flow correlations @ rhic: “an abridged phenix view” roy a. lacey (for the phenix...
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Flow Correlations @ RHIC: “an abridged PHENIX view” Roy A. Lacey (for the PHENIX collaboration) Chemistry Dept. Stony Brook University. Aim Give a survey of PHENIX Flow measurements Highlight several implications What theorist need to know. Coupling. Thursday – 5:20 PM. - PowerPoint PPT PresentationTRANSCRIPT
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Roy A. Lacey, Stony Brook University; CATHIE-TECHQM Workshop, BNL USA, Dec 14-18th, 2009
Flow Correlations @ RHIC:“an abridged PHENIX view”
Roy A. Lacey (for the PHENIX collaboration)Chemistry Dept.
Stony Brook University
AimGive a survey of PHENIX Flow measurementsHighlight several implications What theorist need to know
2
Coupling
Roy A. Lacey, Stony Brook University; CATHIE-TECHQM Workshop, BNL USA, Dec 14-18th, 2009
Lacey Flow
Correlations
Taranenko
Comparison of v2
Ajitanand P-
violation
Now
Thursday – 5:20 PM
Tuesday – 10:20 AM
2
2 4 11 2 cos 2 φ 2 cos 4 φ 2 sin 2 φφ RP RP RP
T
d N v v adp d
3
Why study Flow?
Roy A. Lacey, Stony Brook University; CATHIE-TECHQM Workshop, BNL USA, Dec 14-18th, 2009
Flow measurements give accessto the properties of the new state of matter recently discovered at RHIC
Access:
Direct T, cs, η, ζ, etc Indirect constrains dynamics for determination Crucial for Critical End Point (CEP) search
q̂
Flow studies are indispensible
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The Flow Probe
y
x s/
P ² Bj
2 2
2 2
y x
y x
Primary Control Parameters
, , , sT c FrzOut
20
3
1 1
~ 5 15
TBj
dER dyGeVfm
Flow provides unparalleled access to the transport properties of the medium
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~ 1.25ˆT
s q
( )
1
~ s sTs
KR
c KR Tc
Roy A. Lacey, Stony Brook University; CATHIE-TECHQM Workshop, BNL USA, Dec 14-18th, 2009
2
~q
Reac
tion
plane
XZ
Y
Hydrodynamic
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How are transport coefficients obtained from flow data?
Roy A. Lacey, Stony Brook University; CATHIE-TECHQM Workshop, BNL USA, Dec 14-18th, 2009
There are known known's There are known unknowns There unknown unknowns D. Rumsfeld
Comparisons to viscous
hydrodynamicscalculation
Hydrodynamically inspired fits to
Data
Issues• Data (method, role of non-
flow?)• pre vs. post hadronic contributions • Species dependence• Extraction procedure• Initial conditions (ε)• Fit constraints• etc
Critical path issues are common to all methodologies
6 of 23
No evidence for significant η-dependent non-flow contributionsContributions from the ridge estimated to be small as well
A known known - Flow measurements are robust
3.1 3.9BBC
3.1 3.9MPC
1.5 2.8iRXN
1.0 1.5RXNo
1.0 2.8ioRXN
Event planes
PHENIX Preliminary
Roy A. Lacey, Stony Brook University; CATHIE-TECHQM Workshop, BNL USA, Dec 14-18th, 2009
Central Arms
RXNRXN
BBC/MPC BBC/MPC
Consistent results for v4 / v2 2
ratio using measurements
with respect to the different event planes
PHENIX Preliminary
Central Arms
RXNRXN
BBC/MPC BBC/MPC
Roy A. Lacey, Stony Brook University; CATHIE-TECHQM Workshop, BNL USA, Dec 14-18th, 2009
A known known – Consistency of higher harmonics
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PHENIX Preliminary
Roy A. Lacey, Stony Brook University; CATHIE-TECHQM Workshop, BNL USA, Dec 14-18th, 2009
A known known – agreement between RHIC measurements
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Taranenko will discuss this in detail!
The results from different methods should Not be used as a measure of systematic error!
EP
Issues: different experimental results results from different methods which data set to use ?
There is good agreement between experiments Consideration of fluctuations important when
comparing different methods
9Roy A. Lacey, Stony Brook University;
CATHIE-TECHQM Workshop, BNL USA, Dec 14-18th, 2009
A known known – Energy dependence of v2
~ 50% increase from SPS to RHIC.
Apparent saturation above 62.4 GeV λ= 1 ?
RK
PHENIX Preliminary
PHENIX Preliminary
KET & nq (nq2) scaling validated for v2
as a function of centrality
A known known – Flow scales
PHENIX PreliminaryPHENIX Preliminary
PHENIX Preliminary PHENIX Preliminary
10Roy A. Lacey, Stony Brook University;
CATHIE-TECHQM Workshop, BNL USA, Dec 14-18th, 2009
Au+Au at √sNN = 200 GeV
PHENIX Final Run4PHENIX Preliminary Run7
Minimum bias
van Hees et al.
A known known – Charm flows and scales
Strong coupling η/s - estimate
J/(ccbar) v2 still challenged by statistics
11Roy A. Lacey, Stony Brook University;
CATHIE-TECHQM Workshop, BNL USA, Dec 14-18th, 2009
12 of 23
KET & nq (nq2) scaling validated for v2
(v4)
A known known - universal scaling of harmonic flow at RHIC
Roy A. Lacey, Stony Brook University; CATHIE-TECHQM Workshop, BNL USA, Dec 14-18th, 2009
PHENIX Preliminary
13 of 23
A known known - flow is partonic
Partonic flow dominates!
Demir et alη/s from hadronic phase is very large 10-12x(1/4π)No room for such values!
Roy A. Lacey, Stony Brook University; CATHIE-TECHQM Workshop, BNL USA, Dec 14-18th, 2009
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Sideward's flow depend on particle species
Hadronic flow at lower energies – v1
PRL 85, 940 (2000)PRL 85, 940 (2000)
Roy A. Lacey, Stony Brook University; CATHIE-TECHQM Workshop, BNL USA, Dec 14-18th, 2009
Bleicher et al
15 of 23
NCQ scaling is expected to break at
intermediate pT if pions are mainly from
recombination of TS partons but protons are
mainly from TTS and TSS .
Roy A. Lacey, Stony Brook University; CATHIE-TECHQM Workshop, BNL USA, Dec 14-18th, 2009
A known known – Scaling breaks at high pT
Hwa &Yang arXiv:0801.2183[nucl-th]
A Known Unknown – initial eccentricity
16Roy A. Lacey, Stony Brook University; CATHIE-
TECHQM Workshop, BNL USA, Dec 14-18th, 2009
Geometric fluctuations are very important – be skeptical of any claim that does not include them
eccentricity should be constrained
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What do the fits and model comparisons tell us?
Roy A. Lacey, Stony Brook University; CATHIE-TECHQM Workshop, BNL USA, Dec 14-18th, 2009
Romatschke, Romatschke, & Luzum
pions
PHENIX preliminary data
pT (GeV/c)
v2
Calculations suggest small η/s value
Viscosity required for KET scaling Lower Limit ?
Chaudhuri
18Roy A. Lacey, Stony Brook University;
CATHIE-TECHQM Workshop, BNL USA, Dec 14-18th, 2009
Estimates for η/s
Extracted η/s is small
19Roy A. Lacey, Stony Brook University;
CATHIE-TECHQM Workshop, BNL USA, Dec 14-18th, 2009
Estimates for η/s
Teaney
20Roy A. Lacey, Stony Brook University;
CATHIE-TECHQM Workshop, BNL USA, Dec 14-18th, 2009
Estimates for η/s
C. Gombeaud, J.-Y. OllitraultarXiv:0907.4664, arXiv:0910.0392
Ideal hydro.
Ideal hydro. + fluctuation
Ideal hydro. + fluctuation+ incomplete thermalization
Fluctuations are very important
Relaxation time limits η/s to small values
21Roy A. Lacey, Stony Brook University;
CATHIE-TECHQM Workshop, BNL USA, Dec 14-18th, 2009
Estimates for η/s
v2
pT
G. Denicol et al
22Roy A. Lacey, Stony Brook University;
CATHIE-TECHQM Workshop, BNL USA, Dec 14-18th, 2009
Strategyquantify the viscous
corrections to hydrodynamicsvia a simple fitting procedure, to
obtain K as a function of Npart
Knudsen number parameterization
v2/ε
Npart
Ideal hydrodynamics~ ( )s n sTc K R Tc
s
Obtain from fits to data(viscous correction)
Geometry(from model)
Lattice EOS
With viscosity
Obtain from fits to data(viscous correction)
23Roy A. Lacey, Stony Brook University;
CATHIE-TECHQM Workshop, BNL USA, Dec 14-18th, 2009
Calibration of the method
Methodology successfully proofed – very important
~ ( )s n sTc K RT cs
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New constraints for η/s
T also obtained from the fit!
~ ( )s n sTc K R Tcs
Viscous corrections Grow as :
(Teaney)
Lattice EOS
Geometric
Not an intrinsic property
Roy A. Lacey, Stony Brook University; CATHIE-TECHQM Workshop, BNL USA, Dec 14-18th, 2009
arXiv:0905.4368
25Roy A. Lacey, Stony Brook University; CATHIE-
TECHQM Workshop, BNL USA, Dec 14-18th, 2009
Summary
• PHENIX measurements are robust, pervasive and rife with opportunity for more detailed extraction of transport coefficients.
Care is required for model comparisons.
Current estimates of η/s indicate a small value
PHENIX Preliminary
Non-photonic electron flow
STAR: PRL98(2007) 192301
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“body-body” collisioncollision along the shortest axis
“tip-tip” collisioncollision along the longest axis
U + U
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V4 = k(V2)2 where k is the same for different particle species
v4/(v2)2 ratio for different particle species
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x10
x20
4 1~ 0.1, 0.2, 0.5 3s sT T
QCD Sonic Boom
Same-Side Jet
High pT trigger
**
Gives sound speed directly; Sets upper limit on viscosity.
M
cos M sc
Medium Response & Transport Coefficients
Roy A. Lacey, Stony Brook University; CATHIE-TECHQM Workshop, BNL USA, Dec 14-18th,
2009
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DataSimulated Deflected jet
Simulated Mach Cone
Data compatible with the presence of a away-side Mach Cone
Total 3PC jet correlations
True 3PC jet correlations
QCD Sonic Boom?
1~ 0.4, 24sc s
Roy A. Lacey, Stony Brook University; CATHIE-TECHQM Workshop, BNL USA, Dec 14-18th,
2009