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OPERA tau neutrino candidate event 9190097972

OPERA tau neutrino candidate event 9190097972, OPERA collaboration

Cite as: OPERA collaboration (2018). OPERA tau neutrino candidate event 9190097972. CERN Open Data Portal. DOI:10.7483/OPENDATA.OPERA.GF54.99LC

Dataset Derived OPERA CERN-SPS


Description

This ${\nu_\tau}$ interaction occurred on July 9$^{th}$ 2009 in the first super-module, in the $25^{th}$ wall. 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 $\tan\theta=3$.

After the analysis of the interface emulsion films, 5 tracks were found showing a converging path. This finding triggered the brick film development. By the scan-back procedure, the neutrino interaction was located in the lead layer between the $35^{st}$ and $36^{nd}$ emulsion films.

The neutrino interaction vertex consists of five charged tracks. From the analysis of their impact parameters, it turned out that all tracks could not originate from the same vertex: a short decay must have occurred. Looking at the impact parameters, one of the tracks must have originated from a decay vertex occurred 10~$\mu$m upstream from the downstream face of the lead plate that contains the neutrino vertex. Since both primary and decay vertices are in the same lead plate, there are no base-tracks in emulsion associated to the $\tau$ lepton.

The flight length has been evaluated to be 822~$\mu$m, while the kink angle 146~mrad. All tracks were recognized as hadrons: two of them stopped inside the brick, the others were classified thanks to the correlation between their momentum and range. The neutrino energy was measured to be $9.6$~GeV.

This event was thus interpreted as a $\nu_{\tau}$ charged-current interaction with the $\tau$ 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. 10.3 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 9190097972

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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