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Recontres de Moriond, March

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Presentation on theme: "Recontres de Moriond, March"— Presentation transcript:

1 Recontres de Moriond, March 17 2005
High PT Physics at RHIC Xin-Nian Wang Lawrence Berkeley National Laboratory

2 QCD phase transition (approx.) Chiral symmetry and its spontaneous breaking: Goldstone boson and chiral condensate SU(3) gauge symmetry: Asymptotic freedom Confinement In contrast to the simplicity of the QCD Langranigan scale anomaly (break scale invariance)

3 Lattice QCD results F. Karsch ‘2001
The challenge of heavy-ion collisions is …

4 Medium Response Function
Dynamic System: Photon or dilepton emission (space-like photon) J/Y suppression QCD Response: Strong quark scattering

5 DIS off Nuclei e- Frag. Func.

6 Twist Expansion

7 LPM interference Effect
Formation time

8 Modified Fragmentation
Guo & XNW’00 Modified splitting functions Two-parton correlation: LPM Virtual correction important, rediscovered by BDMS

9 HERMES data E. Wang & XNW 2000 in Au nuclei

10 Parton Energy Loss Quark energy loss = energy carried by radiated gluon Asymptotic form of parton energy loss BDPM Gyulassy Vitev Levai Wang & Wang Wiedemann; Zakharov

11 High pt spectra in pp collisions
H. Zhang J. Owens E. Wang XNW 2005 To give you a test of what the high pt physics is like….

12 High pt spectra in Au+Au
H. Zhang,E. Wang J. Owens, XNW 2005

13 Jet Quenching at RHIC XNW’03

14 Geometry of dense matter
jet Azimuthal asymmetry Non-central collisions

15 No suppression in d+Au STAR PHENIX

16 pT spectra at large rapidity
Gluon saturation or color glass condensate ? Catalin Ristea (BRHAMS) Edmond Iancu (Theory) Greg Rakness (STAR)

17 Energy Dependence of quenching
D. d’Enterria, Hard Probes 2004

18 Effect of non-Abelian energy loss
Qun Wang & XNW nucl-th/ Fixed pT=6 GeV Eskola Honkanen Salgado Wiedemann DEg=DEq DEg=2DEq

19 Dihadron Correlation trigger Df pTtrig=4-6 GeV pT=2-4 GeV
Pedestal&flow subtracted Pedestal&flow subtracted pTtrig=4-6 GeV pT=2-4 GeV

20 Away-side suppression
Even with NLO calculation ….

21 Modification of the dihadron distribution
Pedestal&flow subtracted z STAR preliminary Effect of longitudinal flow C. Salgado

22 Jet Remnants PHENIX STAR

23 Angular distribution of radiative gluons
Radiation in vacuum q Induced Bremsstrahlung: Further interaction of the radiated gluons with the medium?

24 Sonic Boom Casalderrey-Solana, Shuryak and Teaney
Linearize disturbance qM Trigger

25 Summary Large suppression of high pT spectra Strong medium modification of jet structure 30 times higher gluon density than cold nuclei

26 Bulk Elliptic Flow Pressure gradient anisotropy Hydro-dynamics calc.
Self quenching

27 Summary Large suppression of high pT spectra
Strong medium modification of jet structure 30 times higher gluon density than cold nuclei Strongly interacting quark-gluon plasma Beginning of jet tomography study Details of modified fragmentation Heavy quark fragmentation (R. Averbeck) Dihadron fragmentation Jet-gamma events

28

29 Di-hadron fragmentation function
jet Majumder

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

31 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

32 Charm quark Large charm quark Suppression? Hadronic scattering?

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

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