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Summary and Outlook

Summary and Outlook. Supplement. Xin-Nian Wang (LBNL). RBRC workshop on jet correlations. Energy dependence of jet quenching Azimuthal angle dependence of jet quenching Hadrons correlations in jets Dihadron fragmentation function Jet cone structure Heavy quark energy loss

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Summary and Outlook

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  1. Summary and Outlook Supplement Xin-Nian Wang (LBNL) RBRC workshop on jet correlations • Energy dependence of jet quenching • Azimuthal angle dependence of jet quenching • Hadrons correlations in jets • Dihadron fragmentation function • Jet cone structure • Heavy quark energy loss • Future of jet quenching March 11, 2005

  2. From Theoretical Prediction Phys. Rev. Lett. 68, 1480 (1992) XNW and M. Gyulassy Gluon Shadowing and Jet Quenching in A+A Collisions at \sqrt{s}=200 AGeV

  3. To the first hints of jet quenching

  4. To explicit jet quenching Pedestal&flow subtracted

  5. And medium modification W. Holtzman F. Wang

  6. Theoretical development • Bjorken (82): elastic energy loss • Gyulassy & XNW (94) radiative energy loss • Zakharov (96), Baier et al (97) • Gyulassy-Levai-Vitev (00);Wiedemann (01); Guo-Wang (01) The field has matured. But do we understand what is really going on ?

  7. Suppression of spectra at 63 GeV Less suppression but Similar to 200 GeV as predicted given no new physics happening: XNW Vitev Adil & Gyulassy

  8. Energy Dependence of quenching D. d’Enterria, Hard Probes 2004 63 GeV

  9. Effect of non-Abelian energy loss Eskola Honkanen Salgado Wiedemann Qun Wang & XNW nucl-th/0410079 DEg=DEq DEg=2DEq

  10. Effect of non-Abelian energy loss D. d’Enterria, Hard Probes 2004

  11. Reaction plane dependence of away-side

  12. Reaction plane dependence of R_AA Df = 90° Df = 0° B. Cole, Hard Probes 2004

  13. Hadron Correlations in jets Hadron-trigger fragmentation function: XNW, Phys. Lett. B579:299-308,2004 Away-side correlation: Modification of single hadron distribution inside a jet

  14. Effect of radiated gluons Fragmentation of Gluon with a few GeV energy? Other medium Effects?

  15. Abnormal angular distribution

  16. Sonic Boom Casalderrey-Solana, Shuryak and Teaney Dumitru Linearize disturbance qM Trigger • Can hydro equation be applied to a few particles? • (2) Transverse expansion?

  17. Background, background, … C. Gagliardi Pedestal

  18. The Devil is in the details Voloshin Ying Guo Background subtraction Small number of particles!

  19. Angular distribution of radiative gluons Induced Bremsstrahlung: Vitev Radiation in vacuum Further interaction of the radiated gluons with the medium?

  20. What about DIS e+A? e- Jet quenching observed pT broadening of leading hadron or suppression of low pt hadrons: Dominance of leading hadrons from the jet with reduced energy Usefulness of dihadron distribution (fragmentation)

  21. Di-hadron fragmentation function h1 h2 jet Majumder

  22. Modification of the dihadron distribution STAR preliminary Pedestal&flow subtracted

  23. Parton recombination Hwa; Fries Particle or parton correlations are not trivial

  24. Parton recombination revisited h h 1-x’ 1-x x x’ q-qbar distribution in a jet Hwa & Yang

  25. Modification due to recombination Majumder, E.Wang & XNW’04 Hwa &Yang Fries et al Greco&Ko h Single quark distribution 2-quark distribution

  26. Future of Jet quenching STAR preliminary STAR preliminary g+jet correlation in Au+Au in run4? More accurate determination of initial Et

  27. Modification for Heavy Quarks (1) Slow clock for formation time (2) Color factor (3) Dead cone effect DEQ<DEg, DEq Djordjevic & Gyulassy Zhang & XNW Armesto,Dainese, Salgado & Wiedemann Zhang & XNW

  28. Charm quark Large charm quark Suppression? Hadronic scattering?

  29. Light-heavy quark correlation • Charm quark as a trigger: • Distribution of radiative gluons • Sonic boom associated with a large pt charm quark • Jet physics at LHC: abundant

  30. Summary • Beginning of jet tomography study • Details of modified fragmentation • Heavy quark fragmentation • Dihadron fragmentation • Jet-gamma events

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