di-hadron correlation and mach-like cone structures in partonic/hadronic transport model
DESCRIPTION
Di-hadron correlation and Mach-like cone structures in partonic/hadronic transport model. Guo-Liang Ma. Shanghai Institute of Applied Physics . Collaborators: S. Zhang, Y. G. Ma, H. Z. Huang, X. Z. Cai, J. H. Chen, Z. J. He, J. L. Long, W. Q. Shen, X. H. Shi et al. Background introduction - PowerPoint PPT PresentationTRANSCRIPT
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Di-hadron correlation and Mach-like Di-hadron correlation and Mach-like cone structures in partonic/hadronic cone structures in partonic/hadronic transport model transport model
Di-hadron correlation and Mach-like Di-hadron correlation and Mach-like cone structures in partonic/hadronic cone structures in partonic/hadronic transport model transport model
Guo-Liang MaGuo-Liang Ma Guo-Liang MaGuo-Liang Ma
Background introductionBackground introduction Model introductionModel introduction Analysis methodAnalysis method Results and discussionsResults and discussions ConclusionConclusion
Collaborators: S. Zhang, Y. G. Ma, H. Z. Huang, X. Z. Cai, Collaborators: S. Zhang, Y. G. Ma, H. Z. Huang, X. Z. Cai, J. H. Chen, Z. J. He, J. L. Long, W. Q. Shen, X. H. Shi et al.J. H. Chen, Z. J. He, J. L. Long, W. Q. Shen, X. H. Shi et al.
Shanghai Institute of Applied Physics Shanghai Institute of Applied Physics
nucl-th/0601012Guo-liang Ma Hard Probes Asilomar 2006
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Di-hadron correlations
pT(assoc) > 2 GeV/c
pT(assoc) > 0.15 GeV/c
4 <
p T(t
rig)
< 6
GeV
/c
Soft associated Soft associated particlesparticles →→ enhancementenhancement
Hard associated Hard associated particles particles →→ suppressionsuppression
Associated particlesOn away side:
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Soft Associated particles on Away side (thermalization)
near sidenear side
away side
thermalization???thermalization???
BROADENEDBROADENED
<pT > from away jets
<pT> from medium decay
SOFTENED
SOFTENED
What happens to a hard probe that traverses a colored medium?
soften + broaden =?= thermalizationthermalization
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Mach-like cone Structurenucl-ex 0510055
PHENIX Preliminary
nucl-ex 0507004
2.5
<p
Ttrigg
er < 4
.0 G
eV
/c x
1.0
<p
Tasso
c<
2.5
Ge
V/c
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Split parameter D
PHENIX QM05
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Wake Effect or “sonic boom” Wake Effect or “sonic boom”
nucl-th/0406018 Stöeckerhep-ph/0411315 Casalderrey-Solana,Shuryak,Teaneynucl-th/0503028 A. K. Chaudhurihep-ph/0503158 Muller,Ruppert
hep-ph/0411341 Armesto,Salgado,Wiedemann
Correlation of Jet with flowing medium Correlation of Jet with flowing medium
Cherenkov gluon radiation Cherenkov gluon radiation
PRL 96, 172302 (2006) Koch, Majumder, X.-N. Wang
Possible interpretations of mach-like cone structure
Θemission= arccos (cs/c)
Θemission= arccos (1/n(p))
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AMPT model
(1) Default AMPT Model (2) Melting AMPT Model
a multi-phase transport model
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(1) Get raw correlation signal in same event.
(2)Get respective background by mixing events in same centrality.
(3)Get correlation by removing background with ZYAM method.
Mix-event Technique
-1 0 1 2 3 4 50
2
4
6
8460
470
480
490
500
510
520
530
1/N
trig
dNch
/d
20-40%
20-40%
PT
trig 3-6GeV/c ,PT
asso 0.15-3GeV/c same event mix event
Background Subtracted signal
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correlationscorrelations from AMPT from AMPT((3<pT
trigger<6GeV/c ,0.15<pTassoc<3GeV/c)
(1) ▲melting version after hadronic rescattering(2) ● melting version before hadronic rescattering(3) ◆ default version after hadronic rescattering(4)★ default version before hadronic rescattering(5) ■ Star Data 0-5% (4-6)*(0.15-4)GeV/c factor=1.58
Au+Au 200GeV (0-10%)
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2 4 6 8 10 120
2
4
6
8
10
12
14
16
18
20
0 1 2 3 410-3
10-2
10-1
100
101
102
PT
trig 3-6GeV/c (AMPT) near away
PT
trig 4-6GeV/c ( STAR data X factor=1.58) near away
impact parameter b (fm)
asso
ciat
ed N
hadr
on
(a)
PT
trig 4-6GeV/c (STAR data X factor=1.58)
0-5% away 0-5% near X 0.1
(b)
PT
trig 3-6GeV/c (AMPT) 0-5% away 0-5% near X 0.1
dNha
dron
/dP
(G
eV/c
)-1
PT (GeV/c)
-2 -1 0 1 20.5
0.6
0.7
0.8
0.9
1.0 AMPT data PT
trig 3-6GeV/c away
STAR data PT
trig 4-6GeV/c away
(0-10%)
<p T>
(Gev
/c)
- (rad)
(c)
0 2 4 6 8 10 12 14
0.7
0.8
0.9
1.0(d) P
T
trig 3-6GeV/c(AMPT) away
PT
trig 4-6GeV/c(STAR data) away
impact parameter b (fm)
<P
T> (
GeV
/c)
Jet remnants’ characters in AMPT Au+Au 200GeV Melting AMPT model
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-0.10.00.10.20.30.40.50.60.70.8
-0.1
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0 1 2 3-0.1
0.0
0.1
0.2
0.3
0.4
0.5
-0.1
0.0
0.1
0.2
0.3
0.4
0.5
10-20% (2.5-4)X(1-2.5)GeV/c melting version after hadron rescattering factor=1/1.75 melting version before hadron rescattering factor=1/1.75 default version after hadron rescattering factor=1/0.7 PHENIX data 10-20% faxtor=1.58
1/N
trigd
N/d
20-40% (2.5-4)X(1-2.5)GeV/c melting version after hadron rescattering factor=1/1.75 melting version before hadron rescattering factor=1/1.75 default version after hadron rescattering factor=1/0.7 PHENIX data 20-40% factor=1.58
1/N
trigd
N/d
(rad)
40-90% (2.5-4)X(1-2.5)GeV/c melting version after hadron rescattering factor=1/1.4 melting version before hadron rescattering factor=1/1.4 default version after hadron rescattering factor=1/0.7 PHENIX data 60-90% factor=1.58
1/N
trigd
N/d
0-10% (2.5-4)X(1-2.5)GeV/c melting version after hadron rescattering factor=1/4.2 melting version before hadron rescattering factor=1/4.2 default version after hadron rescattering factor=1/1.75 default version before hadron rescattering factor=1/1.75 PHENIX data 0-5% factor=1.58
1/N
trigd
N/dMach-like cone Mach-like cone
Structure in Structure in AMPT modelAMPT model correlations in Au+Au 200GeV correlations in Au+Au 200GeV ((2.5<pT
trigger<4GeV/c ,1<pTassoc<2.5GeV/c)
Mach-like cone Mach-like cone Structure in Structure in AMPT modelAMPT model correlations in Au+Au 200GeV correlations in Au+Au 200GeV ((2.5<pT
trigger<4GeV/c ,1<pTassoc<2.5GeV/c)
2 4 6 8 10 120.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
AMPT PT
trig 2.5-4(GeV/c),PT
associated 1-3.(GeV/c) melting version after hadronic rescattering default version after hadronic rescattering
exp. data PT
trig 2.5-4(GeV/c),PT
associated 2-3(GeV/c)split
ing
para
met
er D
(ra
d)
impact parameter b (fm)
D
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Correlations between forward- and mid-rapidity in d+Au collisions
STAR Preliminary
See Fuqiang’s talk
Mid-rapidity
Forward-rapidity
trig.
asso.
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Three-particle correlations in AMPT
mix-event technique background subtracted
3-particle correlation signal
((2.5
<pTtri
gger <
4GeV
/
c ,1<
p Tas
soc <2
.5GeV
/c)
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Three-particle correlation centrality dependence3-particle correlation
density definition:
region
region
dd
ddddNd
21
2121
2
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Parton cascade effect on 2- and 3- particle correlation
(1)Hadronic rescattering (1)Hadronic rescattering mechanism also can mechanism also can produce produce 2- and 3-particle 2- and 3-particle correlation, but it can correlation, but it can not give big enough not give big enough splitting parameters. splitting parameters. (2) Parton cascade (2) Parton cascade mechanism is essential mechanism is essential for describing the for describing the amplitude ofamplitude ofexperimental mach-like experimental mach-like structure.structure.
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Conclusion1) Di-hadron correlations can be produced by a multi-
phase transport model(AMPT).
2) Mach-like structure is born in the partonic process and further developed in hadronic rescattering process.
3) hadronic rescattering mechanism can produce di-hadron correlation, but it can not give big enough splitting parameters.
4) Cone , deflected and center 3-particle correlations all exist in the central Au+Au collisions, however center 3-particle correlation become more dominant with the decreasing of Npart .
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Thanks for
your attentions!