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Quark Matter 2005, Budapest Xin-Nian Wang Lawrence Berkeley National Laboratory Jet and Leading Hadron Production.

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Presentation on theme: "Quark Matter 2005, Budapest Xin-Nian Wang Lawrence Berkeley National Laboratory Jet and Leading Hadron Production."— Presentation transcript:

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2 Quark Matter 2005, Budapest Xin-Nian Wang Lawrence Berkeley National Laboratory Jet and Leading Hadron Production

3 Asymptotic freedom Scale anomaly Phase transition Asymptotic Freedom and QCD David J. Gross H. David Politzer Frank Wilczek Nobel Prize in Physics 2004

4 Hard processes in heavy-ion collisions q q leading particle leading particle pQCD H. Zhang,J. Owens, E. Wang XNW, in preparation

5 Before the Beginning…

6 Single Spectra Suppression XNW and M. Gyulassy Phys. Rev. Lett. 68, 1480 (1992) ETET PHENIX

7 Non-suppression in p+A XNW, Phys. Rev. C 61, 064910 (2000) [hep-ph/9812021] PHENIX

8 Azimuthal Anisotropy XNW Phys. Rev. C 63, 054902 (2001) Gyulassy, Vitev & XNW Phys. Rev. Lett. 86, 2537 (2001) STAR

9 Suppression of Back-side Correlation Pedestal&flow subtracted STAR, Phys. Rev. Lett. 90, 082302 (2003)

10 Modified Fragmentation Guo & XNW’00 DGLAP-like

11 Parton Energy Loss and QGP Gluon density correlation: BDPM; Gyulassy Vitev Levai Wang & XNW; Wiedemann; Zakharov LPM interference

12 pQCD Analysis of Jet Quenching Parton distr. in nuclei & p T broadeningModified Frag. Fun. E. Wang & XNW (2002), XNW (2004) Gyulassy, Levai & Vitev (2002) Eskola, Honkanen, Salgado & Wiedemann (2005) Q. Wang & XNW (2005) Turbide, Gale, Jeon & Moore (2005) Dainese, Loizides & Paic (2005) …

13 Jet Quenching at RHIC XNW, PLB595(04)165. LO analysis,

14 Energy Dependence of Jet Quenching D. d’Enterria, Hard Probes 2004 63 GeV XNW, PLB579(2004)299

15 Effect of non-Abelian energy loss Eg=EqEg=Eq  E g =2  E q Q. Wang & XNW nucl-th/0410079 Effects in heavy/light hadron ratio – Armesto, parallel 3c p T =6 GeV q=0.9 0.1 Eskola Honkanen Salgado Wiedemann

16 Nuclear Size Dependence

17 Sensitivity of R AA Cronin effect Slope of the jet spectra E-dependence of the energy loss Gyulassy & Vitev Eskola,Honkanen Salgado,Wiedemann

18 Back-2-back Dihadron Correlations Pedestal&flow subtracted ETET = STAR preliminary Majestero XNW, PLB595(04)165.

19 Modified Dihadron Fragmentation h1h1 h2h2 h1h1 h2h2 h1h1 h2h2 h1h1 h2h2 jet Majumder & XNW’04,05 Majumder, parallel 3b

20 Modified Dihadron Fragmentation D(z 1,z 2 )/D(z 1 )Triggering h 1 Hermes Preliminary Majumder & XNW nucl-th/0412061 E. Wang & XNW, PRL89 (2002) 162301 Pedestal&flow subtracted Majumder, parallel 3b

21 Soft hadrons rings PHENIX Stoecker’04 Casalderrey-Solana,Shuryak & Teaney ‘04 Casalderrey-Solana (parallel 3b) MM Shock wave?

22 LPM & Angular Correlation Radiation in vacuum Formation time Multiple Scattering in QCD

23 LPM & Cherenkov-like Bremsstrahlung J. Ruppert & B. Muller PLB619(2005)123. Dremin, JETP(1979), hep-ph/0507167 Dremin (parallel 10a) Majumder & XNW nuth-0507063 Dielectric constant

24 Resonances in QGP above T c ? J/  survives at T=1.6-2 T c Asakawa &Hatsuda ’04 S. Datta, et al ‘04 F. Karsch & Laermann ‘03 Could there be other resonances? Shuryak & Zahed ‘04 Lee, Mocsy (parallel 10c); Mannarelli, Petreczky (parallel 7a)

25 Dielectric Constant in QGP     Strong p-dependence Cherenkov angle Koch, Majumder & XNW’05 See Majumder (parallel 3b)

26 Future of Jet Quenching I No-trigger bias –Initial energy –Surface emission –Correlation background due to v2 XNW, Huang & Sarcevic,PRL77(96)231  -jet Events

27 Future of Jet Quenching II Heavy quark jet quenching –Djordjevic, Rapp, Teaney (parallel 5b) –B. Zhang (parallel 5a) Parton recombination at intermediate pt –Ko (parallel 2b), Hwa (parallel 3a), E. Wang (parallel 3c) 3D jet tomography –Adil (parallel 3a) Incorporate dynamic evolution of bulk matter

28 Summary Discovery of Jet Quenching at RHIC proves that a interacting dense matter is formed: Opaque to jets Dense matter at RHIC is 30 times higher than cold nuclei, energy density is 100 times higher Jet tomography a useful and power tool for studying properties of dense matter –Heavy quarks, dihadron correlation, angular distribution, flavor dependence … Soft hadron correlation  Cherenkov radiation  dielectric property of the QGP at RHIC

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31 Back-up I

32 Jet Quenching Tomography 

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