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An Example of e-Science: High Energy Physics

An Example of e-Science: High Energy Physics. Dongchul Son Center for High Energy Physics Kyungpook National University 16th APAN Meetings / Advanced Network Conference Aug. 27, 2003, Busan, KOREA. Contents. Introduction of HEP research Why is HEP Data Grid needed?

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An Example of e-Science: High Energy Physics

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  1. An Example of e-Science:High Energy Physics Dongchul Son Center for High Energy Physics Kyungpook National University 16th APAN Meetings / Advanced Network Conference Aug. 27, 2003, Busan, KOREA

  2. Contents • Introduction of HEP research • Why is HEP Data Grid needed? • HEP Data Grid in shape and its future • Introduction of Korean HEP Activity • Conclusion

  3. Goal Understanding ultimate structure of matter and origin of the universe

  4. Early Data Analysis • Example: Bubble Chamber pictures (Fifties to Seventies) • Scanning (finding an interesting events) • Measuring (tracks on the film to digital form) • Track reconstruction in space (with help of computers) • Kinematics fitting and analysis of the property of interactions •  Data Storage Tape (Portable)

  5. Early Data Analysis • Difficulties • Interactions became very complex (hundreds of particles to distinguish) • So many pictures to analyze (~ millions of pictures) •  Needed automatic computerized procedure • It still took so long time to process data to publication • Overcome (in the Seventies) • Film Pictures (Analog form)  Electronic Signals from Detectors (New types of Detectors: MWPC etc.) • Analog but easily digitized with ADC (or TDC) • Fast signal processing ( kHz or MHz ) • On-line processing • Track reconstruction in space (with help of computers) • Kinematics fitting and analysis of the property of interactions)  Data Storage Tape

  6. Later…

  7. Later…

  8. Later…. very complex

  9. Drift Chamber Geiger Müller Counter to MWPC Counters and Wire Chambers Charged particles Charged particles

  10. channels Analog Digital Super Computers Data Flow and Reduction I I Q Q Millions of t t Detectors

  11. Typical Research Procedure Remote-sites (participating institutions) Data Analysis HEP Knowledge Reaction Simulation = Event Generation Detector Simulation Simulated Data Data Reduction Real Data On-sites (Experimental sites)

  12. For better form of communication among physicists, the first WWW browser from CERN was born

  13. n q Matter and anti-matter e- e+ • electron • positron n • anti-neutrino • neutrino q • quark • anti-quark

  14. H d u u u u d Hydrogen Atom vs Anti-Hydrogen Atom H e- electron e+ positron Proton anti-proton

  15. n n matter + antimatter = ? Virtual Light Z boson e- e+ Or They are being transformed to energy, then particles are created. When high energy particles collide, new particles may appear. 전자 + 양전자 = 빛 또는 Z 보존

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