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In spring 2012 CERN provided two weeks of a short bunch proton beam dedicatedto the neutrino velocity measurement over a distance of 730 km. The OPERAneutrino experiment at the underground Gran Sasso Laboratory used an upgradedsetup compared to the 2011 measurements, improving the measurement timeaccuracy. An independent timing system based on the Resistive Plate Chamberswas exploited providing a time accuracy of $\sim$1 ns. Neutrino andanti-neutrino contributions were separated using the information provided bythe OPERA magnetic spectrometers. The new analysis profited from the precisiongeodesy measurements of the neutrino baseline and of the CNGS/LNGS clocksynchronization. The neutrino arrival time with respect to the one computedassuming the speed of light in vacuum is found to be $\delta t_\nu \equiv TOF_c- TOF_\nu= (0.6 \pm 0.4\ (stat.) \pm 3.0\ (syst.))$ ns and $\deltat_{\bar{\nu}} \equiv TOF_c - TOF_{\bar{\nu}} = (1.7 \pm 1.4\ (stat.) \pm 3.1\(syst.))$ ns for $\nu_{\mu}$ and $\bar{\nu}_{\mu}$, respectively. Thiscorresponds to a limit on the muon neutrino velocity with respect to the speedof light of $-1.8 \times 10^{-6} < (v_{\nu}-c)/c < 2.3 \times 10^{-6}$ at 90%C.L. This new measurement confirms with higher accuracy the revised OPERAresult.

Measurement of the neutrino velocity with the OPERA detector in the CNGS beam using the 2012 dedicated data