• Help
    Discussion forum
    Search tips
  • About
    CERN Open Data
    ALICE
    ATLAS
    CMS
    DELPHI
    LHCb
    OPERA
    TOTEM
    Glossary

OPERA tau neutrino candidate event 11172035775

OPERA tau neutrino candidate event 11172035775, OPERA collaboration

Cite as: OPERA collaboration (2018). OPERA tau neutrino candidate event 11172035775. CERN Open Data Portal. DOI:10.7483/OPENDATA.OPERA.B6F5.MMPL

There is one publication referring to these data

Dataset Derived OPERA CERN-SPS


Description

This ντ interaction occurred on June 21st 2011 in the first super-module, in wall 14. The activity in the Target Trackers was limited to 13 walls downstream of the vertex brick. 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 tanθ=3.

After the analysis of the interface emulsion films, 7 tracks were found showing a converging path. This finding triggered the brick film development. By the scan-back procedure, the neutrino interaction was located with 5 reconstructed tracks.

The primary vertex of this event is very downstream, between the 54th and 55th emulsion films, about 2~mm from the downstream edge of the brick. It consists of five tracks, one of them exhibiting a kink of 98~mrad after a flight length of 1100~μm.

No heavily ionizing track was found pointing at the secondary vertex, as expected in a decay vertex. A γ-ray was found pointing to primary vertex with an impact parameter of 11~μm and reconstructed momentum of 1.6~GeV/c. All tracks were followed in the downstream brick and classified as hadrons using their overall track length reconstructed along all the downstream available bricks, the topology at their end-point and the correlation between their momentum and range. The energy of the neutrino interaction was measured to be 26.5~GeV/c.

This event was thus interpreted as a ντ charged-current interaction with the τ lepton decaying into a single hadron.

Related datasets

This event is part of OPERA Electronic Detector tau appearance dataset

Electronic detector data for tau neutrino appearance studies

This event is part of OPERA Emulsion Detector tau appearance dataset

Emulsion data for neutrino tau appearance studies

Dataset characteristics

1 events. 14 files. 12.4 KiB in total.

Dataset semantics

Variable Type Description
amplL PMT amplitude measured from the "left" side of a scintillator strip (in photo-electrons)
amplR PMT amplitude measured from the "right" side of a scintillator strip (in photo-electrons)
amplRec PMT amplitude reconstructed from the "left" and "right" side amplitudes of a scintillator strip taking into account light attenuation in a WLS fiber (in photo-electrons)
clLength cluster length (in cm)
driftDist drift distance (in cm)
enHad energy of a hadron jet (in GeV)
enNeu energy of a neutrino (in GeV)
enVis visible energy (in MeV)
evID event Id (10- or 11-digit number)
globPosX X position of a vertex in the OPERA detector system of reference (in cm)
globPosY Y position of a vertex in the OPERA detector system of reference (in cm)
globPosZ Z position of a vertex in the OPERA detector system of reference (in cm)
muMom momentum of a muon (in GeV/c)
posX For Electronic Detector events, X position of a drift tube, RPC, Target Tracker hit in the OPERA detector system of reference (in cm). For Emulsion Detector events, X position of a track/vertex in the OPERA brick system of reference (in micrometers).
posX1 X position of the beginning of a line in the OPERA brick system of reference (in micrometers)
posX2 X position of the end of a line in the OPERA brick system of reference (in micrometers)
posY For Electronic Detector events, Y position of an RPC hit in the OPERA detector system of reference (in cm). For Emulsion Detector events, Y position of a track/vertex in the OPERA brick system of reference (in micrometers).
posY1 Y position of the beginning of a line in the OPERA brick system of reference (in micrometers)
posY2 Y position of the end of a line in the OPERA brick system of reference (in micrometers)
posZ For Electronic Detector events, Z position of a drift tube, RPC, Target Tracker hit in the OPERA detector system of reference (in cm). For Emulsion Detector events, Z position of a track/vertex in the OPERA brick system of reference (in micrometers).
posZ1 Z position of the beginning of a line in the OPERA brick system of reference (in micrometers)
posZ2 Z position of the end of a line in the OPERA brick system of reference (in micrometers)
primary flag of a vertex: 1 - primary vertex; 0 - not primary vertex
slopeXZ tangent of a track angle in XZ view
slopeYZ tangent of a track angle in YZ view
timestamp event time in milliseconds since 01/01/1970
trType type of a track: 1 - muon; 2 - hadron; 3 - electron/positron; 8 - tau lepton

Visualise OPERA event

OPERA
OPERA electronic detectors (ED) display
Event: 11172035775, Jun 21, 2011, 15:45 (UTC), ED: TOP VIEW Z (cm)X (cm)-800-600-400-20002004006008001,000-400-300-200-1000100200300400
Event: 11172035775, Jun 21, 2011, 15:45 (UTC), ED: SIDE VIEW Z (cm)Y (cm)-800-600-400-20002004006008001,000-400-300-200-1000100200300400
OPERA lead-emulsion detectors (ECC) display
Event: 11172035775, Jun 21, 2011, 15:45 (UTC), Tracks reconstructed in emulsion

Demobbed-viewer help

Demobbed-viewer is a JavaScript application developed for the CERN Open Data Portal. The application is supposed to visualise neutrino interaction events registered in the OPERA experiment.

At present OPERA open data sample includes four sub-samples (a sub-sample to display can be specified in the left part of the toolbar):

     - the "nuTau" sub-sample (Electronic detector data + Emulsion data) includes 10 tau neutrino candidate events observed by OPERA in the CNGS neutrino beam.

     - the "nuMu" sub-sample (Electronic detector data + Emulsion data) includes 817 events used in the study of charged hadron multiplicities in charged-current neutrino-lead interactions in the OPERA detector.

     - the "nuE" sub-sample (Electronic detector data + Emulsion data) includes 19 electron neutrino candidate events registered in the OPERA detector.

     - the "charm" sub-sample (Electronic detector data + Emulsion data) includes 50 charm decay candidate events registered in the OPERA detector.

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 the unit of OPERA target (lead-emulsion or ECC brick) that most probably contained the neutrino interaction vertex was extracted from the detector and its emulsion data were 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 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 ED display camera views, correspondingly, up, down, left, and right.

The ECC display view can be rotated or moved with help of the left or right mouse buttons, correspondingly.

, , or - show the default XZ, YZ, or XY view of the event in the ECC display.

/ - stretch/compress the ECC view in the vertical (Y) direction.

- start/accelerate animated rotation of the ECC event around the Y (vertical) axis. This button can be clicked several (but not so many!) times.

- decelerate animated rotation of the ECC event. In order to stop the rotation this button has to be clicked the same number of times as the "accelerating" button has been clicked before.

About

Demobbed-viewer v3.0

A browser-based event display for visualisation of open data of the OPERA experiment.

This application uses d3.js and three.js libraries. The code is available on the GitHub repository.

Questions/comments/problems

Contributors: S. Dmitrievsky (JINR, Dubna, Russia), G. Tsanaktsidis (CERN, Geneva, Switzerland), M. Vidal (CERN, Geneva, Switzerland).

How can you use these data?

These OPERA event data files can be visualised using the online OPERA event display

Visualise OPERA detector event 11172035775


      

Files and indexes

FilenameSize
11172035775_EventInfo.csv83.0 bytes Download
11172035775_FilteredDTHitsXZ.csv20.0 bytes Download
11172035775_FilteredRPCHitsXZ.csv19.0 bytes Download
11172035775_FilteredRPCHitsYZ.csv19.0 bytes Download
11172035775_FilteredTTHitsXZ.csv1.6 KiB Download
«⟨123⟩»

Disclaimer

These open data are released under the Creative Commons Zero v1.0 Universal license.

Logo CC0-1.0

Neither the experiment(s) ( OPERA ) nor CERN endorse any works, scientific or otherwise, produced using these data.

This release has a unique DOI that you are requested to cite in any applications or publications.

ALICE experiment
ATLAS experiment
CMS experiment
DELPHI experiment
LHCb experiment
OPERA experiment
PHENIX experiment
TOTEM experiment
© CERN, 2014–2025 ·
Terms of Use ·
Privacy Policy ·
Help ·
GitHub ·
Twitter ·
Email
Powered by Invenio
Open Data Portal v0.4.6
CERN