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

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Presentation on theme: "Jet Discovery of Jet Quenching and Beyond Xin-Nian Wang LBNL, June 29, 05."— Presentation transcript:

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

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

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

4 A Chronicle of Jet Quenching 1982, Bjorken (unpublished): elastic dE/dx too small 1990,Gyulassy, Pluemer: Evoking inelastic dE/dx 1992, Gyulassy, XNW: Suppression of leading hadrons due to jet quenching 1994,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 p T v 2 due to jet quenching 2002: Suppression of high p T hadron in Au+Au 2003: v 2 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 p T 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 Gluon Shadowing and Jet Quenching in A+A Collisions at \sqrt{s}=200 AGeV XNW and M. GyulassyPhys. Rev. Lett. 68, 1480 (1992) ETET

8 Away-side suppression or Mono-jet

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

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 Modified splitting functions Guo & XNW’00 e-e-

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

14 Single spectra in A+A collisions Participant Density Single spectra Dihadron 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) Color dipole model Kopeliovich et al (02) Alberto Accardi (01) Wang&Wang 2001

16 Single hadron suppression

17 Suppression of away-side jet

18 Azimuthal Anisotropy Single hadron Intermediate p T : effects of parton coalescence

19 Partonic Energy Loss at RHIC E=10 GeV Gyulassy & Vitev; Barnafoldi et al Muller Jeon et al 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 Eg=EqEg=Eq  E g =2  E q Qun Wang & XNW ‘04

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

23 Beyond the discovery III: Measuring Parton Energy Loss ETET p T trig

24 STAR preliminary Beyond the discovery V: Mod. FF

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

28

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