Gunther Roland/MITZakopane 6/2/2003 Physics Results from RHIC Gunther Roland XLIII Cracow School of...
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Transcript of Gunther Roland/MITZakopane 6/2/2003 Physics Results from RHIC Gunther Roland XLIII Cracow School of...
![Page 1: Gunther Roland/MITZakopane 6/2/2003 Physics Results from RHIC Gunther Roland XLIII Cracow School of Theoretical Physics Zakopane 5/30-6/7 2003.](https://reader034.fdocuments.in/reader034/viewer/2022042603/56649d7a5503460f94a5e0c3/html5/thumbnails/1.jpg)
Gunther Roland/MIT Zakopane 6/2/2003
Physics Results from RHIC
Gunther Roland
XLIII Cracow School of Theoretical Physics
Zakopane 5/30-6/7 2003
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Gunther Roland/MIT Zakopane 6/2/2003
Exploring QCD with Heavy Ions
Matter Density B (GeV)
Tem
per
atu
re (
MeV
)
Quark-Gluon Plasma
Hadron Gas
Phase Boundary
Early Universe
0
200
0
Atomic Nuclei
1
Critical Point
I
II
III
IV
o Structure of Relativistic Nuclei
o Mechanism of Entropy Production
o QCD phase diagram
o Properties of QGP
I II III IV
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Gunther Roland/MIT Zakopane 6/2/2003
Two Lectures
I. Bulk Production
II. Hard Scattering
Charged Hadron
pT-Spectrum in
Au+Au at RHIC
(PHOBOS)
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Gunther Roland/MIT Zakopane 6/2/2003
Bulk Production
Hard Scattering
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Gunther Roland/MIT Zakopane 6/2/2003
Initial State
‘Final State’ Interactions
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Gunther Roland/MIT Zakopane 6/2/2003
Control Parameters: sqrt(s)
Different sqrt(s) dependence of ‘soft’ vs ‘hard’ processes
Drees, QM’01
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Gunther Roland/MIT Zakopane 6/2/2003
Control Parameters: Centrality
b
2R ~ 15fm
Spectators
Spectators
Participant Region
Smaller Impact Parameter b
Bigger Collision System
More Participants (Npart) = Wounded Nucleons
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Gunther Roland/MIT Zakopane 6/2/2003
Control Parameters: Centrality
inel=42 mb(RHIC)
Glauber Monte Carlo
inel=33 mb (SPS)
inel=21 mb (AGS)
• Centrality controls– Volume (Npart)
– No. of binary collisions (Ncoll)
– Shape of interaction region
• Npart vs Ncoll
– soft vs hard processes– coherent vs incoherent
production
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Gunther Roland/MIT Zakopane 6/2/2003
Relativistic Heavy Ion Collider
First Physics in ‘00
Versatile machine – Au+Au (‘00-’02)
• 19.6 GeV
• 56 GeV
• 130 GeV
• 200 GeV
– p+p (‘02,’03)• 200 GeV
polarized
– d+Au (‘03)• 200 GeV• 4 Experiments
– 2 big– 2 small
• Complementary capabilities
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Gunther Roland/MIT Zakopane 6/2/2003
STAR
• Large acceptance tracking detector• Mass, charge and momentum for >1000 hadrons
per event
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Gunther Roland/MIT Zakopane 6/2/2003
PHENIX
• High Rate, Particle ID, Triggering
• Rare particles: Leptons, High pT
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Gunther Roland/MIT Zakopane 6/2/2003
PHOBOS
• Full Acceptance Multiplicity Detector• High precision spectrometer near y=0 (low pT)
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Gunther Roland/MIT Zakopane 6/2/2003
BRAHMS
• Particle Production at small angles
• High resolution spectrometer & good particle ID
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Gunther Roland/MIT Zakopane 6/2/2003
Part I: Bulk Particle Production
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Gunther Roland/MIT Zakopane 6/2/2003
Rapidity Density
600 1200
Central Au+Au (200 GeV)
Predicted Multiplicity for RHIC
• Extrapolate– A+A at 20 GeV– p+p at 200 GeV
Compilation by K. Eskola
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Gunther Roland/MIT Zakopane 6/2/2003
4- Multiplicity at RHICd
N/d
Pseudo-rapidity
19.6 GeV 130 GeV 200 GeVPHOBOS PHOBOS PHOBOS
BRAHMS 130 GeV BRAHMS 200 GeV
dN
/d
PHOBOS nucl-ex/0210015
BRAHMS PLB 523 (2001) 227, PRL 88 (2002) 202301
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Gunther Roland/MIT Zakopane 6/2/2003
Result vs Predictions
• Multiplicity at low end of range• Most models didn’t do so well
Rapidity Density
600 1200
Central Au+Au (200 GeV)
Color Glass
Parton Saturation Kharzeev, Levin
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Gunther Roland/MIT Zakopane 6/2/2003
Limiting FragmentationBRAHMS PHOBOS
• Study shape in rest-frame of one nucleus
• Distributions fall on limiting curve at large
• Limiting curve is unique for each centrality bin
PHOBOS nucl-ex/0210015BRAHMS PRL 88 (2002) 202301
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Gunther Roland/MIT Zakopane 6/2/2003
Au+Au
(preliminary)
Nch scaling vs Npart
Nch proportional to Npart
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Gunther Roland/MIT Zakopane 6/2/2003
Au+Au
(preliminary)
Nch scaling vs Npart
Nch proportional to Npart
Constant of proportionality = Nch in e+e- at same sqrt(s)
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Gunther Roland/MIT Zakopane 6/2/2003
(Mueller 1983)
)/exp( sAsch BN αα∝
Total Multiplicity vs. Beam EnergyPHOBOS QM’02, Steinberg
pp/pp
A+A
e+e-
Central A+A
<N
ch>
/e+e- F
it
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Gunther Roland/MIT Zakopane 6/2/2003
Rapidity Distributions at 200 GeV
yT
Surprising agreement in shape between AA/e+e- /pp
e+e- measures dN/dyT
(rapidity relative to“thrust” axis)
AA/pp ~ 1.4-1.5
200 GeVCentral Au+Au
q
q
PHOBOS QM’02, Steinberg
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Gunther Roland/MIT Zakopane 6/2/2003
Particle density near midrapidity
RHIC combined
e+e- scales likeAA near midrapidity
(dN/dyT )
RHIC combined
PHOBOS QM’02
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Gunther Roland/MIT Zakopane 6/2/2003
Centrality Dependence at | < 1
_pp
Au+Au
19.6 GeVpreliminary
130 GeV
200 GeV
Saturation model works from 20 to 200 GeV
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Gunther Roland/MIT Zakopane 6/2/2003
What is the Energy Density?
= 650 * 1GeV/( R2 *1 fm/c) = 4 GeV/fm3
Much bigger than crit…
…if we have fast thermalization!
Rapidity Density
600 1200
Central Au+Au (200 GeV)
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Gunther Roland/MIT Zakopane 6/2/2003
Azimuthal Anisotropy
“Head on” view of colliding nuclei
Peripheral
Central
Initial State AnisotropyCoordinate Space
Final State AnisotropyMomentum Space
Interaction!
2*v2
Azimuthal Angle (rad)
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Gunther Roland/MIT Zakopane 6/2/2003
Anisotropy v2 vs Centrality
STAR
|| < 1.3
0.1 < pt < 2.0
PHOBOS
PHENIX Up to mid-central collisions, v2 reaches hydro limit
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Gunther Roland/MIT Zakopane 6/2/2003
Hydrodynamics and v2
Teaney, Lauret, Shuryak, nucl-th/0110037
Kolb, Heinz, nucl-ex/0204061
• Data consistent with hydro calculations • Sensitivity to EoS
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Gunther Roland/MIT Zakopane 6/2/2003
Hydro Equation of State
Kolb, Heinz, nucl-ex/0305084
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Gunther Roland/MIT Zakopane 6/2/2003
Parameters:0 = 0.6 fm/cs0 = 110 fm-3
s0/n0 = 250Tcrit=Tchem=165 MeVTdec=100 MeV
Hydrodynamics and Spectra
Kolb, Rapp, Phys. Rev. C 67 (03) 044903
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Gunther Roland/MIT Zakopane 6/2/2003
Blast wave fit
p
K
Blast wave:– “Hydro-inspired” Fit– Parametrize Final State
• Local thermal equilibrium (T)
• Linear radial flow profilex,y(r) = 0,x,y * r
• Geometrical size rx and ry
• Freeze-out time o and duration o
Even better than the real thing…
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Gunther Roland/MIT Zakopane 6/2/2003
Blast wave Fits to Spectra
Simultaneous Fit to ,k,p gives
Kinetic Freeze-Out Temperature,
Transverse Expansion velocity
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Gunther Roland/MIT Zakopane 6/2/2003
Blast wave Fit to Correlation Data
Fabrice Retiere SQM ‘03, Mike Lisa
Consistent Data from
STAR, PHENIX, PHOBOS
Also
HBT vs reaction plane
Unlike particles
Balance Functions
Short-lived Resonances
Consistent Results
Lifetime ~ 10 fm/c
Particle emission over
few fm/c
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Gunther Roland/MIT Zakopane 6/2/2003
Hydro and Correlation Data
Kolb, Heinz nuclt-th/0305084
Hydro calculation underestimates size, overestimates time
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Gunther Roland/MIT Zakopane 6/2/2003
Statistical Model Fit
Relative Abundances: Two Parameters (or three or four) !
Caveat: Resonances, Phase-space over/under population
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Gunther Roland/MIT Zakopane 6/2/2003
Tchem vs Tkin
Florkowski, Broniowski, nucl-th/0212052
Addition of resonances may
allow freezeout with Tchem = Tkin
c.f. Torrieri, Rafelski, nucl-th/030507
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Gunther Roland/MIT Zakopane 6/2/2003
Physics Results from RHIC: Lecture II
Gunther Roland
XLIII Cracow School of Theoretical Physics
Zakopane 5/30-6/7 2003
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Gunther Roland/MIT Zakopane 6/2/2003
Memento: Bulk Particle Production @ RHIC
– Saturation consistent w/ multiplicity systematics
– Final state anisotropy indicates “Thermalization” Energy
Density: > 5 GeV/fm3
– Momentum distributions and correlations are hydro-like,
with a large radial flow field
– Hydrodynamic calculations show sensitivity of results to
EoS; many qualitative features
– Timescales are very short: Thermalization, Expansion,
Freeze-out
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Gunther Roland/MIT Zakopane 6/2/2003
2nd Lecture
I. Bulk Production
II. Hard Scattering
Charged Hadron
pT-Spectrum in
Au+Au at RHIC
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Gunther Roland/MIT Zakopane 6/2/2003
Dense Matter Diagnostics
Leading Particle
Hadrons
q
q
Hadrons
Leading Particle
Jet cross-section calculable in QCD
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Gunther Roland/MIT Zakopane 6/2/2003
Dense Matter Diagnostics
Leading Particle
Hadrons
q
q
Hadrons
Leading Particle
Hadrons
q
q
Hadrons
Leading Particle
Jet cross-section calculable in QCD
Study fate of jets in dense matter in Au+Au
Leading Particle
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Gunther Roland/MIT Zakopane 6/2/2003
STAR Au+AuOpal e+e-
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Gunther Roland/MIT Zakopane 6/2/2003
Dense Matter Diagnostics
Leading Particle
Hadrons
q
q
Hadrons
Leading Particle
Hadrons
q
q
Hadrons
Leading Particle
Jet cross-section calculable in QCD
Study fate of jets in dense matter in Au+Au
Poor man’s jet: Leading Particles
Leading Particle
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Gunther Roland/MIT Zakopane 6/2/2003
Charged Hadron Spectra
Preliminary sNN = 200 GeV
Preliminary sNN = 200 GeV
Results from all RHIC experiments!
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Gunther Roland/MIT Zakopane 6/2/2003
Control Parameters: Centrality
inel=42 mb(RHIC)
Glauber Monte Carlo
inel=33 mb (SPS)
inel=21 mb (AGS)
• Total yield scales with Npart
– Volume-scaling <-> Coherence
• Expect Ncoll scaling for hard (point-like) processes – Incoherent production
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Gunther Roland/MIT Zakopane 6/2/2003
“Jet Quenching” at High pT
Yield at high pT in AA is 6 times smaller than expected
expected
observedproton+proton
Au+Au
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Gunther Roland/MIT Zakopane 6/2/2003
Jets in Dense Matter
Are we really looking at jets?• Look for jet structure by
measuring– small angle correlations– back-to-back
correlations
relative to high pT leading particle
Hadrons
q
q
Hadrons
Leading Particle
Leading Particle
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Gunther Roland/MIT Zakopane 6/2/2003
Peripheral Au+Au data
• Jets seen in peripheral Au+Au and p+p• Azimuthal correlations
– Small angle ( ~ 0)– Back-to-Back ( ~ p)
D. Hardtke
QM ‘02
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Gunther Roland/MIT Zakopane 6/2/2003
Central Au+Au data
• Disappearance of back-to-back correlations in central Au+Au
• Away-side particles absorbed or scattered in medium
D. Hardtke
QM ‘02
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Gunther Roland/MIT Zakopane 6/2/2003
Jet suppression via Energy LossVitev, Gyulassy, PRL 89 (2002)
Suppression due to the energy loss of fast partons in
plasma via induced gluon radiation
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Gunther Roland/MIT Zakopane 6/2/2003
Centrality Dependence of Suppression
STAR Preliminary
Central
Peripheral
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Gunther Roland/MIT Zakopane 6/2/2003
Another Look at Centrality Dependence
approximate Npart-scaling at“intermediate” pT !?
PHOBOS, nucl-ex/0302015
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Gunther Roland/MIT Zakopane 6/2/2003
Npart Scaling in Saturation Model
High pT suppression as an initial state effect:Parton saturation breaks incoherence
Kharzeev, Levin, McLerran, hep-ph/021332
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Gunther Roland/MIT Zakopane 6/2/2003
Experimental Test: d+AuVitev, nucl-th/0302002, Phys.Lett.B in press Vitev and M.Gyulassy, Phys.Rev.Lett. 89 (2002)
Central
Peripheral
Fixed target p+A data Prediction for RHIC
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Gunther Roland/MIT Zakopane 6/2/2003
Experimental Test: d+Au
Central
Kharzeev, Levin, McLerran, hep-ph/021332
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Gunther Roland/MIT Zakopane 6/2/2003
Preliminary Results for d+Au
PHENIX Preliminary 1 errors
STAR Preliminary
• Min-bias d+Au data from PHENIX/STAR, relative to p+p– Similar to low-energy data (Cronin effect)– No suppression
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Gunther Roland/MIT Zakopane 6/2/2003
Centrality dependence of RdAu
PHOBOSpreliminary
PHOBOSpreliminary
PHOBOSpreliminary
PHOBOSpreliminaryR
dA
u Rd
A
u
Yie
ld/<
Np
art/2
>/p
+p
fit
Yie
ld/<
Np
art/2
>/p
+p
fit
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Gunther Roland/MIT Zakopane 6/2/2003
Back-to-back ‘Jets’ in d+Au
d+Au
Au+Au
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Gunther Roland/MIT Zakopane 6/2/2003
Preliminary Lesson from d+Au
• Back-to-Back Jets are observed• Data compatible with extrapolation of Cronin-effect to
RHIC• No suppression effects seen• If data holds: “Jet quenching” indicative of light
parton energy loss (2-3 GeV) in a dense medium
Some high-pT “puzzles” remain ->
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Gunther Roland/MIT Zakopane 6/2/2003
“Instant” ThermalizationE. Shuryak, nucl-th/0112042
STAR
Central
Peripheral Limit (mfp = 0)
v 2
S. Voloshin, QM’02
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Gunther Roland/MIT Zakopane 6/2/2003
“Proton puzzle”
dN/dpT(p) ~ dN/dpT()
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Gunther Roland/MIT Zakopane 6/2/2003
“Suppression” for light/heavy hadrons
• High-pT hadrons from fragmentation of fast partons:
– Suppression/energy loss should effect all hadrons
– But: No suppression for baryons at 2 < pT < 4 GeV/c
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Gunther Roland/MIT Zakopane 6/2/2003
Baryon v2
• At high-pT
– Baryon anisotropy exceeds that for mesons
– Also seen for p vs
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Gunther Roland/MIT Zakopane 6/2/2003
New (old) Idea: Recombination
Fries, Mueller, Nonaka, Bass, nucl-th/0301087
Greco, Ko, Levai, nucl-th/0301093
Molnar, Voloshin, nucl-th/0302014]
Lopez, Parikh, Siemens, PRL 53 (1984) 1216
• Dense partonic medium– Hadron production by quark
recombination (coalescence)
– Fries et al: Favorable relative to fragmentation for thermal parton momentum distribution
Fragmentation
Recombination
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Gunther Roland/MIT Zakopane 6/2/2003
Recombination/Fragmentation
Teff = 350 MeV blue-shifted temperature
pQCD spectrum shifted by 2.2 GeV
Fries, Mueller, Nonaka,Bass nucl-th/0301087
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Gunther Roland/MIT Zakopane 6/2/2003
Recombination and v2
• Looking “per quark”:– Common behavior for Baryons/Mesons– Do we see partonic flow?– Gluons? Entropy?
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Gunther Roland/MIT Zakopane 6/2/2003
Recombination/Fragmentation and v2
Bass, CIPANP ‘03
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Gunther Roland/MIT Zakopane 6/2/2003
Recombination/Fragmentation and SpectraBass, CIPANP ‘03
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Gunther Roland/MIT Zakopane 6/2/2003
Summary Lecture II
• Extensive data sets for intermediate/high pT
• Observation of several unique effects– Violation of collision scaling– Large elliptic flow (Baryons vs Mesons)– Proton puzzle
• New data (d+Au) and new ideas (recombination)– Suggest we’re looking at:
• Energy loss of fast partons in dense partonic matter• Collective flow of partonic matter