Precision measurement of the neutrino velocity with the ICARUS detector in the CNGS beam
2012
During May 2012, the CERN-CNGS neutrino beam has been operated for two weeks for a total of 1.8 10^17 pot in
bunchedmode, with a 3 ns narrow width proton beam
bunches, separated by 100 ns. This tightly
bunched
beam structureallows a very accurate
timeof
flightmeasurement of neutrinos from CERN to LNGS on an event-by-event basis. Both the
ICARUS-T600 PMT-DAQ and the CERN-LNGS timing synchronization have been substantially improved for this campaign, taking ad-vantage of additional independent GPS receivers, both at CERN and LNGS as well as of the deployment of the "White Rabbit" protocol both at CERN and LNGS. The
ICARUS-T600 detector has collected 25 beam-associated events; the corresponding
timeof
flighthas been accurately evaluated, using all different time synchronization paths. The measured neutrino
timeof
flightis compatible with the arrival of all events with speed equivalent to the one of light: the difference between the expected value based on the
speedof
lightand the measured value is tof_c - tof_nu = (0.10 \pm 0.67stat. \pm 2.39syst.) ns. This result is in agreement with the value previously reported by the
ICARUScollaboration, tof_c - tof_nu = (0.3 \pm 4.9stat. \pm 9.0syst.) ns, but with improved statistical and systematic errors.
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