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Study of double hypernucleiwith a general scan
Kyoto University
Department of Physics
Toshinao Tsunemi
Masashi Hayata(Kyoto Univ.) Ken-ichi Imai (Kyoto Univ)Kazuma Nakazawa(Gifu Univ.) Takaomi Watanabe(Gifu Univ.)
outline
• KEK-E373 emulsion
• image scan by human brain
• Neural network on a computer
• Simplify the recognized lines
• Summary
KEK-E373
There are more eventsNAGARA event
1) Online trigger efficiency2) Other decay channel (neutral particle)
A couple of dozendouble hypernuclear eventsin the emulsions of KEK-E373
If we can establish a general scan, we canfind a couple of dozen double hypernuclear events.
New microscope
CCD 1 M pixelsShutter 100 HzLED light
Depth of field 5m
Recognize a line
• There is a vertex in a double hyper or single hypernuclear event
Recognize a line
Reconstruct a vertex
We are working on recognizing a line now.
Photo from CCD of the microscope
How our brain works?
44
0 p
ixe
l
512 pixel
Human brain
Picture is cited from
Human brain
Picture is cited from
■is related to the first stage of visual sense
line recognition with a neural networkon a computer
512 pixel
440
pixe
l
32 pixel
Neural network
14 line types
Scan a picture by32pixel * 32pixel region
1024
16
140 1 2 3 4
5 6 7 8 9
10 11
input
Neural network ( perceptron )
Input layer 32*32 pixel=1024Hidden layer 16Output layer 14
Learning with a teacher ( Back Propagation method)
12 13
Learning stage
1024
16
14
output
Neural network ( perceptron )
Input layer 32*32 pixel=1024Hidden layer 16Output layer 14
Learning with a teacher ( Back Propagation method)
0 1 2 3 4
5 6 7 8 9
10 11 12 13
image
32px
32
px
output stage
x160 y360out: 0 1.4795e-005out: 1 2.75203e-007out: 2 0.000210363out: 3 0.00443625out: 4 0.0644443out: 5 0.267729out: 6 1.06818e-005out: 7 4.04745e-006out: 8 5.06837e-005out: 9 0.00151709out: 10 0.00128184out: 11 0.101609out: 12 0.000494124out: 13 0.00069409
x240 y120out: 0 8.49013e-005out: 1 8.02295e-008out: 2 0.000253557out: 3 0.00104015out: 4 0.00361907out: 5 0.00362555out: 6 0.00954602out: 7 8.22062e-005out: 8 2.11628e-005out: 9 0.325218out: 10 0.0111719out: 11 4.35869e-006out: 12 0.00043366out: 13 0.000240392
x376 y248out: 0 0.0592193out: 1 0.00778189out: 2 0.000285482out: 3 1.36718e-006out: 4 4.66565e-005out: 5 3.8341e-006out: 6 7.36192e-006out: 7 0.0271225out: 8 0.00216796out: 9 2.48886e-005out: 10 0.000181834out: 11 0.00517701out: 12 0.000111058out: 13 0.0130495
input
Pattern 5
Pattern 9
Pattern 0
1
2
3
4
5
6
7
89
10
11
12
13
14
Result of pattern match
simplify
Successive lines with same decline are to be a line.
Future plan
Reconstruction of lines in 3 dimensional space
summary
• A couple of dozen hypernuclear events are in the emulsion of the KEK-E373.
• Method of a general scan is developing.