Speaker
Takuya Omura
(Nagoya University)
Description
The OPERA experiment aims at providing a direct proof of the $\nu_{\mu} \to \nu_{\tau}$ oscillations by observing $\nu_{\tau}$ CC interactions in an almost pure $\nu_{\mu}$ accelerator beam, the CNGS (CERN Neutrinos to Gran Sasso).
The beam exposure started in 2008 and ended in 2012. Events recorded in the Emulsion Cloud Chamber detectors, made of lead plates and nuclear emulsions, are being analysed since 2008.
In the last period, a large additional amount of data has been extracted, leading to the validation of a 4th $\nu_{\tau}$ candidate event. This new result brings the observation of the oscillation to a significance exceeding 4 sigma.
