Search for Quark-Gluon Plasma from RHIC to LHC: Hard Probes at RHIC & What to “Expect” at LHC!Jets & High pT Particles in Proton-Proton CollisionsJets & High pT Particles Nucleus-Nucleus CollisionsAt RHIC - High Momentum Hadrons Are Suppressed, Photons NotRHIC -Compare Au + Au with d + Au (control experiment)Dynamical Origin of High pT Hadron Suppression?Parameterization of Parton Energy LossInterpretation of the Parton Energy Loss at RHICAdS5/CFT Again! - Initial Results on Jet QuenchingRAA of Heavy Quarks from Non-photonic Electrons“Dead Cone Effect” for Heavy QuarksRHIC - RAA of Heavy Quarks from Non-photonic ElectronsRHIC - Heavy Quark SuppressionHard Scattering (Jets) as a Probe of Dense MatterHard Scattering: Two-Particle Azimuthal CorrelationsSlide 17Relative Charge DependenceUsing p+p to Study Au+Au Jet Correlations at RHICHammering the Nail in the CoffinWhere Does the Energy Go?A Closer Look at the Away-Side of JetsResponse of the Medium?The suppression of high pT hadrons and the quenching of jets indicates the presence of a high density, strongly-coupled colored medium!Response of the Medium in AdS/CFTA Real Test of “Theories” in the Future from Heavy Flavors at RHIC & LHC?Explaining the AdS/CFT EquivalenceSummary of Hard Scattering at RHICA Couple More RHIC Results of Interest - Observation of Thermal Photons - Charmonium SuppressionThermal Photons at RHICCharmonium Suppression at RHICQuarkonium Suppression at LHC – Deconfinement?LHC Heavy IonsHeavy Ion Physics at the LHCSlide 35Jet-finding – Much Work Already at LEP & TevatronJet-finding - Learning from the TevatronJet-finding Approach with Heavy IonsSlide 39ATLAS Heavy Ion ProgramExample of Anticipated Jet MeasurementsCMS Heavy Ion ProgramFragmentation Functions in CMSA Little More About ALICE the Dedicated Heavy Ion Experiment (a huge Italian involvement, including Frascati!)ALICEA View of ALICE Under ConstructionSlide 47An ALICE PbPb EventALICE Physics MeasurementsALICE EMCalHard Probe Capabilities of ALICE with EMCalMeasuring the PbPb Fragmentation FunctionThe Quark-Gluon Plasma - Today’s View from RHICMany Things to Do with Heavy Ions at the LHC!Special Thanks for Contributions to This Presentation!!Slide 56The EndSlide 59Slide 60Electron RAA at LHC!Start of Jet-finding at RHIC and LHCALICE Detectors & AcceptanceStill to do!High pT Heavy Ion Physics at the LHCRAA at LHC!Heavy Flavors & Hard Processes at LHCHigh pT Physics with Heavy Ions at the LHCJohn Harris (Yale) LNF Spring School, Frascati 12 – 16 May 2008Search for Quark-Gluon Plasma from RHIC to LHC:Hard Probes at RHIC & What to “Expect” at LHC!John Harris (Yale) ISSP’06 Erice, Sicily, Italy, 29 Aug – 7 Sep 2006Jets & High pT Particles in Proton-Proton CollisionsHard probes  early timesCalculable in pQCD:“QCD Factorization”ffprotonprotonabDDabdc     22233,ˆ,, QzDdtdQxfQxfdpdEcchcdabbBbaAaxaxbJohn Harris (Yale) ISSP’06 Erice, Sicily, Italy, 29 Aug – 7 Sep 2006 except: partons propagate in mediumIn QCD MediumAdditional kT Significant energy loss  high pT suppressionSensitive to color Sensitive to color properties of mediumproperties of mediumconeRJets & High pT Particles Nucleus-Nucleus Collisions Same as pp casekT“radiative corrections”pre- and post-scatteringdi-jet: Fragmentation:zhadronpartonpp�Fragmentation:p(hadron)p (parton)z =in jei j ttn e: increasesz : decreaseschnGyulassy et al., nucl-th/0302077John Harris (Yale) LNF Spring School, Frascati 12 – 16 May 2008At RHIC - High Momentum Hadrons Are Suppressed, Photons NotPhotonsHadrons factor 4 – 5 suppressiondev/AAAA/coll ppNRN Np gp g=Deviations from binary scaling of hard collisions:John Harris (Yale) LNF Spring School, Frascati 12 – 16 May 2008RHIC -Compare Au + Au with d + Au(control experiment)Au + Au Experiment d + Au Control ExperimentFinal DataFinal DataHadron spectra at RHIC in p+p, Au+Au & d+Auestablish existence of early parton energy loss fromstrongly interacting QCD matter in central Au-Au collisionsJohn Harris (Yale) LNF Spring School, Frascati 12 – 16 May 2008Dynamical Origin of High pT Hadron Suppression?What happens to the radiation?For collisional energy losswhat about recoil energy?Egluon > Equark, m=0 > Equark, m>0 How does E dependon the type of parton?q = 2 /  ^One parameterization of energy loss q ~ EGluon radiationCollision E-lossHow does parton lose energy?John Harris (Yale) LNF Spring School, Frascati 12 – 16 May 2008 Parameterization of Parton Energy Lossq ~ Eskola, Honkanen, Salgado, WiedemannNucl Phys A747 (2005) 511q ^ q = 5 – 15 GeV2 / fm from RHIC RAA Data ^John Harris (Yale) LNF Spring School, Frascati 12 – 16 May 2008Interpretation of the Parton Energy Loss at RHICq ~   LqxxGNNqmediumCCSpQCDˆ,14ˆ22Equilibrated gluon gas:medium ~ T3energy density  ~ T443ˆcq RHIC dataR. Baier, Nucl Phys A715, 209cQGPPion gasCold nuclear mattersQGPEnergy loss requires large(also : Dainese, Loizides, Paic, hep-ph/0406201)2ˆ5 10 GeV /fmq � -5 - 15John Harris (Yale) LNF Spring School, Frascati 12 – 16 May 2008AdS5/CFT Again! - Initial Results on Jet QuenchingH. Liu, K. Rajagopal and U. A. Wiedemann, arXiv:hep-ph/0605178, recent PRLfrom J. J. Friess, S. S. Gubser and G. Michalogiorgakis,arXiv:hep-th/0605292.John Harris (Yale) LNF Spring School, Frascati 12 – 16 May 2008 RAA of Heavy Quarks from Non-photonic Electrons• Non-photonic electrons come from semi-leptonic decays of heavy quarks– c  e+ + anything (B.R. = 9.6%)•Do  e+ + anything (B.R. = 6.87%) •D±  e ± + anything (B.R. = 17.2%)– b  e+ + anything (B.R. = 10.9%)•B±  e ± + anything (B.R. = 10.2%)– plus small contribution from Drell-Yan for pT < 10 GeV/cHeavy quarks thought too massive to be attenuated by medium!John Harris (Yale) LNF Spring School, Frascati 12 – 16 May 2008“Dead Cone Effect” for Heavy Quarks Dead Cone Effect (Y. Dokshitzer & D. Kharzeev et al., Phys. Lett. B 519 (2001) 1999):Gluon radiation from a massive parton is suppressed at small angles < mq / Eq(result of causality since vq < c)Energy loss is therefore reduced. Heavy quarks up to ~ 10 - 20 GeV/cJohn Harris (Yale) LNF Spring School, Frascati