1. Study of double hypernuclei with 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.)

2. outline KEK-E373 emulsion image scan by human brain Neural network on a computer Simplify the recognized lines Summary

3. KEK-E373

4. There are more events NAGARA event 1) Online trigger efficiency 2) Other decay channel (neutral particle) A couple of dozen double hypernuclear events in the emulsions of KEK-E373 If we can establish a general scan, we can find a couple of dozen double hypernuclear events.

5. New microscope CCD 1 M pixels Shutter 100 Hz LED light Depth of field 5  m

6. 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.

7. Photo from CCD of the microscope How our brain works? 440 pixel 512 pixel

8. Human brain Picture is cited from

9. Human brain Picture is cited from ■is related to the first stage of visual sense

10. line recognition with a neural network on a computer 512 pixel 440 pixel 32 pixel Neural network 14 line types Scan a picture by 32pixel * 32pixel region

11. 1024 16 14 0 1234 567 89 1011 input Neural network （ perceptron ） Input layer 32*32 pixel=1024 Hidden layer 16 Output layer 14 Learning with a teacher （ Back Propagation method ） 1213 Learning stage

12. 1024 16 14 output Neural network （ perceptron ） Input layer 32*32 pixel=1024 Hidden layer 16 Output layer 14 Learning with a teacher （ Back Propagation method ） 0 1234 567 89 1011 1213 image 32px output stage

13. x160 y360 out: 0 1.4795e-005 out: 1 2.75203e-007 out: 2 0.000210363 out: 3 0.00443625 out: 4 0.0644443 out: 5 0.267729 out: 6 1.06818e-005 out: 7 4.04745e-006 out: 8 5.06837e-005 out: 9 0.00151709 out: 10 0.00128184 out: 11 0.101609 out: 12 0.000494124 out: 13 0.00069409 x240 y120 out: 0 8.49013e-005 out: 1 8.02295e-008 out: 2 0.000253557 out: 3 0.00104015 out: 4 0.00361907 out: 5 0.00362555 out: 6 0.00954602 out: 7 8.22062e-005 out: 8 2.11628e-005 out: 9 0.325218 out: 10 0.0111719 out: 11 4.35869e-006 out: 12 0.00043366 out: 13 0.000240392 x376 y248 out: 0 0.0592193 out: 1 0.00778189 out: 2 0.000285482 out: 3 1.36718e-006 out: 4 4.66565e-005 out: 5 3.8341e-006 out: 6 7.36192e-006 out: 7 0.0271225 out: 8 0.00216796 out: 9 2.48886e-005 out: 10 0.000181834 out: 11 0.00517701 out: 12 0.000111058 out: 13 0.0130495 input Pattern 5 Pattern 9 Pattern 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14

14. Result of pattern match

15. simplify Successive lines with same decline are to be a line.

16. Future plan Reconstruction of lines in 3 dimensional space

17. summary A couple of dozen hypernuclear events are in the emulsion of the KEK-E373. Method of a general scan is developing.