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OPERA tau neutrino candidate event 11213015702

OPERA tau neutrino candidate event 11213015702, OPERA collaboration

Cite as: OPERA collaboration (2018). OPERA tau neutrino candidate event 11213015702. CERN Open Data Portal. DOI:10.7483/OPENDATA.OPERA.22SX.FRE7

Dataset Derived OPERA CERN-SPS


Description

This ${\nu_\tau}$ interaction occurred on August 1$^{st}$ 2011 in the second super-module, in the $15^{th}$ wall, 16 walls upstream of the muon spectrometer. 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 $\tan\theta=3$.

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.

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. All other tracks were classified as hadrons using their overall track length and the correlation between their momentum and range. The neutrino energy was measured to be $6.8$~GeV/c.

This event was thus interpreted as a $\nu_{\tau}$ charged-current interaction with the $\tau$ lepton decaying into three hadrons.

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. 9.4 kB in total.

Dataset semantics

Variable 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

How can you use these data?

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

Visualise OPERA detector event 11213015702

File Indexes

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Disclaimer

The open data are released under the Creative Commons CC0 waiver. Neither OPERA nor CERN endorse any works, scientific or otherwise, produced using these data. All releases will have a unique DOI that you are requested to cite in any applications or publications.

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