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Hadron Correlation in Jets in Heavy Ion Collisions

Hadron Correlation in Jets in Heavy Ion Collisions. C.B. Yang Collaborated with R.C. Hwa. arXiv:0812.2205 Phys. Rev. C79, 044908 (2009). Outline. QGP formation and jet quenching Interactions between jets and medium Correlations in jets Recombination model considerations

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Hadron Correlation in Jets in Heavy Ion Collisions

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  1. Hadron Correlation in Jets inHeavy Ion Collisions C.B. Yang Collaborated with R.C. Hwa arXiv:0812.2205 Phys. Rev. C79, 044908 (2009)

  2. Outline • QGP formation and jet quenching • Interactions between jets and medium • Correlations in jets • Recombination model considerations • Correlations in Re/Co model • Results • Discussions

  3. QGP formation and jet quenching PHENIX

  4. STAR

  5. v2 scaling Chunbin Yang

  6. Interactions between jets and medium Jets influenced by medium Medium influenced by jets? Near side: ridge Away side: double bump

  7. dividing the away-side jet function into equal-sized head (|φ − π| < π/6, HR) and shoulder (π/6 < |φ − π| <π/2, SR) regions, as indicated in (c).

  8. Pt>4 GeV/c

  9. Recombination models • Hadrons formed by combining two (three) constituent quarks • Combining probabilities, determined by wave functions, called the recombination functions • There are soft and hard partons • Hard parton will lose energy in traversing the medium • Hard partons evolve into semi-hard showers

  10. Relevant partonic and hadronic variables Position of hard scattering can be different Hard momentum k=k’ fluctuates

  11. Degraded parton distribution with fixed length L Only parameter L

  12. Upper and lower limits in the integration correspond to t=0 and L

  13. Fix the parameter L=2.9

  14. Near side

  15. Away side

  16. Dependence on system size and momenta

  17. Centrality dependence Determine =L distribution for each centrality Not a geometrical problem No first principle can be used

  18. Away side jet (special case)

  19. L=2.9

  20. L=2.9

  21. Near side jet (general case)

  22. Away side jet (general case)

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