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

Autori
Adam, T. ; ... ; Jakovčić, Krešimir ; ... ; Kliček, Budimir ; ... ; Ljubičić, Ante ; ... ; Stipčević, Mario ; ... ; Zimmermann, R.

Kolaboracija
OPERA Collaboration

Izvornik
The Journal of high energy physics (1126-6708) 1 (2013); 153, 14

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
neutrino detectors and telescopes ; oscillation

Sažetak
In spring 2012 CERN provided two weeks of a short bunch proton beam dedicated to the neutrino velocity measurement over a distance of 730 km. The OPERA neutrino experiment at the underground Gran Sasso Laboratory used an upgraded setup compared to the 2011 measurements, improving the measurement time accuracy. An independent timing system based on the Resistive Plate Chambers was exploited providing a time accuracy of ~1 ns. Neutrino and anti-neutrino contributions were separated using the information provided by the OPERA magnetic spectrometers. The new analysis profited from the precision geodesy measurements of the neutrino baseline and of the CNGS/LNGS clock synchronization. The neutrino arrival time with respect to the one computed assuming the speed of light in vacuum is found to be δt ν ≡ T OF c − T OF ν = (0.6±0.4 (stat.)±3.0 (syst.)) ns and δtν−≡TOFc−TOFν−=(1.7±1.4(stat.)±3.1(syst.)) ns for ν μ and ν−μ , respectively. This corresponds to a limit on the muon neutrino velocity with respect to the speed of light of −1.8 × 10−6 < (v ν − c)/c < 2.3 × 10−6 at 90% C.L. This new measurement confirms with higher accuracy the revised OPERA result.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA