At present OPERA open data sample includes two sub-samples. The first (nuMu) data sub-sample includes 817 events used in the study of charged hadron multiplicities in charged-current neutrino-lead interactions in the OPERA detector. The second (nuTau) data sub-sample includes 10 tau neutrino candidate events observed by OPERA in CNGS neutrino beam. Event sub-sample to display can be specified in the left part of the toolbar.
Opera hybrid experimental setup (described in detail here) included Electronic detectors (ED) for real-time detection of neutrino interactions and nuclear emulsions for precision analysis of neutrino event topologies. The ED provided positions of hits in two perpendicular planes: XZ (top view) and YZ (side view). By default, only ED information is displayed in the Demobbed-viewer. After analysis of the ED data a unit of OPERA target (lead-emulsion or ECC-brick) most probably contained the neutrino interaction vertex was extracted from the detector and its emulsion data was analysed as well. 3D view of reconstructed emulsion data can be opened in the ECC-display (see description below).
Brief description of available button actions:
/ - go to the previous/next event (if any) in the selected sub-sample. Also the event Id (10- or 11-digit number) can be specified directly in the nearest edit box.
- reload the currently displayed event.
/ - zoom in/out. Please note, that the default (whole detector) views of the ED display can't be zoomed out.
- move the XZ and YZ camera views to the vertex brick. ECC-brick that contains the primary neutrino interaction vertex will be shown (an appropriate zooming will be adjusted automatically). The vertex position as well as projections of muon and some long hadron tracks found in the emulsion will be displayed as well.
- move the XZ and YZ camera views and adjust zooming in order to display the whole neutrino event region.
- show the whole detector region (default option).
, , , and - move the camera views, correspondingly, up, down, left, and right.
/ - open/close the ECC-event display.
/ - stretch/compress the ECC-view in the vertical (Y) direction.
- start/accelerate animated rotation of the ECC-event around the Y (vertical) axis.
- decelerate/stop animated rotation of the ECC-event.
A browser-based event display for visualisation of open data of the OPERA experiment.
Contributors: S. Dmitrievsky (JINR, Dubna, Russia), I. Tsanaktsidis (CERN, Geneva, Switzerland).