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Jet

Discovery of Jet Quenching and Beyond. Jet. Xin-Nian Wang LBNL, June 29, 05. Discovery of Jet Quenching and Beyond. The 59 th Eastern Forum on Science and Technology. Shanghai, June 28-29, 2005. Introduction: A brief history Jet quenching pattern and implications

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Jet

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  1. Discovery of Jet Quenching and Beyond Jet Xin-Nian Wang LBNL, June 29, 05

  2. Discovery of Jet Quenching and Beyond The 59th Eastern Forum on Science and Technology Shanghai, June 28-29, 2005 • Introduction: A brief history • Jet quenching pattern and implications • Beyond the discovery of jet quenching Xin-Nian Wang (LBNL)

  3. Jet Tomography QCD Response: Quark scattering Dynamic System: Photon or dilepton emission J/Y suppression

  4. A Chronicle of Jet Quenching • 1982, Bjorken (unpublished): elastic dE/dx too small • 1990,Gyulassy, Pluemer: Evoking inelastic dE/dx • 1992, Gyulassy, XNW: Suppression of leading hadrons due to jet quenching • 1994, Gyulassy, XNW: First calculation of radiative parton energy loss with LPM • 1995, Gyulassy, Pluemer, XNW: Estimate of mono-jet rate in AA at RHIC • 1996, Huang, Sarcevic, XNW: Medium modified fragmentation function & gamma tagged jet quenching • 1996, Zakharov: Path integral formulation of dE/dx • 1997, Baier et al: non-abelian LPM in QCD- interaction with gluonic clouds

  5. A Chronicle- Con’ d • 2000, XNW: First estimate of Cronin at RHIC • 2000, Gyulassy, Levai, Vitev: Opacity expansion I. • 2001, Wiedemann: Opacity expansion II • 2001, Guo, XNW: Higher-Twist expansion and calculation of modified frag. function. • 2001, XNW, GVW: high pT v2 due to jet quenching • 2002: Suppression of high pT hadron in Au+Au • 2003: v2 at high pt observed • 2003: Suppression of back-side jet • 2003, June 18: d+Au results announced • 2004, azimuthal dependence of away-side jet • 2005, angular correlations within jets

  6. Jet Quenching • Jet Quenching – Suppression of high pT jet in dense medium • Experimentally: • Medium modification of jet fragmentation function (FF) • Suppression of the leading hadrons in FF • Theoretically: • Parton energy loss before hadronization • Or absorption of leading hadrons from jets

  7. Single Spectra Suppression Phys. Rev. Lett. 68, 1480 (1992) XNW and M. Gyulassy Gluon Shadowing and Jet Quenching in A+A Collisions at \sqrt{s}=200 AGeV ET

  8. Away-side suppression or Mono-jet

  9. Azimuthal Anisotropy Phys. Rev. C 63, 054902 (2001) XNW Jet Quenching and Azimuthal Anisotropy of Large pT Spectra in Non-central High-energy Heavy-ion Collisions

  10. Non-suppression in p+A Systematic study of high p(T) hadron spectra in p p, p A and A A collisions from SPS to RHIC energies Phys. Rev. C 61, 064910 (2000) hep-ph/9812021, XNW

  11. Experimental Evidence

  12. Modified Fragmentation Function e- Modified splitting functions Guo & XNW’00

  13. Energy Loss BDPM Gyulassy Vitev Levai Wang & Wang Wiedemann; Zakharov Quark energy loss = energy carried by radiated gluon Two-parton correlation:

  14. Single spectra in A+A collisions Dihadron spectra Participant Density Single spectra

  15. Nuclear Modification Factor Initial state effect: Shadowing & pt broadening: XNW, PRC61(00)064910 Fai, Papp, and Levai (02) Vitev & Gyulassy (02) Vitev (03) Alberto Accardi (01) Color dipole model Kopeliovich et al (02) Wang&Wang 2001

  16. Single hadron suppression

  17. Suppression of away-side jet

  18. Azimuthal Anisotropy Single hadron Intermediate pT: effects of parton coalescence

  19. Partonic Energy Loss at RHIC Gyulassy & Vitev; Barnafoldi et al Muller Jeon et al E=10 GeV Enke Wang & XNW’2000

  20. Beyond the discovery I: Energy Dependence of quenching D. d’Enterria, Hard Probes 2004 63 GeV

  21. Effect of non-Abelian energy loss Qun Wang & XNW ‘04 DEg=DEq DEg=2DEq

  22. Beyond the Discovery II STAR preliminary 20-60% 20-60% dihadron Azimuthal Mapping of jet quenching

  23. Beyond the discovery III: Measuring Parton Energy Loss ET pTtrig

  24. Beyond the discovery V: Mod. FF STAR preliminary STAR preliminary

  25. Beyond the discovery IV: Abnormal angular distribution

  26. Summary • Discovery of Jet Quenching proves that dense matter is formed • Jet quenching is caused by partonic energy loss • Dense matter at RHIC is 30 times higher than cold nuclei • The matter is strongly interactive • Jet tomography become useful and power tool for studying properties of dense matter

  27. Theoretical work in China • Enke Wang, Benwei Zhang, Hanzhong Zhang, W.C. Xiang etc (IOPP, Wuhan) • S.Y. Li, Z.G. Shi (Shandong Univ.) • Qun Wang (USTC) Collaboration with experimental groups

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