1. 2007’ HIM@Korea-University One classical method - Multiplicity in N-N collisions at SPS/CERN J.T.RheeKonkuk-University

2. 2007’ HIM@Korea-University One classical method – Multiplicity in N-N collisions at SPS/CERN / J.T.Rhee Content 1.Introduction N-N Collisions and Lund MC FRITIOF 2.Nuclear Emulsion and EMU 01 Collaboration 3. Experiment 4. Long range correlation Forward and Backward Correlation 5. Discussion

3. 2007’ HIM@Korea-University One classical method of Heavy Ion Physics – Multiplicity in collisions at SPS/CERN / J.T.Rhee Introduction N-N Collisions and Lund MC FRITIOF Au + Au, 200AGeV Pb + Pb, 160AGeV

4. 2007’ HIM@Korea-University One classical method – Multiplicity in N-N collisions at SPS/CERN / J.T.Rhee Nuclear Emulsion

5. 2007’ HIM@Korea-University One classical method – Multiplicity in N-N collisions at SPS/CERN / J.T.Rhee Experimental set-up & Measuring device

6. 2007’ HIM@Korea-University One classical method – Multiplicity in N-N collisions at SPS/CERN / J.T.Rhee Stack events by H.H.Heckman Chamber vs Stack 2 Types of Emulsion detectors

7. 2007’ HIM@Korea-University One classical method – Multiplicity in N-N collisions at SPS/CERN / J.T.Rhee Nuclear Emulsion Chamber (in EMU 01 Collaboration)

8. 2007’ HIM@Korea-University One classical method – Multiplicity in N-N collisions at SPS/CERN / J.T.Rhee

9. 2007’ HIM@Korea-University One classical method – Multiplicity in N-N collisions at SPS/CERN / J.T.Rhee Track geometry & Reconstruction

10. 2007’ HIM@Korea-University One classical method – Multiplicity in N-N collisions at SPS/CERN / J.T.Rhee Kinematic variables Pseudorapidity vs Rapidity Rapidity y = 1/2 ln (E+P Z /E-P Z ) Pseudorapidity  = - ln (tan  /2)

11. 2007’ HIM@Korea-University One classical method – Multiplicity in N-N collisions at SPS/CERN / J.T.Rhee

12. 2007’ HIM@Korea-University One classical method – Multiplicity in N-N collisions at SPS/CERN / J.T.Rhee

13. 2007’ HIM@Korea-University One classical method – Multiplicity in N-N collisions at SPS/CERN / J.T.Rhee

14. 2007’ HIM@Korea-University One classical method – Multiplicity in N-N collisions at SPS/CERN / J.T.Rhee Entropy and Relative entropy

15. 2007’ HIM@Korea-University One classical method – Multiplicity in N-N collisions at SPS/CERN / J.T.Rhee Relative Entropy Data base

16. 2007’ HIM@Korea-University One classical method – Multiplicity in N-N collisions at SPS/CERN / J.T.Rhee Relative Entropy

17. Long range correlation Consideration of particles in Forward and Backward window gaps

18. 2007’ HIM@Korea-University One classical method – Multiplicity in N-N collisions at SPS/CERN / J.T.Rhee Gaps between Forward & Backward -Pseudorapidity windows Long range correlation

19. 2007’ HIM@Korea-University One classical method – Multiplicity in N-N collisions at SPS/CERN / J.T.Rhee Entropy without Rapidity Gaps

20. 2007’ HIM@Korea-University One classical method – Multiplicity in N-N collisions at SPS/CERN / J.T.Rhee Entropy with Rapidity Gaps

21. Discussion

22. 2007’ HIM@Korea-University One classical method – Multiplicity in N-N collisions at SPS/CERN / J.T.Rhee Discussion in the Central & Fragmentation Region

23. 2007’ HIM@Korea-University One classical method – Multiplicity in N-N collisions at SPS/CERN / J.T.Rhee Relative entropy analysis Long-range correlations Both in full phase space and in different symmetric pseudorapidity windows R is insensitive to energy R increses with the scaled window size and tends to saturate Compare to Oxygen and Sulpher induced unbiased interactions with emulsion, a faster saturation of R is found in central Sulpher-Gold collisions Analyzing without gap: I r increases with the size of the scaled windows and shows clearly energy dependence. Analyzing with gaps: I r decreases with the gap size between the forward and backward pseudorapidity windows.

24. 2007’ HIM@Korea-University One classical method – Multiplicity in N-N collisions at SPS/CERN / J.T.Rhee (And again one day is finished, and again is produced Bull Sheet only. Good Night, sleep well you troubles, lick on my Ass till the morning! – And …)

25. 2007’ HIM@Korea-University One classical method – Multiplicity in N-N collisions at SPS/CERN / J.T.Rhee BUT… Thank you and have a good day!!! ^^

26. “compact” cell The cell : detection of the primary and of the secondary vertex(OPERA) Lead ®  large M target Lead ®  large M target Emulsion sheets (ES) Emulsion sheets (ES) ® tracking in space ® tracking in space Each (double-sided) ES Each (double-sided) ES - 50  m emulsion layers on both side s of 200  m plastic base 200  m plastic base -  m detection granularity ® high quality track segments ® high quality track segments  decays downstream of the  decays downstream of the vertex lead plate vertex lead plate ® observation of decay kink ® observation of decay kink (not simply impact parameter) (not simply impact parameter) Emulsion “grains”  track segment PbES  Pb e,    decay “kink” e ,   50 200 50 (  m) 1 mm

27. 2007’ HIM@Korea-University One classical method – Multiplicity in N-N collisions at SPS/CERN / J.T.Rhee