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Jet Jet Tomography of Hot & Dense Matter Xin-Nian Wang LBNL, June 25, 2003.

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Presentation on theme: "Jet Jet Tomography of Hot & Dense Matter Xin-Nian Wang LBNL, June 25, 2003."— Presentation transcript:

1 Jet Jet Tomography of Hot & Dense Matter Xin-Nian Wang LBNL, June 25, 2003

2 Equation of States F. Karsch ‘2001 Hadrons: QGP: Quarks(2x3x2x2) Gluons(2x8)

3 Medium Response Function QCD Response:Quark scattering Dynamic System: Photon or dilepton emission J/  suppression ( talks by Averbeck, Sinha, Fries, Granier de Cassagnac )

4 Computed Tomography (CT) Calibrated source Absorption properties Computer assisted correction Image Jet Tomography: Using Parton Jets

5 Jets: Beams of quarks and gluons Jet Tomography Au+Au Talks by Jacobs, Bathe

6 EM Radiation EM field carried by a fast moving electron v EM Radiation by scattering: Interference between initial and final state radiation Initial rad. Final rad.

7 Electron Tomography i j Classical radiation of a point charge (Jackson, p671) Formation time

8 Two Limits Like a single scattering Factorization Limit: Bethe Heitler Limit:

9 LPM Effect Landau Pomeranchuck Migdal N coh radiation like from a single scattering N coh

10 Radiation in QCD: Colors Make the Difference pipi pfpf k a c k pipi pfpf pfpf pipi k Gluon multiple scattering (BDMP’96) y 0 QCD y 0 QED

11 DIS off Nuclei e-e- Frag. Func.

12 Parton energy loss: A twisted story e-e- Parton Energy Loss Modified frag. function

13 HERMES data in Au nuclei

14 Expanding Medium (GVW, GOW,Wiedemann) Energy loss in a static medium with density

15 Single spectra in A+A collisions pQCD Parton Model

16 Nuclear Modification Factor pA 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) LP model

17 Single hadron suppression Talks by: Hwa, Bass, Greco, Molnar

18 Di-hadron Spectra Hadron-trigger fragmentation function:

19 Suppression of away-side jet 

20 Azimuthal Anisotropy dihadron Single hadron

21 Azimuthal anisotropy II Talk by R. Lacey, S Voloshin

22 Partonic Energy Loss at RHIC GeV for E=10 GeV From RHIC data of Au+Au Collisions Initial Density about 30 times of that in a Cold Au Nucleus Consistent with estimate of initial condition Talks by Venugopalan, Bickley

23 Energy Loss Is Partonic! Could it be caused by hadronic absorption or rescattering? NO! Uncertainty principle: (1) Hadron formation time: h

24 Parton Energy Loss: 2 (2) Centrality dependence:

25 Parton energy loss: (3) (3) P T Dependence:

26 Parton Energy Loss: (4) Large v2 Geometrical anisotropy is an early phenomenon! early late

27 Parton Energy Loss: (4) (5) Same-side jet profile Same-side jet cone remains the same as in pp collision PHENIX sees the same Hadron rescattering will change the correlation Between leading and sub-leading hadrons

28 Measuring Parton Energy Loss ETET p T trig

29 Partonic energy loss: (6) SPS

30 Summary Discovery of Jet Quenching proves that a strongly interacting dense matter is formed: Opaque to jets Jet quenching is caused by partonic energy loss Dense matter at RHIC is 30 times higher than cold nuclei Collective behavior: Hydrodyamic limit (talks by Csernai,Huovinen, Nonaka) It has to be QGP within QCD Jet tomography become useful and power tool for studying properties of dense matter

31 Hard Probes Collaboration Jet and high pt hadron Quarkonium Heavy Quarks Direct Photons DY http://www-hpc.lbl.gov/ Hard Processes in p+p, p+A and A+A

32 Parton Shadowing in Nuclei EMC shadowing

33 Energy Dependence Thermal absorption important at lower E Detailed balance Enke Wang & XNW PRL87(01)142301

34 Medium Modified Fragmentation

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