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Study of double hypernuclei with a general scan Kyoto University Department of Physics Toshinao Tsunemi Masashi Hayata(Kyoto Univ.) Ken-ichi Imai (Kyoto.

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Presentation on theme: "Study of double hypernuclei with a general scan Kyoto University Department of Physics Toshinao Tsunemi Masashi Hayata(Kyoto Univ.) Ken-ichi Imai (Kyoto."— Presentation transcript:

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.


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