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Search for Quark­Gluon Plasma from RHIC to LHC



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Search for Quark Gluon Plasma from RHIC to LHC Hard Probes at RHIC What to Expect at LHC John Harris Yale LNF Spring School Frascati 12 16 May 2008 Jets High pT Particles in Proton Proton Collisions Hard probes early times Calculable in pQCD QCD Factorization D c proton f xa a b ab xb f proton d D d 3 d ab cd 2 2 E 3 f a A xa Q f b B xb Q Dh c zc Q 2 dp dt John Harris Yale ISSP 06 Erice Sicily Italy 29 Aug 7 Sep 2006 Jets High pT Particles Nucleus Nucleus Collisions Fragmentation phadron Fragmentation z pp hadron parton z p parton Rcone Same as pp case except partons propagate in medium kT radiative corrections pre and post scattering di jet In QCD Medium Additional kT Gyulassy et al nucl th 0302077 in je t Significant nch increases energy loss high pT suppression in jet z decreases Sensitive to color properties of medium John Harris Yale ISSP 06 Erice Sicily Italy 29 Aug 7 Sep 2006 At RHIC High Momentum Hadrons Are Suppressed Photons Not dev Deviations from binary scaling of hard collisions RAA p g N AA N coll N ppp g Photons Hadrons factor 4 5 suppression John Harris Yale LNF Spring School Frascati 12 16 May 2008 RHIC Compare Au Au with d Au control experiment Hadron spectra at RHIC in p p Au Au d Au establish existence of early parton energy loss from strongly interacting QCD matter in central Au Au collisions Au Au Experiment Final Data John Harris Yale d Au Control Experiment Final Data LNF Spring School Frascati 12 16 May 2008 Dynamical Origin of High pT Hadron Suppression How does parton lose energy What happens to the radiation Gluon radiation E q Collision E loss How does E depend on the type of parton For collisional energy loss what about recoil energy Egluon Equark m 0 Equark m 0 One parameterization of energy loss John Harris Yale q 2 LNF Spring School Frascati 12 16 May 2008 Parameterization of Parton Energy Loss q Eskola Honkanen Salgado Wiedemann Nucl Phys A747 2005 511 q q 5 15 GeV2 fm John Harris Yale from RHIC RAA Data LNF Spring School Frascati



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