Published January 1, 2012
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Search for nu(mu) -> nu(tau) oscillation with the OPERA experiment in the CNGS beam
Creators
- 1. Russian Acad Sci, INR, RUS-117312 Moscow, Russia
- 2. INFN, Sez Napoli, I-80125 Naples, Italy
- 3. METU, TR-06531 Ankara, Turkey
- 4. Moscow MV Lomonosov State Univ, SINP MSU Skobeltsyn Inst Nucl Phys, RUS-119992 Moscow, Russia
- 5. Kobe Univ, Kobe, Hyogo 6578501, Japan
- 6. Univ Bern, LHEP, Albert Einstein Ctr Fundamental Phys, CH-3012 Bern, Switzerland
- 7. Univ Lyon 1, IPNL, CNRS, IN2P3, F-69622 Villeurbanne, France
- 8. ETH, Inst Particle Phys, CH-8093 Zurich, Switzerland
- 9. Russian Acad Sci, LPI, Moscow 119991, Russia
- 10. INFN, Sez Padova, I-35131 Padua, Italy
- 11. Univ Savoie, LAPP, CNRS, IN2P3, F-74941 Annecy Le Vieux, France
Description
The OPERA neutrino experiment in the underground Gran Sasso Laboratory (LNGS) was designed to perform the first detection of neutrino oscillations in direct appearance mode in the nu(mu) -> nu(tau) channel, the nu(tau) signature being the identification of the tau-lepton created in its charged current interaction. The hybrid apparatus consists of a large mass emulsion film/lead target complemented by electronic detectors. Placed in the LNGS, it is exposed to the high-energy long-baseline CERN Neutrino beam to Gran Sasso (CNGS) 730 km away from the neutrino source. The observation of a first nu(tau) candidate event was reported in 2010. In this paper, we discuss the result of the analysis of the data taken during the first two years of operation (2008-2009) underlining the major improvements brought to the analysis chain and to the Monte Carlo simulations. The statistical significance of the one event observed so far is then evaluated to 95%.
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