At the end of the 2011 run, the CERN CNGS neutrino beam has been briefly operated in lower intensity mode with similar to 10(12) p.o.t/pulse and with a proton beam structure made of four LHC-like extractions, each with a narrow width of similar to 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 x 10(16) 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 delta t = 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 similar to 60 ns earlier than expected from luminal speed. (C) 2012 Elsevier B.V. All rights reserved.
Measurement of the neutrino velocity with the ICARUS detector at the CNGS beam / M., Antonello; P., Aprili; B., Baiboussinov; M. B., Ceolin; P., Benetti; E., Calligarich; N., Canci; S., Centro; A., Cesana; K., Cieslik; D. B., Cline; A. G., Cocco; A., Dabrowska; D., Dequal; A., Dermenev; R., Dolfini; C., Farnese; A., Fava; A., Ferrari; Fiorillo, Giuliana; D., Gibin; A. G., Berzolari; S., Gninenko; A., Guglielmi; M., Haranczyk; J., Holeczek; A., Ivashkin; J., Kisiel; I., Kochanek; J., Lagoda; S., Mania; G., Mannocchi; A., Menegolli; G., Meng; C., Montanari; S., Otwinowski; L., Periale; A., Piazzoli; P., Picchi; F., Pietropaolo; P., Plonski; A., Rappoldi; G. L., Raselli; M., Rossella; C., Rubbia; P., Sala; E., Scantamburlo; A., Scaramelli; E., Segreto; F., Sergiampietri; D., Stefan; J., Stepaniak; R., Sulej; M., Szarska; M., Terrani; F., Varanini; S., Ventura; C., Vignoli; H. G., Wang; A., Zalewska; K., Zaremba; P. A., Sanchez; J., Serrano. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 713:(2012), pp. 17-22. [10.1016/j.physletb.2012.05.033]
Measurement of the neutrino velocity with the ICARUS detector at the CNGS beam
FIORILLO, GIULIANA;
2012
Abstract
At the end of the 2011 run, the CERN CNGS neutrino beam has been briefly operated in lower intensity mode with similar to 10(12) p.o.t/pulse and with a proton beam structure made of four LHC-like extractions, each with a narrow width of similar to 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 x 10(16) 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 delta t = 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 similar to 60 ns earlier than expected from luminal speed. (C) 2012 Elsevier B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
