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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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.)

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

KEK-E373

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.

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

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? 440 pixel 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 network on a computer 512 pixel 440 pixel 32 pixel Neural network 14 line types Scan a picture by 32pixel * 32pixel region

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

output Neural network （ perceptron ） Input layer 32*32 pixel=1024 Hidden layer 16 Output layer 14 Learning with a teacher （ Back Propagation method ） image 32px output stage

x160 y360 out: e-005 out: e-007 out: out: out: out: out: e-005 out: e-006 out: e-005 out: out: out: out: out: x240 y120 out: e-005 out: e-008 out: out: out: out: out: out: e-005 out: e-005 out: out: out: e-006 out: out: x376 y248 out: out: out: out: e-006 out: e-005 out: e-006 out: e-006 out: out: out: e-005 out: out: out: out: input Pattern 5 Pattern 9 Pattern

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.