# Presentation: 646239

## CIPANP Relativistic Heavy Ion (RHI) Parallel Session

**Probes of Dense Gluonic Matter (part II)**
- Jet Quenching and Energy Loss - Miklos Gyulassy

**CIPANP Relativistic Heavy Ion (RHI) Parallel Session**

## The QGP Paradigm

- Proc. Quark Matter 1981-2002

## Ln 1/x

- The CGC Paradigm

- Iancu, Venugopalan hep-ph/0303204

## pT Distribution of Charged Particles

- Systematic Errors not shown

- Phobos Preliminary

**p****T**** Distribution of Charged Particles**

- G.Roland

- Bulk

## The high pT window at RHIC is now wide open

**Au-Au ****nucl-ex/0304022**

- The high pT window at RHIC is now wide open

**p+p-> ************hep-ex/0304038**

**STAR PRL 89, 202301**

**nucl-ex/0305015**

## Jet Tomography of QCD Matter   

****

- Ivan Vitev, Peter Levai, Xin-Nian Wang, MG

**Reviewed in nucl-th/0302077**

**R****AA****: High p****T**** Suppression**

-   Au-Au          200 GeV:

**Au-Au ****nucl-ex/0304022**

**Au-Au ****nucl-ex/0304022**

**M. G. Perdekamp, RHIC/AGS May 15,2003**

## pQCD tomography

- I.Vitev et al

- GRV
- EKS
- BKK
- GLV

## Single Hadron Tomography from SPS, RHIC, LHC

**Cronin dominates at SPS**
**Cronin+Quench+Shadow**
**        ****conspire to give ~ flat **
**        ****R~N****part****/N****bin ****at RHIC**
**        ****dN****g****/dy ~ 1000 -> ********g**** ~100 ********0**
**Predicts sub  N****part**** quench,**
**        ****positive pT slope of R at LHC**
**        ****and R****LHC****(40)~R****RHIC****(40)**

**Ivan Vitev and MG, Phys.Rev.Lett. 89 (2002)**

## Mono Jets from STAR at RHIC(STAR, PRL 90, 082302(2002))

***Di-Jets from p + p at 200 GeV***

- STAR, AGS Users Meeting May 15, 2003

- ●   Au+Au
-         p + p

## Suppression and correlationSTAR: 200 GeV Au+Au / p+p

**Hadron suppression and disappearance of back-to-back ‘jet’ are correlated!**
**STAR PRL 90, 082302**

- ●   Au+Au
-         p + p

- STAR Preliminary

- STAR, AGS Users Meeting May 15, 2003

## Centrality Dependence of  Quenching 

- Centrality Dependence of  Quenching

- PHENIX AuAu 200:  nucl-ex/0304022

- Consistent
- With GLV
- Formalism

## Slide 13

## Cronin?

- XN Wang, MG

**Soft Lund strings**

**Mini-jets**

- Need pA (or dA) to eliminate jet quenching

## Unquenched Predictions for for d+Au

**X.N.Wang, nucl-th/0303004**

**A.Accardi et al.**

**pQCD partonic level ****Glauber-Gribov**

**P.Levai et al.**

- XNWang, PRC61(00)064910

## Our NULL Quenching Prediction for dA for x>0.01 is confirmed ! AA quench must be final state interactions

- Our NULL Quenching Prediction for dA for x>0.01 is confirmed ! AA quench _must_ be final state interactions

**PHOBOS Preliminary**

**STAR Preliminary**

- Gyulassy-16

- CIPANP 5/21/03

## The NULL Quenching Prediction for dA (for x>0.01) is confirmed ! 

- The NULL Quenching Prediction for dA (for x>0.01) is confirmed !

**PHOBOS Preliminary**

**STAR Preliminary**

- CIPANP 5/21/03

**D+Au Preliminary**

**Au+Au Final**

- AA quench _must_ be
- due to final state
- interactions: **Jet Quenching**

##     0 RAA Predictions vs Experiment for    central Au+Au and d+Au collisions

-     0 **R****AA**** Predictions vs Experiment for****    central Au+Au and d+Au collisions**

- d+Au: I. Vitev, nucl-th/0302002 and private communication.
- Au+Au: I. Vitev and M. Gyulassy, Phys.Rev.Lett.89:252301,2002; hep-ph/0208108; M. Gyulassy, P. Levai and I. Vitev, Nucl. Phys. B 594, p. 371 (2001).

- Run 2002/2003 d-Au          200 GeV: PRELIMINARY

- shadowing

- anti-shadowing

## d+Au: two-particle correlations 

- d+Au: two-particle correlations

-  no normalization to underlying event
-  “central”: top 20% FTPCE multiplicity

-  underlying event grows: p+p d+Au minbias d+Au central
-  near-side: correlation strength and width similar
-  away-side: d+Au peak broadens but little centrality dependence

- Unquenched back-to-back jets are observed in central d+Au!

- From P. Jacobs for STAR

- Check mate!
- The NULL dA Quench prediction is seen in full
- strength back-to-back
- Correlations as in p+p

## Does the pQCD tail wag the QGP dog?

- Systematic Errors not shown

- Phobos Preliminary

**Does the pQCD tail wag the QGP dog?**

- G.Roland

- BULK

##  d+Au was the critical NULL quench

-  d+Au was the critical NULL quench
-            	_control  experiment _
-  Au Au RHIC data are now only  	consistent with
-               _QGP Paradigm!_
-  Jet quenching _*IS*_ due to final state  	interactions in an opaque QGP
-  Bulk Elliptic flow pT< 2 GeV saturates hydrodynamic limit for first time
- V2(pt; h) is consistent with lattice QCD equation of state

- Conclusions:
- After the first 3000 man-years at RHIC

- More good NEWS:

## Collective Flow of Bulk QCD matter?

- P.Kolb et al, D.Teany et al

## Experimental To Do List

- Y=+- 3 dAu to test if x=0.001 QGP->CGC ?
- C2(phi1,phi2, pt1,pt2, eta1,eta2, fl1,fl2, Mult, A,B, Ecm)
- Heavy Quark tomography   [ Magdalena Djordjevic]
- Open Charm (enhancement?);   J/Psi (suppression?)
-        Charm Flow?                    [ Sotiria Batsouli ]
- Need Direct Photons thermometer
-       and tagged  direct photon -quark jets!
- Excitation function Ecm~50-100, A=20-100

## Theory To Do  List

- HBT source Ecm invariance?
-              why No time-delay?
- ET/N   Ecm invariance, Npart invariance?
- NEW**      V2(pT)  Ecm invariance !?
-          source of Flat High pt saturation
- V2(y)   *NON* Bjorken boost invariant
-  Baryon transport dynamics
- Thermalization, QGP Transport theory

## Selected References on Jet Quenching

**JET QUENCHING AND RADIATIVE ENERGY LOSS IN DENSE NUCLEAR MATTER.**By Miklos Gyulassy (Columbia U.), Ivan Vitev (Iowa State U.), Xin-Nian Wang (LBL, Berkeley), Ben-Wei Zhang (Hua-Zhong Normal U.). Feb 2003. 69pp. Published in Quark Gluon Plasma 3, editors: R.C. Hwa and X.N. Wang, World Scientific, Singapore. e-Print Archive: **nucl-th/0302077**

**HIGH P(T) TOMOGRAPHY OF D + AU AND AU+AU AT SPS, RHIC, AND LHC.**By Ivan Vitev (Columbia U. & Iowa State U.), Miklos Gyulassy (Columbia U.). Sep 2002. 4pp. Published in **Phys.Rev.Lett.89:252301,2002** e-Print Archive: **hep-ph/0209161**

**JET TOMOGRAPHY OF AU+AU REACTIONS INCLUDING MULTIGLUON FLUCTUATIONS.** By M. Gyulassy (Columbia U.), P. Levai (Budapest, RMKI), I. Vitev (Columbia U.). Dec 2001. 6pp. Published in **Phys.Lett.B538:282-288,2002** e-Print Archive: **nucl-th/0112071**

**HIGH P(T) AZIMUTHAL ASYMMETRY IN NONCENTRAL A+A AT RHIC.**By M. Gyulassy (Columbia U. & LBL, Berkeley), I. Vitev (Columbia U.), X.N. Wang (LBL, Berkeley). Dec 2000. 4pp. Published in **Phys.Rev.Lett.86:2537-2540,2001** e-Print Archive: **nucl-th/0012092**

**REACTION OPERATOR APPROACH TO NONABELIAN ENERGY LOSS.**By M. Gyulassy (Columbia U.), P. Levai (Columbia U. & Budapest, RMKI), I. Vitev (Columbia U.). CU-TP-979, Jun 2000. 39pp. Published in **Nucl.Phys.B594:371-419,2001** e-Print Archive: **nucl-th/0006010**

**NONABELIAN ENERGY LOSS AT FINITE OPACITY.**By M. Gyulassy (Columbia U.), P. Levai (Columbia U. & Budapest, RMKI), I. Vitev (Columbia U.). CU-TP-976, May 2000. 4pp. Published in **Phys.Rev.Lett.85:5535-5538,2000** e-Print Archive: **nucl-th/0005032**

- See also refs therein