space-time picture and bulk observables in relativistic heavy ion...
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![Page 1: Space-time picture and bulk observables in relativistic heavy ion …theor.jinr.ru/~klopot/slides/Sinyukov.pdf · 2019-07-17 · Yu.M. Sinyukov (BITP, Kiev) Seminar BLTP 6 June ,](https://reader033.vdocuments.us/reader033/viewer/2022042320/5f0a294c7e708231d42a4ec7/html5/thumbnails/1.jpg)
Yu.M. Sinyukov (BITP, Kiev)
Seminar BLTP 6 June , 2019
Space-time picture and bulk observables in relativistic heavy ion collisions
(HydroKinetic approach)
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The initial huge kinetic energy of colliding nuclei converts into masses of the final observed particles (several tens of thousands) + the energy of collective flow
The stages of the matter evolution in A+A collisions
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Integrated HydroKinetic Model: HKM iHKM
3
HYDRO
HADRONOZATION
HADRON CASCADE (UrQMD)
Pre-thermal stage
Tp ~ 156 - 165 MeV
r
t
¿th = 1 fm
¿0 = 0:1 fm
¿p
Complete algorithm incorporates the stages: • generation of the initial states: (MC Glaub & CGC) • thermalization of initially non-thermal matter; • viscous chemically equilibrated hydrodynamic expansion; • particlization of expanding medium in the hadronization area ; • a switch to UrQMD cascade with near equilibrium hadron gas as input; • simulation of observables.
Yu.S., Akkelin, Hama: PRL 89 (2002) 052301; … + Karpenko: PRC 78 (2008) 034906; Karpenko, Yu.S. : PRC 81 (2010) 054903; … PLB 688 (2010) 50; Akkelin, Yu.S. : PRC 81 (2010) 064901; Karpenko, Yu.S., Werner: PRC 87 (2013) 024914; Naboka, Akkelin, Karpenko, Yu.S. : PRC 91 (2015) 014906; Naboka, Karpenko, Yu.S. PRC 93 (2016) 024902. .
The initial (non-equilibrium) state
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Bulk Observables, “Soft Physics” measurements
r
Z
t
A
A
πpK
p=(p1+ p2)/2
q= p1- p2 QS correlation function
Tch and μch soon after hadronization (chemical f.o.)
Radial flow
Landau, 1953
Inverse of spectra slope
Radii Ri , i=Long, Side, Out
3D geometrical system sizes
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The is OK at but at different max initial energy densities
when other parameters change: The two values of the shear viscosity to entropy is used for comparison:
The basic result (selected by red) is compared with results at other parameters, including viscous and ideal pure thermodynamic scenarios (starting at without pre-thermal stage but with subsequent hadronic cascade).
The iHKM parameters (at Laine-Shroeder EoS example)
2
Slope of the pion spectra
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The is OK at but at different max initial energy densities
when other parameters change: The two values of the shear viscosity to entropy is used for comparison:
The basic result (selected by red) is compared with results at other parameters, including viscous and ideal pure thermodynamic scenarios (starting at without pre-thermal stage but with subsequent hadronic cascade).
No dramatic worsening of the results happens if simultaneously with changing of parameters/scenarios renormalize maximal initial energy density .
The iHKM parameters (at Laine-Shroeder EoS example)
2
Slope of the pion spectra
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The sensitivity of the results to the model parameters
7 The variation EoS (and the corresponding hadronization temperature) can be compensated to get the same bulk results by . Initial time and are main param.
+
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Interferometry microscope (Kopylov, Podgoretcky: 1971-1973 )
The idea of the correlation femtoscopy is based on an impossibility to distinguish between registered particles emitted from different points because of particle identity.
R a b
detector 1 2
p1 p2
r1
r2
r3
x1
x2
x3
xa
xb
2
1 |qi|
D Momentum representation
Probabilities: q 1/Ri
The model of independent particle emission
for bosons
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THE DEVELOPMENT OF THE FEMTOSCOPY (Yu.S.1986 – 1995)
To provide calculations analytically one should use the saddle point method and Boltzmann approximation to Bose-Einstein distribution function. Then the single particle spectra are proportional to homogeneity volume:
and just these homogeneity lengths forms exponent in Bose-Einstein correlation function
p1 p2
q=p1-p2=(qout, qside, qlong)
L
RT lL lT
Interferomerty radii:
QGP RHIC HBT PUZZLE
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Correlation femtoscopy of nucleus-nucleus collisions
The theory, method and interpretation of the correlation femtoscopy measurements that are utilized by all the collaborations dealing with such kind of analysis in A+A and p+p
collisions at the SPS, RHIC та LHC, are developed. It allows to study the homogeneity lengths in extremely inhomogeneous fast expanding hadron and quark-gluon systems,
with accuracy 10–15 m and 10–23 s.
1987
Femto “homogeneity lengths”.
The general interpretation of the femtoscopy scales as the spatio-
temporal homogeneity length has been formulated
“Bowler–Sinyukov treatment”
The method that allow to sepa- rate the quantum-statistical (QS) correlations from Coulomb ones and long-lived (l-l) resonance contributions is proposed
«Sinyukov-Makhlin formula” that allow to measure the life-time of the hot matter at “Little
bang”
),),(
0
02
( pfpxf
xix
i ′′=λ
2015 - fraction of l-l resonances - Coulomb wave function. - QS-кореляційна ф. - mean transv. velocity
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HKM iHKM
Evolution of ideas and main femtoscopy results
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Initial flows and Ro/Rs ratio (t0=1-2 fm/c)
Yu.S. Act.Phys. Polon. B 37 (2006) 3343
Freeze-out hypersurfaces in transverse 1D projection)
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Emission functions in HKM for top SPS, RHIC and LHC energies
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HKM prediction: solution of the HBT Puzzle
Quotations: HKM
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HKM iHKM
Femtoscopy scales vs multiplicity and initial system size
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Interferometry volume Vint in LHC p-p and central Au-Au, Pb-Pb collisions
without post-hydro hadron cascade
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Interferometry volume Vint in LHC p-p and central Au-Au, Pb-Pb collisions
iHKM
Vint(A; dN=dy)
iHKM
Akkelin, Yu.S. : PRC 70 064901 (2004); PRC 73 034908 (2006)
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Interferometry volume Vint in LHC p-p and central Au-Au, Pb-Pb collisions
iHKM
Vint(A; dN=dy)
iHKM
iHKM with uncertainty principle
Akkelin, Yu.S. : PRC 70 064901 (2004); PRC 73 034908 (2006)
Yu.S., Shapoval: PRD 87, 094024 (2013)
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M. Adzhimambetov, Yu.S. , 2019 in preparation
Interferometry volume vs initial overlapping area at the fixed multiplicity
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The femtoscopy radii at different energies and the same multiplicity
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Femtoscopy volume vs initial transverse overlapping area of creating systems
Initial transverse size ST = effective transverse aria of overlapping nuclei at the initial stage of
collision process
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Rside
Data from ALICE, 2015
Pions
Naboka, Karpenko, Yu.S. PHYS REV C 93, 024902 (2016)
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Rout
Data from ALICE, 2015
Pions
Naboka, Karpenko, Yu.S. PHYS REV C 93, 024902 (2016)
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Rlong
Data from ALICE, 2015
Pions
Naboka, Karpenko, Yu.S. PHYS REV C 93, 024902 (2016)
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iHKM
Femtoscopy scales: pions vs kaons
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Sep. 2015 , L.V. Malinina
QM2015, Kobe, Japan
K±K± and K0 K0 s s
in Pb-Pb: HKM model
New results from ArXiv.org:1506.07884
R and λ for π±π±, K±K±, K0 K0 , pp s s
for 0-5% centrality Radii for kaons show good agreement
with HKM predictions for K±K±
(V. Shapoval, P. Braun-Munzinger, I. Karprenko Yu. Sinyukov Nucl.Phys.A929 (2014))
λ decrease with k , both data and HKM T
HKM prediction for λ slightly overpredicts the data
Λπ are lower λK due to the stronger
influence of resonances
L.V. Malinina Quark Matter, Japan ALICE Coll. Phys. Rev. C 96 … (2017)
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Comparison with HKM for 0-5% centrality
HKM model slightly underestimates R side
overestimates R_side /R_out
HKM model with re-scatterings (M. Shapoval, P. Braun-Munzinger, Iu.A. Karpenko, Yu.M. Sinyukov, Nucl.Phys. A 929 (2014) 1.) describes well ALICE
π & K data.
HKM model w/o re-scatterings demonstrates
approximate mT scaling
for π & K, but does not describe ALICE π & K data
The observed deviation
L.V. Malinina
from mT scaling is explained in
( M. Shapoval, P. Braun-Munzinger, Iu.A. Karpenko, Yu.M. Sinyukov,
Nucl.Phys. A 929 (2014) by essential transverse flow
& re-scattering phase.
ALICE Coll. Phys. Rev. C 96 … (2017) Quark Matter, Japan
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3D K±K± & ππ radii versus k T Pion results from ArXiv.org:1507.06842
Radii scale better with kT than mT according to HKM (V. Shapoval, P. Braun-Munzinger, Iu.A. Karpenko, Yu.M. Sinyukov, Nucl.Phys. A 929 (2014) 1);
Similar observations were reported by PHENIX at RHIC (arxiv:1504.05168).
R R out side R long
L.V. Malinina ALICE Coll. Phys. Rev. C 96 … (2017) Quark Matter, Japan
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Predictions for the pion and kaon femtoscopy scales for LHC energy per nucleon pair 5.02 TeV
The iHKM prediction of the charged pion and kaon interferometry radii k_T dependence for the centrality c=0-5 %. The calculations were
performed at the two hadronization temperatures:
165 MeV and 156 MeV.
Yu.S. , Shapoval, arXiv:1809.07400 for Phys.Rev. C (2019)
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Space-time picture of the pion and kaon emission
From Yu.S., Shapoval, Naboka, Nucl. Phys. A 946 (2016) 247 ( arXiv:1508.01812)
w/o transv. expansion
where
2015 1987 1995
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Extraction of emission time from fit R long T
Indication: τ < τ . Possible explanations ( arxiv:1508.01812 ): HKM includes re- π K
scatterings (UrQMD cascade): e.g. Kπ→K*(892)→Kπ, KN→K*(892)X; (K*(892) lifetime 4-5 fm/c) [πN→N*(Δ)X, N*(Δ)→πX (N*s(Δs)- short lifetime)]
The new formula for extraction of the maximal emission time for the case of strong transverse flow was used ( Yu. S., Shapoval, Naboka, Nucl. Phys. A 946 (2016) 227 )
The parameters of freeze-out: T and “intensity of transverse flow” α were fixed
by fitting π and K spectra ( arxiv:1508.01812 )
To estimate the systematic errors: T = 0.144 was varied on ± 0.03 GeV & free α , α , were used; systematic errors ~ 1 fm/c π K
L.V. Malinina ALICE Coll. Phys. Rev. C 96 … (2017) Quark Matter, Japan
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M. Adzhimambetov, V. Shapoval, Yu.S., Nucl.Phys. A 987 (2019) 321–336.
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K* probes K*(892) life time is 4.2 fm/c
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radiation picture in iHKM. V.Shapoval, P.Braun-Munzinger, Yu.S. Sudden vs continuous thermal freeze-out at the LHC. Nuclear Physics A 968 (2017) 391
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radiation picture in iHKM. Sudden vs continuous thermal freeze-out at the LHC.
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Less than 30% of direct K* can be seen till 15 fm/c
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Suppression of due to continuous thermal freeze-out (LHC)
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70% - 20% = 50% Therefore
at least 50% of direct K*0 are recreated in reactions:
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Spectra of (LHC)
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Summary for space-time structure of ultrarelativistic A+A collisions
It seems that we understood in detail the femtoscopic picture of ultrarelativistic A+A collisions at the top RHIC and available LHC energies.
The dependence of the interferometry volume on both main parameters, namely, multiplicity and
initial size of the system formed, is obviously demonstrated.
As for the complete space-time picture of collision process , the femoscopy analysis altogether with probes demonstrate that even at the first 4-5 fm/c (proper time!) after hadronization at least 70% of decay products are re-scattered. The intensive re-generation
of K* takes place. At least 50% of direct are re-combine. Quite intensive “afterburner life” at the last hadron evolution stage, leads not only to violation of kaon-pion femtoscopy mT – scaling, but also to continuous “chemical freeze-out”
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Space-time picture of the particle production
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Thermal and evolutionary approaches
Yu.S., V. Shapoval,
Phys. Rev. C 97 064901 (2018)
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Thermal models of particle production vs dynamic/evolutionary approaches
44
Continuous freeze-out vs sudden freeze-out
Kinetic/thermal freeze-out Sudden freeze-out
Cooper-Frye prescription
Continuous freeze-out
The is peace of hypersurface where the particles with momentum near has a maximal emission rate. Yu.S.
Chemical freeze-out
The is typically isotherm.
The numbers of quasi-stable particles is defined from Ni with taking into account the
resonance decays but not inelastic re-scattering.
The is the minimal temperature when the expanding system is still (near) in local thermal and chemical equilibrium. Below the hadronic cascade takes place: . The inelastic reactions, annihilation processes in hadron-resonance gas change the quasi-particle yields in comparison with sudden chem. freeze-out.
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Equation of State - 1
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Equation of state -2
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47
Thermal models vs evolutionary approach
Evolutionary models Basic matter properties: thermodynamic EoS
High dense matter formation time
Max. energy density
Thermal models
Chemical freeze-out at
Particle number ratios
At the particlization temperature hydrodynamic evolution transforms (suddenly or continuously) into interact. hadron gas evolution
L.-S. Karsch (lattice QCD) 0.15 fm/c fm/c
GeV/fm3 495 GeV/fm3
EoS: iHKM
Kinetic freeze-out «Blast-wave” parametrization of
freeze-out hypersurface and transverse flows on it. Spectra
Kinetic freeze-out is continuous, lasts more than 5 fm/c. “Effective temperature” of maximal emission: .
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Multiplicity dependence of all charged particles on centrality and spectra for LHC energy
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Particle number ratios at the LHC 2.76 TeV/n.p., Lattice QCD EoS Yu.S. , Shapoval,
Phys. Rev. C 97 064901 (2018)
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Particle number ratios at the LHC, 2.76 TeV, L-S EoS
50 Yu.S. , Shapoval, Phys.Rev. C (2018)
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Particle number ratios at the LHC, 5.02 TeV/n.p.
51
Yu.S. , Shapoval, arXiv:1809.07400 (will be published in
Phys.Rev. C (2019)].
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Particle yields at LHC, 5.02 TeV/n.p.
52
Yu.S. , Shapoval, arXiv:1809.07400 (will be published in
Phys.Rev. C (2019)].
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Particle ratios at LHC, 5.02 TeV/n.p.
53
Yu.S. , Shapoval, arXiv:1809.07400 (will be
published in Phys.Rev. C (2019)].
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Spectra at LHC 5.02 TeV/n.p
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Elliptic flow LHC 5.02 TeV/n.p.
55
Yu.S. , Shapoval, arXiv:1809.07400 (will be
published in Phys.Rev. C (2019)].
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Asymmetric n-flow LHC 5.02 TeV/n.p.
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M. Adzhimambetov, V. Shapoval, Yu.S., Nucl.Phys. A 987 (2019) 321–336.
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Au+Au, top RHIC energy
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Au+Au, top RHIC energy
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Au+Au, top RHIC energy
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Au+Au, top RHIC energy
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Au+Au, top RHIC energy
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Au+Au, top RHIC energy
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Spectra of strange baryons, , on centrality
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Summary on the particle production Neither thermal nor chemical freeze-out cannot be considered as sudden at some corresponding temperatures. Particle yield probe as well as absolute values !) demonstrate that even at the minimal hadronization temperature MeV, the annihilation and other non-elastic scattering reactions play role in formation particle number ratios, especially. It happens that the results for small and relatively large are quite similar. It seems that inelastic processes (other than the resonance decays), that happen at the matter evolution below , , play a role of the compensatory mechanism in formation of . . Chemical freeze-out is continuous. The iHKM works perfectly not only at LHC but also at RHIC energies and describes well spectra of pion, kaon, proton, antiprotons, Lambdas, Omega, Cascade, different particle number ration? Elliptic flow and femtoscopy scales. For this aim non-sero baryon chemical potential is introduced as well as . The latter depends on the proper life-time of QGP, which is calculated in the iHKM.
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iHKM
DIRECT PHOTONS
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Blow up text
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Photon radiation in iHKM
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HYDRO
HADRONOZATION
HADRON CASCADE (UrQMD)
Pre-thermal stage
Tp ~ 156 - 165 MeV
r
t
¿th = 1 fm
¿0 = 0:1 fm
¿p
• generation of the initial states: (MC Glaub & CGC)
PROMPT PHOTONS • thermalization of initially non-thermal matter; PRE-THERMAL PHOTONS • viscous chemically equilibrated hydrodynamic expansion; THERMAL PHOTONS FROM QGP • hadronization of expanding medium HADRONIZATION EMISSION • hadron matter expansion
THERMAL PHOTONS FROM HADRONIC STAGE
The initial (non-equilibrium) state
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Direct photons. Transverse Spectra
We claim that a description of photon spectra and its
anisotropy could be significantly improved if an
additional photon radiation, that accompanies the presence of deconfined environment, is included.
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Photon puzzle: Anisotropy of spectra, large v2 coefficients.
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Photons at RHIC
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European Physical Journal A - Manuscript ID EPJA-104987.R1
arXiv:1812.02763
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Spectra: Photons at RHIC, c. 10-20 %
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Contributions to photon spectra, c. 0-20%
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Spectra: Photons at RHIC, c. 20-40 %
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Spectra: Photons at RHIC, c. 40-60 %
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Photons at RHIC, v2 , c. 10 – 20 %
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Photons at RHIC, v2 , c. 20 – 40 %
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Photons at RHIC, v2 , c. 40 – 60 %
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Triangular flow, v_3 coefficients, c. 0-20%
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Triangular flow, v_3 coefficients, c. 20-40%
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Triangular flow, v_3 coefficients, c. 40-60%
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Summary for photons
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Acknowledgement
85
Thank you for your attention