1/6/02gyulassy-1 the space-time puzzle at rhic instead of slowly burning qgp log dt~ r/v def...
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1/6/02 Gyulassy-1
The Space-Time Puzzle at RHIC
Instead of slowly burning QGP Log R/vdef >>R
Evidence for Sudden freezeout R !
Amazingly independent of 1< KEcm< 100 AGeV
Yet there is Huge v2~0.15 out to 6 GeV, transverse flow , hadro equilibration, pbar > pi-, …
1/6/02 Gyulassy-2
AGS-SPS-RHICPion
Interferometry
• Central AuAu (PbPb)
• Why saturation?
• Why no rise in space or
temporal homogeneity?
STAR Preliminary
Z-Axis
Y-Axis
X-Axis
Sou
rce
Z-Axis
Y-Axis
X-Axis
P1
P2
q
K
BeamAxis
1/6/02 Gyulassy-3
Amazingly Weak Energy
dependence• Rout and Rside are energy
independent within error bars.• Smooth energy dependence in
Rlong
• No immediate indication of very different physics
• Fit Rlong to:
• AGS: A = 2.19 +/- .05• SPS: A = 2.90 +/- .10• RHIC: A = 3.32 +/- .03
Tm
A
-
M. Lisa et al., PRL 84, 2798 (2000)R. Soltz et al., to be sub PRCC. Adler et al., PRL 87, 082301I.G. Bearden et al., EJP C18, 317 (2000)
1/6/02 Gyulassy-4
HBT radii at 2 AGeV
M. Lisa
1/6/02 Gyulassy-5
Images of --emitting sources (scaled ~ x1014)
3 fm
x ’
y
2 AGeV
x
zS=47°
x ’
y
4 AGeV
x
zS=37°
x ’
y
6 AGeV
x
zS=33°
Large, positivetilt angles
35.1x~
y~
2
2
similar to naïveoverlap: b~5 fm
1/6/02 Gyulassy-6
PHENIX and STAR at RHIC
Amazing!
Hydro+UrQMDSoff, Bass, Dumitru (PRL 86)
1/6/02 Gyulassy-7
Rout/Rside vs. kT at AGS
1/6/02 Gyulassy-8
PION INTERFEROMETRY OF QUARK - GLUON PLASMA.
By S. Pratt (Minnesota U.). 1986.
Published in Phys.Rev.D33:1314-1327,1986
PION INTERFEROMETRY IN ULTRARELATIVISTIC HEAVY ION COLLISIONS.
G. Bertsch, M. Gong, M. Tohyama, Phys.Rev.C37:1896-1900,1988.
Why we expected more Rout>>Rside ?t
xQGP
HadronGas
Combustion TheoryVan Hove (83)GKMS (84)
Deflagration(Q->H Burn Front) vdef~dH/4dQ
t~R/vdef
Qout
Qside
IFF
1/6/02 Gyulassy-9 D. Rischke , MG, NPA 613(97)397
Continuous Cross Over vs First Order Bag Model Equation of State
QGP EOS
1/6/02 Gyulassy-10
D. Rischke, MG NPA 613(97)397
The QGP Stall
T=0 P=/3
0=20 GeV/fm3 evolved with hydro
QGP
Stall
~R
1/6/02 Gyulassy-11
P=/3T/Tc=0
D. Rischke, MG, NPA 613(97)397
Pratt-Bertsch C(qside,qout)
T/Tc=0.1Side
Out
qside
qout
1/6/02 Gyulassy-12
Rout/Rside
D. Rischke, MG NPA 613(97)397
T=0
T=Tc/10
P=/3
th R/10
QGP->ResonancesQGP-> Pions
1/6/02 Gyulassy-13
th 01/3T
QGP->ResonancesQGP-> Pions
Effect of Rapid Thermalization
Tf=Tc
NULLSolutions!!
1/6/02 Gyulassy-14
• long-lived dissipative hadronic phase dominates correlation signal dissipative hadronic phase: unavoidable consequence of thermalized QGP
IF strong incoherent resonance dynamics applies
Soff, Bass, Dumitru nucl-th/0012085
Dissipative Hadronic FSI distort pion lenses
1/6/02 Gyulassy-15
B.R. Schlei (QM 99) nucl-th/9904067
Predicted
1/6/02 Gyulassy-16See D. Teany, E. Shuryak
The Thorn in Hydro’s side
1/6/02 Gyulassy-17
Useful cartoon showing why HBT in AA is not easy to unfold
MANY 8D x-p correlated geometries give same HBT radii
P.Kolb, U. Heinz
1/6/02 Gyulassy-18
P.Kolb, U. HeinzHydro (x,y,t,K) Correlated Geometries
1/6/02 Gyulassy-19
Denes Molnar’s Parton Cascade
Diffuse correlated geometries
Rside
Rout
Rlong
Rout<Rside is possiblexout
xside
1/6/02 Gyulassy-20Fits are NOT explanations but convenient summary of data
1/6/02 Gyulassy-21
Corrections
P.Filip
??
Are Systematic Experimental Errors Under Control?
1/6/02 Gyulassy-22
More work on Coulomb correction needed
Better to show Uncorrected data andcompare to corrected theory !
P.Filip
sysR 1fm
1/6/02 Gyulassy-23
Systematic Theory HBT Errors
p
x
ClassicalTransportTheory
Wigner Wavepacket
thR ~1fm
See alsoS. Pratt …Padula,Gavin MG
NPB 329 (90) 357
x p /2
1/6/02 Gyulassy-24
D. Teany, E. Shuryak
Given th expR R ~2 fm Hydrodynamic HBT is surprisingly good agreement with Rout,side !
However, Rlong is tooo longg!
1/6/02 Gyulassy-25
New Attemps at sudden hadronization: Non-equilib Polyakov
L(A)
V(L)
But does this reallysolve RlongIs short? U.Heinz
Is it consistent with smalle-b-e fluctuations?
1/6/02 Gyulassy-26
Closing Remarks: (Sorry no time for Event-by-Event fluct)
•RHIC HBT has posed a serious thorn in theory side
•V2, flow, hadron ratios are consistent with EULER hydro up to pT~2 GeV, but hydro fails at AGS, SPS Yet HBT pattern is ~uniform in energy
•High pt>2GeV tails reveal jet quenching through very dense opaque matter
• Yet hadronization is of short duration (only marginally consistent with hydro Rout,side)
• Bjorken flow seems dead with short Rlong! Is Landau resurrecting?
•Are we on wrong hydro/transport track? Non-equilib classical fields? Inhomogeneous turbulence?
• Also need to go back to basics and review HBT assumptions
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