.org/10.1016/j.physletb.2012.05.033
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