Zusammenfassung
The OPERA neutrino experiment at the underground Gran Sasso Laboratory has
measured the velocity of neutrinos from the CERN CNGS beam over a baseline of
about 730 km with much higher accuracy than previous studies conducted with
accelerator neutrinos. The measurement is based on high-statistics data taken
by OPERA in the years 2009, 2010 and 2011. Dedicated upgrades of the CNGS
timing system and of the OPERA detector, as well as a high precision geodesy
campaign for the measurement of the neutrino baseline, allowed reaching
comparable systematic and statistical accuracies. An early arrival time of CNGS
muon neutrinos with respect to the one computed assuming the speed of light in
vacuum of (60.7 6.9 (stat.) 7.4 (sys.)) ns was measured. This anomaly
corresponds to a relative difference of the muon neutrino velocity with respect
to the speed of light (v-c)/c = (2.48 0.28 (stat.) 0.30 (sys.)) \times
10-5.
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