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Published January 1, 2013 | Version v1
Journal article Open

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

Creators

  • 1. Univ Strasbourg, CNRS, IN2P3, IPHC, F-67037 Strasbourg, France
  • 2. ITEP, RUS-117259 Moscow, Russia
  • 3. Ist Nazl Fis Nucl, Sez Napoli, I-80125 Naples, Italy
  • 4. Russian Acad Sci, INR, RUS-117312 Moscow, Russia
  • 5. Kobe Univ, J-6578501 Kobe, Hyogo, Japan
  • 6. Univ Bern, LHEP, Albert Einstein Ctr Fundamental Phys, CH-3012 Bern, Switzerland
  • 7. Univ Lyon 1, CNRS, IN2P3, IPNL, F-69622 Villeurbanne, France
  • 8. ETH, Inst Particle Phys, CH-8093 Zurich, Switzerland
  • 9. Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Rome, Italy
  • 10. Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy
  • 11. Univ Savoie, CNRS, IN2P3, LAPP, F-74941 Annecy Le Vieux, France
  • 12. Univ Hamburg, D-22761 Hamburg, Germany

Description

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 similar to 1 ns. Neutrino and anti-neutrino contribution were separated using the information provided by the OPERA magnetic spectrometers. The new analysis profited from the precision geodesy measurements of the neutrino beaseline 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 delta t(nu) equivalent to TOFc - TOF nu = (0.6 +/- 0.4 (stat.)+/- 3.0 (syst.)) and delta t((nu) over bar) equivalent to TOFc-TOF(nu) over bar = (1.7 +/- 1.4 (stat.)+/- 3.1 (syst.)) ns for nu(mu) and (nu) over bar (mu), respectively. This corresponds to a limit on the muon neutrino velocity with respect to the speed of light of -1.8 x 10(-6) < (V-nu - c)/c < 2.3 x 10(-6) at 90% C.L. This new measurement confirms with higher accuracy the revised OPERA result.

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