OPERA tau neutrino candidate event 11213015702

The event is completely contained in the second super-module and there are no hits in the spectrometer. No muon was identified by the reconstruction of the data provided by electronic detectors.All tracks possibly related to the interaction were searched for in the brick within an angular acceptance defined by $\tan\theta=3$.</p><p>The primary vertex of this event is in the lead plate between the $37^{th}$ and $38^{th}$ emulsion films and it is composed by two tracks and a heavily ionizing one.

One of the two tracks, after 256~$\mu$m, decays into three hadrons which were found in the downstream film. The kink angle, evaluated as the mean kink angle for each daughter track, is 83~mrad.</p><p>One of the daughters interacts in the downstream lead, at a depth of 56~$\mu$m from the upstream face of the lead plate, forming two backwards heavily ionizing (black) tracks, a grey track that exits the brick laterally after a couple of films and another track, identified as a proton from the analysis of its ionization.