General Scan for DoubleHypernucleus - PowerPoint PPT Presentation

Title: 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)

4
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
7
Binarize with Maximum Method
Normal Binarize
Grayscale
Local Maximum
Grayscale
Normal Binarize
Grayscale
Local Maximum
Relative Grayscale
Relative Binarize
Relative Binarize
Relative Grayscale
8
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
9
Test of Figure Parameter Cut

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

10
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

11
Appendix
12
Double-hypernucleus Events
13
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
14
Hough Transform for Line

• r x cosq y sinq
• Non Infinite and Uniform

r x cosq y sinq
0ltrlt(X2Y2)1/2, 0ltqltp
15
Evade Interlace and Binarize

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

16
Light Adjust and Optimize Contrast
Shallow
Shallow
Deep
Deep
17
Convexity Plot
Vertex Like
18
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

19
History of Image Processing
20
Result of Figure Parameter Cut