We report the measurement of the time of flight of ∼17 GeV νμ 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 with the beam, with a high absolute time accuracy. These events allow us to establish the following limit on the difference between the neutrino speed and the light velocity: -3.8×10-6<(vν-c)/c<3.1×10-6 (at 99% C.L.). This value is an order of magnitude lower than previous direct measurements.
N. Yu. Agafonova, M. Aglietta, P. Antonioli, V. V. Ashikhmin, G. Bari, R. Bertoni, et al. (2012). Measurement of the Velocity of Neutrinos from the CNGS Beam with the Large Volume Detector. PHYSICAL REVIEW LETTERS, 109, 070801-070801-5 [10.1103/PhysRevLett.109.070801].
Measurement of the Velocity of Neutrinos from the CNGS Beam with the Large Volume Detector
ANTONIOLI, PIETRO;BRESSAN, ELISA;GARBINI, MARCO;GIUSTI, PAOLO;PERSIANI, RINO;SARTORELLI, GABRIELLA;SELVI, MARCO;ZICHICHI, ANTONINO;
2012
Abstract
We report the measurement of the time of flight of ∼17 GeV νμ 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 with the beam, with a high absolute time accuracy. These events allow us to establish the following limit on the difference between the neutrino speed and the light velocity: -3.8×10-6<(vν-c)/c<3.1×10-6 (at 99% C.L.). This value is an order of magnitude lower than previous direct measurements.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
