At the end of the 2011 run, the CERN CNGS neutrino beam has been briefly operated in lower intensity mode with ∼1012 p.o.t./pulse and with a proton beam structure made of four LHC-like extractions, each with a narrow width of ∼3 ns, 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 2.2×1016 p.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 ∼60 ns earlier than expected from luminal speed.

Measurement of the neutrino velocity with the ICARUS detector at the CNGS beam

BALDO, MASSIMILLA;CENTRO, SANDRO;FARNESE, CHRISTIAN;FAVA, ANGELA;GIBIN, DANIELE;VARANINI, FILIPPO;
2012

Abstract

At the end of the 2011 run, the CERN CNGS neutrino beam has been briefly operated in lower intensity mode with ∼1012 p.o.t./pulse and with a proton beam structure made of four LHC-like extractions, each with a narrow width of ∼3 ns, 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 2.2×1016 p.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 ∼60 ns earlier than expected from luminal speed.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11577/2524927
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