Published January 1, 2015
| Version v1
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Discovery of tau Neutrino Appearance in the CNGS Neutrino Beam with the OPERA Experiment
Creators
- 1. Russian Acad Sci, Inst Nucl Res, RUS-117312 Moscow, Russia
- 2. Ist Nazl Fis Nucl, Sez Napoli, I-80125 Naples, Italy
- 3. Moscow MV Lomonosov State Univ, SINP MSU Skobeltsyn Inst Nucl Phys, RUS-119991 Moscow, Russia
- 4. Kobe Univ, J-6578501 Kobe, Hyogo, Japan
- 5. Univ Bern, High Energy Phys Lab, Albert Einstein Ctr Fundamental Phys, CH-3012 Bern, Switzerland
- 6. Middle E Tech Univ, TR-06531 Ankara, Turkey
- 7. Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy
- 8. Joint Inst Nucl Res, RUS-141980 Dubna, Russia
- 9. Univ Hamburg, D-22761 Hamburg, Germany
- 10. Russian Acad Sci, PN Lebedev Phys Inst, RUS-119991 Moscow, Russia
- 11. Ist Nazl Fis Nucl, Lab Nazl Gran Sasso, I-67010 Laquila, Italy
Description
The OPERA experiment was designed to search for nu(mu) -> nu(tau) oscillations in appearance mode, i.e., by detecting the tau leptons produced in charged current nu(tau) interactions. The experiment took data from 2008 to 2012 in the CERN Neutrinos to Gran Sasso beam. The observation of the nu(mu) -> nu(tau) appearance, achieved with four candidate events in a subsample of the data, was previously reported. In this Letter, a fifth nu(tau) candidate event, found in an enlarged data sample, is described. Together with a further reduction of the expected background, the candidate events detected so far allow us to assess the discovery of nu(mu) -> nu(tau) oscillations in appearance mode with a significance larger than 5 sigma.
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