umut kose neutrino interaction location in the opera experiment new development of flavor physics,...
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Umut Kose
Neutrino interaction location in the OPERA
Experiment
New Development of Flavor Physics, 10.03.2009, Tennomaru, Gamagori
Nagoya University
Vertex location method
scan back
volume scanaround VTX prediction point
(~1cm*1cm*10plates)
VTX located
volume scanaround stop plate
(~1cm*1cm*10plates)
direct VTX hunting method scan back location method
not foundVTX search
found
partner & parent search
CSD found
Decay Search
5 mm
ECC Brick (57 emulsions + 56 Pb)
CS Doublet
Scanback location Method
600micron
160
mic
ron
Track is scanned around
prediction point
Scanback location Method
5 mm
ECC Brick (57 emulsions + 56 Pb)
CS Doublet
Stopping Plate
The vertex is confirmed by scanning a volume around the stopping position;
recording all the track segments within a given angular acceptance: NetScan data taking.
The fiducial volume is 1cm2x10 films in total.
How to analyse ECC data
Track segments overlapped
At least 2-segment connected tracks
Eliminate passing through tracks
Reconstruct full vertex topology
Offline tracking and vertex
reconstruction
Summary of events:
147 neutrino interaction vertex is located in ECC bricks147 neutrino interaction vertex is located in ECC bricks
368
ECC arrived
38
in progress
VTX located
84
penetrating
101
46
Edge out
14
Stopped in ECC
25
In progress
158ScanBack
3
Failed
200
84
Direct Vertex
57
VTX located
In progress
147 events = 116 CC + 31 NC
Summary
• In total about 500 events (Europe+Japan Scanning centers) located in ECC..
• Neutrino location chains from electronic detector to ECC working well..
• OPERA neutrino interaction location and tau decay search is going on…
• The tau decay search will be introduced by the next speaker; Nonoyama…
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