#### Oscillation Project with Emulsion-tRacking Apparatus

The OPERA experiment has been designed to perform the most straightforward test of the phenomenon of neutrino oscillations. This experiment exploits the CNGS high-intensity and high-energy beam of muon neutrinos produced at the CERN SPS in Geneva pointing towards the LNGS underground laboratory at Gran Sasso, 730 km away in central Italy. OPERA is located in the Hall C of LNGS and it is aimed at detecting for the first time the appearance of tau-neutrinos from the transmutation (oscillation) of muon-neutrinos during their 3 millisecond travel from Geneva to Gran Sasso. In OPERA, tau-leptons resulting from the interaction of tau-neutrinos will be observed in "bricks" of photographic emulsion films interleaved with lead plates. The apparatus contains about 150000 of such bricks for a total mass of 1300 tons and is complemented by electronic detectors (trackers and spectrometers) and ancillary infrastructure. Its construction has been completed in spring 2008 and the experiment is currently in data taking.

See "News and Updates" for the OPERA neutrino tau analysis

## The most recent articles

### New preprint on recent OPERA results is on arXiv

Tuesday 13 August 2013 par
New paper " New results on $ν_μ\to ν_τ$ appearance with the OPERA experiment in the CNGS beam" is on arXiv This work describes substantial improvements in the analysis and in the evaluation of the detection efficiencies and backgrounds using new simulation tools. The analysis is extended to a (...)

### New results of the OPERA experiment presented at CERN

Monday 17 June 2013 par
Recently, on June 11 2013 the new results on the neutrino oscillations from the OPERA experiment were presented at the seminar at CERN. The slides and videorecord of the talk of Prof.Giovanni de Lellis are vailable here

### New neutrino oscillation event discovered at OPERA

INFN Press Release
Wednesday 27 March 2013
PRESS RELEASE March 26, 2013 OPERA observed a third neutrino tau The OPERA international experiment at the INFN Gran Sasso Laboratory (Italy) has observed a third neutrino “flavour” oscillation. The “muon-type” neutrino produced at CERN in Geneva arrived at the Gran Sasso laboratory as a “tau” (...)

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