centrality)dependence)of)soq)photon)produc9on)) and)its ... · sanshiro)mizuno)...
TRANSCRIPT
![Page 1: Centrality)Dependence)Of)SoQ)Photon)Produc9on)) and)Its ... · Sanshiro)Mizuno) for)the)PHENIXcollaboraon) University)of)Tsukuba,)RIKEN)) mail)to):)s1230082@u.tsukuba.ac.jp) Centrality)Dependence)Of)SoQ)Photon)Produc9on))](https://reader034.vdocument.in/reader034/viewer/2022050209/5f5b92ecf046602357440f90/html5/thumbnails/1.jpg)
Sanshiro Mizuno for the PHENIX collabora9on University of Tsukuba, RIKEN
mail to : [email protected]
Centrality Dependence Of SoQ Photon Produc9on and Its Collec9ve Flow
in Au+Au Collisions At √sNN=200GeV
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2014/05/19 QM2014 @ Darmstadt 2
What are direct photons ?
Direct photons: all photons except those coming from hadron decays. l Good probe since they penetrate the QGP l Created during all stages of the collision
hard scaEering
(thermal?) radiaHon from QGP
(thermal?) radiaHon from HG
jet-‐photon conversion
Jet fragmentaHon
hadron decay
p T(GeV
/c)
Hme
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2014/05/19 QM2014 @ Darmstadt 3
Previous soP photon results from PHENIX
P.R.L. 109, 122302(2012) P.R.L. 104, 132301(2010)
Min. Bias
There is a large excess with respect to scaled p+p, and very large flow in the 1-‐4 GeV/c region.
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Direct photon puzzle
It is a challenge for models to explain simultaneously the excess of direct photon yield and the large ellip9c flow (v2).
Yield enhancement Suggests early emission when temperature is high at or above 300MeV Large ellipHc flow (v2) Suggests late emission, when temperature is low, collec9ve mo9on is large
Integrated emission differen9al emission
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MoHvaHon
To resolve the puzzle and constrain photon produc9on mechanisms, more differen9al measurements are needed. • Complete centrality dependence • Higher order azimuthal anisotropy In this talk, we’ll extend earlier (published) centrality selec9ons both for yields and v2, and show new results for v3 and v2/v3.
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Centrality dependence of the γdir. yield
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Photons by external conversion MHBD: Real track Mvtx : Measured track
MHB
D[GeV
]
Mvtx[GeV] 7
Published Real photons in EMCal : 1 -‐ 20 GeV/c
large errors at low pT (resolu9on, contamina9on) Virtual photons from e+e-‐ : 1 -‐ 4 GeV/c New method Real photons are measured by e+e-‐ pair from external photon conversion at the HBD readout plane. ü less hadron contamina9on ü good momentum resolu9on pT range : 0.4 ~ 5GeV/c Extended to lower pT low staHsHcs
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Enhancement of the direct photon yield
The yields from p+p data are fifed by extrapolated below 2 GeV/c. Compared with a green line which is expected from p+p data, enhancements are observed.
TAA
=< Ncoll
> /�pp
arXiv:1405.3940
a(1 +pTb
2)c
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Excess photon yield
Excess yield (above expecta9on from scaled p+p) fifed with an exponen9al. The slopes are comparable within uncertain9es.
Ae�pT /Teff
arXiv:1405.3940
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Centrality (Npart) dependence of the yield
Excess of photon yield increases with power-‐law func9on, α=1.48±0.08(stat.)±0.04(sys.) ≈ 3/2 The centrality dependence is not an ar9fact of the very low pT points: same slope as we increase lower limit of integra9on (upper limit is always 2GeV/c). The shape of direct photon pT spectra doesn’t depend on centrality.
P.R.C 89, 044910(2014)
Theory
F = AN↵part
arXiv:1405.3940
Data
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10�5
10�4
10�3
10�2
10�1
100
101
12p
p Td2 N
dpT
dy[(
GeV
/c)�
2 ]
0-20%
(a) Linnyk et al.vHees et al.Shen et al. (KLN)Shen et al. (MCGlb)direct g
20-40%
Au+AupsNN = 200GeV
(b)
0 1 2 3 4
10�5
10�4
10�3
10�2
10�1
100
101
40-60%
(c)
1 2 3 4 5pT [GeV/c]
60-92%
(d)
2014/05/19 QM2014 @ Darmstadt 11
Yield: data vs theories
Linnyk et al.: PHSD transport model; Linnyk, Cassing, Bratkovskaya, P.R.C 89, 034908(2014) vHees et al.: Fireball model; van Hees, Gale, Rapp; P.R.C 84, 054906(2011) Shen et al.: Ohio hydro for two different ini9al condi9ons; Shen, Heinz, Paquet, Gale; P.R.C 84, 064903(2014) The yield itself is s9ll not perfectly described.
arXiv:1405.3940
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γdir. Azimuthal anisotropy
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Flow measurement: the method P.R.L. 109, 122302(2012)
The magnitude of the direct photon v2 is comparable to the hadron (and hadron decay photon) v2. Therefore, Rγ is a crucial component.
⌫dir.n =R�⌫inc.n � ⌫dec.n
R� � 1
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Rγ measured by real and virtual photons
Rγ measured with real (conversion) photons is consistent with the earlier virtual photon measurement.
R� = Ninc./Ndec.
P.R.L. 104, 132301(2010) virtual photon analysis Present data external conversion analysis
arXiv:1405.3940
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Φ3
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Higher order azimuthal anisotropy
Dominant component is v2; v3 comes from par9cipant fluctua9ons, viscosity dampens higher order terms.
Φ2
⌫n =< cos{n(�� �n)} >
dN
d(�� n)= N0[1 + 2
1X
n=1
vncos{n(�� �n)}]
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(GeV/c) T
p0 2 4
3v
0
0.05
0.1 0-60(%)3 v0π
3 vinc.γ
E.P.:RxN(I+O)Au+Au 200GeV
(GeV/c) T
p0 2 4
3v
0
0.05
0.13 vdir.γ
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γdir. v3 measurement
The magnitude of γdir. v3 is similar to π0, a similar trend as a seen in case of v2. Photon azimuthal asymmetries may be affected by expansion of QGP.
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2014/05/19 QM2014 @ Darmstadt 17
(GeV/c) T
p0 2 4
3v
-0.1
0
0.1
0.23 vdir.γ
E.P. : RxN(I+O)
(GeV/c) Tp0 2 4
3v
-0.1
0
0.1
0.2 Au+Au200GeV
(GeV/c) T
p0 2 4
3v
-0.1
0
0.1
0.20-20(%) 20-40(%) 40-60(%)
Centrality dependence of γdir. v3
η range of RxN(I+O) is from 1.0 to 2.8. Non-‐zero, posi9ve v3 is observed in all centrality bins. No strong centrality dependence: similar tendency as for charged hadrons (P.R.L. 107, 252301 (2011)) and π0.
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(GeV/c) T
p0 2 4
3v
-0.1
0
0.1
0.23 vdir.γ 3 v0π
E.P. : RxN(I+O)
(GeV/c) Tp0 2 4
3v
-0.1
0
0.1
0.2 Au+Au200GeV
(GeV/c) T
p0 2 4
3v
-0.1
0
0.1
0.20-20(%) 20-40(%) 40-60(%)
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γdir. and π0 v3 show similar trend
The centrality (in)dependence of γdir. v3 is also observed for π0 v3.
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0.0
0.1
0.2
0.3
v 2gdirect (calorimeter)gdirect (conversions)
Au+AupsNN = 200GeV
RXP(I+O)
0 1 2 3 40.00
0.05
0.10
0.15
v 3
0-20%
0 1 2 3 4pT [GeV/c]
20-40%
0 1 2 3 4
40-60%
2014/05/19 QM2014 @ Darmstadt 19
Comparison of γdir. vn with the two methods
The calorimeter and conversion photon measurements are consistent within systema9c uncertainty. γdir. vn are extended to lower pT, by the conversion photon analysis.
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0 1 2 3 40.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
v 2
gdirect (conversions)gdirect (calorimeter)
vHess et al. (b)vHess et al. (a)Linnyk et al.
0 1 2 3 4pT [GeV/c]
0 1 2 3 4
van Hees et al: P.R.C 84, 054906 (2011) Linnyk et al.: PHSD model, private communica9on
Comparison γdir. v2 with theoreHcal calculaHons
0-‐20% 20-‐40% 40-‐60%
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(GeV/c) T
p0 2 4
3
/v 2v
0
2
4
6 Au+Au200GeV0-20(%)
dir.γ 0πdir.γ/s=0.08 ηMCGlb. ±π/s=0.08 ηMCGlb. dir.γ/s=0.20 ηMCKLM ±π/s=0.20 ηMCKLM
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The raHo of γdir. & π0 v2/v3
So far all uncertain9es are assumed to be uncorrelated. The ra9os – both for π0 and γ – slightly prefer lower η/s values.
Theory curves: private communica9on by Ch. Shen, Ch. Gale, J.-‐F. Paquest, U. Heinz as in 1403.7558, Calculated for RHIC.
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Summary SoQ photons are expected to do provide important keys to understand photon produc9on mechanisms and medium proper9es, including viscosity. Centrality dependence of direct photon yield The shape of pT spectra doesn’t have strong centrality dependence. The excess of yield increases with centrality like with α≈1.48. 3rd order Azimuthal anisotropy Direct photon has as large v3 as hadrons, which is similar to the case of v2. Non-‐zero, posi9ve direct photon v3 is observed in all centrality bins. Direct photon is expected to be a viscometer of QGP.
N↵part
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Posters for direct photon from PHENIX
SystemaHc studies of the centrality dependence of soP photon producHon in Au+Au collision with PHENIX photon measurement with external photon conversion method Benjamin BANNIER (G-‐01) Direct photon collecHve flow in Au+Au collisions at √sNN=200GeV Direct photon v3 measurement by real photon with Calorimeter Sanshiro MIZUNO (H-‐20)
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The detector informaHon
Central Arm: Measure electrons and photons |η| < 0.35 Reac9on Plane Detector (RxN): Es9mate Event Plane Inner : 1.5 < |η| < 2.8 Outer : 1.0 < |η| < 1.5 MPC: Es9mate Event Plane 3.1 < |η| < 3.8 BBC: Es9mate Event Plane 3.1 < |η| < 3.9
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External conversion photon 1) real photon converts to e+e-‐ in HBD backplane 2) default assump9on: track come from the vertex 3) momentum of the conversion tracks will be mis-‐measured (see black tracks) 4) apparent pair-‐mass (about 12MeV) will be measured for phtons 5) assume the same tracks originate in the HBD backplane 6) re-‐calculate momentum and pair mass with this “alternate tracking model” 7) for true converted photons Matm will be around zero
Real track esHmated track
MHB
D[GeV
]
26 Mvtx[GeV]
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Ncoll-‐scaled pp fit external conversion pp virtual photon pp in EMCal(Run2003 data) pp in EMCal(Run2006 data) AuAu in EMCal(Run2004 data) AuAu from virtual photon(Run4 data) Using external photon conversion method achieved good agreement with previous results.
Comparable measurement is achieved
Au+Au
Min. Bias
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The table of excess of direct photon yield
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Centrality (Npart) dependence of yield P.R.C 89, 044910(2014)
Theore9cal calcula9on of excess of the photon yield.
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The analysis informaHon
γdir. vn with external conversion photon analysis charged π vn γinc. vn with external conversion photon analysis Rγ with external conversion photon analysis γdir. vn with Calorimeter π0 vn with Calorimeter γinc. vn with Calorimeter Rγ with external conversion photon analysis
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Comparison γdir. v3
(GeV/c) T
p0 2 4
3v
0
0.05
0.1
0-60(%) (RxN(I+O))3 vdir.γ
Au+Au200GeV
(GeV/c) T
p0 2 4
3v
0
0.05
0.1
0-60(%) (RxN(In)+MPC)3 vdir.γ
Au+Au200GeV
RxN(I+O) : 1.0 <|η|< 2.8 RxN(In)+MPC : 1.5 <|η|< 3.8 The magnitude of v3 is comparable.
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Centrality (%)
It is known that they have weak correla9on. It is considered that 3rd order of Event Plane is defined as a deforma9on of ini9al geometry.
< cos {6(�A3 � �
B2 )} >
2nd and 3rd order E.P. correlaHon
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Comparison of inclusive photon vn
Inclusive photon vn is measured via conversion photon, and pT range is extended to low pT region.
(GeV/c) T
p0 1 2 3 4
2v
0
0.1
0.2 (RxN(I+O))2 vinc.γ
real photonexternal conversion photon
(GeV/c) T
p0 1 2 3 4
3v
0
0.1
0.2 (RxN(I+O))3 vinc.γ
real photonexternal conversion photon
(GeV/c) T
p0 1 2 3 42v
0
0.1
0.2Au+Au 200GeVAu+Au 200GeV
(GeV/c) T
p0 1 2 3 4
3v
0
0.1
0.2(GeV/c)
Tp0 1 2 3 4
2v
0
0.1
0.2
(GeV/c) T
p0 1 2 3 4
3v
0
0.1
0.2
0-20(%) 20-40(%) 40-60(%)0-20(%) 20-40(%) 40-60(%)
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The table of systemaHc uncertainty of γdir. v3
They are the rela9ve value of systema9c uncertainty propagated to γdir. v3. π0, γinc. and Rγ is considered to be independent for harmonics.
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P.R.L. 107, 252301(2011)
v3 and v4 have weak centrality dependence while v2 has strong. It indicates v3 and v4 are created by the ini9al geometry deforma9on.
v2
v3
v4
Measurement of higher order vn
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arXiv:1212.3995v2
v2
Similar trend with RHIC-‐PHENIX is observed by LHC-‐ALICE.
γdir. measurement by ALICE