N. Yu. Agafonova, M. Aglietta, P. Antonioli, V. V. Ashikhmin, G. Bari, R. Bertoni, E. Bressan, G. Bruno, V. L. Dadykin, W. Fulgione, P. Galeotti, M. Garbini, P. L. Ghia, P. Giusti, E. Kemp, A. S. Mal'gin, B. Miguez, A. Molinario, R. Persiani, I. A. Pless, V. G. Ryasny, O. G. Ryazhskaya, O. Saavedra, G. Sartorelli, I. R. Shakyrianova, M. Selvi, G. Trinchero, C. Vigorito, V. F. Yakushev, A. Zichichi, A. Razeto
We report the measurement of the time-of-flight of ~17 GeV muon neutrinos on the CNGS baseline (732 km) with the Large Volume Detector (LVD) at the Gran Sasso Laboratory. The CERN-SPS accelerator has been operated from May 10th to May 24th 2012, with a tightly bunched-beam structure to allow the velocity of neutrinos to be accurately measured on an event-by-event basis. LVD has detected 48 neutrino events, associated to the beam, with a high absolute time accuracy. These events allow to establish the following limit on the difference between the neutrino speed and the light velocity: -3.8 x 10-6 < (v-c)/c < 3.1 x 10-6 (at 99% C.L.). This value is an order of magnitude lower than previous direct measurements.
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http://arxiv.org/abs/1208.1392
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