General Scan for DoubleHypernucleus

1
General Scan for Double-Hypernucleus

• HAYATA, Masashi
• Kyoto Univ.
• 2006.9.22, JPS Meeting

2
Index

• Double-hypernucleus Search
• Algorithm of General Scan
• Summary

3
Double-hypernucleus Search

• Nucleus with S-2 (LLX, LSX, SSX, XX, HX)
• Research for Nuclear Structure,
• Hyperon-Hyperon Interaction, H-Dibaryon
• Short Range Decay Particles gtgt Emulsion
• Too Rare Event gtgt Hybrid-Emulsion (Limit by
  others)

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Detectable Stopped X- by Hybrid-Emulsion
of E373_at_KEK
Detector Acceptance 50
p(K-,K)X-
p(K-,K)X- n(K-,K0)X- 2050
1.66GeV/c K-
Detection Efficiency 30
X- in Target 65
Detectable X- 25
N(K-,K0)XLL ??
5
Algorithm of General Scan

• Try all possibility
• Hough Transform (Nagoya Univ.)
• Pattern Matching_at_Neural Network
• (Tsunemi _at_ Kyoto Univ.)
• Huge Calculation, Simple Operation
• gtgt Hardware Easy, Effective SIMD Processing
• Select hopefuls
• Figure Parameter Cut (Hayata _at_ Kyoto Univ.)
• Smaller Calculation, Complex Operation

6
Flowchart of General Scan
Grayscale Image
Convexity Cut
Sum and Binarize
Different Sum and Binarize
Convexity Cut
Vertex Identify
Eye Scan
Double hypernucleus
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Binarize with Maximum Method
Normal Binarize
Grayscale
Local Maximum
Grayscale
Normal Binarize
Grayscale
Local Maximum
Relative Grayscale
Relative Binarize
Relative Binarize
Relative Grayscale
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Figure Parameter Cut

• Grayscale Image
• Binarize Image
• Area, Perimeter,
• Figure Parameter Cut
• Convexity S / Sh
• Circle, Square, 1
• Vertex-Like ltlt 1

Sh
S
S
Convexity 1
Convexity 0.55
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Test of Figure Parameter Cut

• This test is to Biased Samples
• So I will test to more samples

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Summary and To Do

• General Scan can detect all LLX
• while Hybrid-Emulsion detects limited LLX
• We try General Scan for search of LLX
• To-do for next JPS Meeting
• Build up Sum-up Algorithm and Convexity Cut
• More Statistics for Algorithm Study
• Other To-do List
• Build 2nd Cut Algorithm (Hough Transform?)
• Estimate Efficiency (Compare to eye-scan?)
• Improve Microscope System

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Appendix
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Double-hypernucleus Events
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Cross section of K-p -gt KX-, K-n -gt K0X-

• If I(1) double K exchange or S resonance only,
• s1(K-n -gt K0X-) / s0(K-p -gt KX-) 4
• If I(0) L resonance, K-p is enhanced
• K-n-gtKX-, P1510, s1/22026

Phys. Rev. 147 p945
Phys. Rev. 179 p1262
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Hough Transform for Line

• r x cosq y sinq
• Non Infinite and Uniform

r x cosq y sinq
0ltrlt(X2Y2)1/2, 0ltqltp
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Evade Interlace and Binarize

• Refer even/odd line only when Binarize
• Binarize Method
• Simple Threshold
• Simple Mean
• Gaussian Weighted Mean
• Median
• Minimum/Maximum

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Light Adjust and Optimize Contrast
Shallow
Shallow
Deep
Deep
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Convexity Plot
Vertex Like
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Microscope System

• Standard System
• 100Hz CCD Camera
• 25x25cm2 Emulsion
• If x20 Lens and 5mm pitch for z
• gtgt 7day/emulsion
• Enable to analyze,
• but want Fast CCD
• and more Microscopes

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History of Image Processing
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Result of Figure Parameter Cut