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Jet - flow(v2) correlation
ShinIchi Esumi
Inst. of Physics, Univ. of Tsukuba
v2 - RAA
hydro, Nquark scaling
energy loss, re-distribution
di-hadron correlation
mach-cone like shape
reaction plane dependence
left-right asymmetry
forward-backward asymmetry
2009/Sep/15, flow workshop, ECT* Trento
ShinIchi Esumi, Univ. of Tsukuba
1
Elliptic flow (v2)
QM06
STAR preliminary
Phys. Rev. Lett. 99, 052301 (2007)
hydro-model success
quark degree of freedom
high pT suppression from energy loss
re-distribution of the lost energy
2009/Sep/15, flow workshop, ECT* Trento
ShinIchi Esumi, Univ. of Tsukuba
2
Hadron large suppression
Direct  NO suppression
2009/Sep/15, flow workshop, ECT* Trento
ShinIchi Esumi, Univ. of Tsukuba
3
Jet suppression modification
with 2-particle  correlation
RHIC 200GeV
RHIC 62GeV
SPS 17GeV
PHENIX
nucl-ex/0611019
S.Kniege, ISMD 2007
2009/Sep/15, flow workshop, ECT* Trento
ShinIchi Esumi, Univ. of Tsukuba
4
h-h correlation at “p+p 200GeV” vs “Au+Au 200GeV central 0-20%”
trigger pT window
associate pT window
2009/Sep/15, flow workshop, ECT* Trento
ShinIchi Esumi, Univ. of Tsukuba
5
RP dependent correlations
QM09, C. H. Chen
near-side
away-side
QM04: STAR
in-plane
2009/Sep/15, flow workshop, ECT* Trento
out-of-plane
ShinIchi Esumi, Univ. of Tsukuba
6
QM09, W. G. Holzmann
Head
Shoulder
head: yield confirms simple picture of energy loss
vs. path length; in- and out-of-plane show similar
away-side width
shoulder: geometry effects harder to disentangle
2009/Sep/15, flow workshop, ECT* Trento
ShinIchi Esumi, Univ. of Tsukuba
7
QM09, S. Esumi
ASSO-TRIG<0
Trigger angle selected with
respect to the 2nd moment
event plane [p/2,p/2] to probe
the participant geometry
mach-cone
(shoulder region)
ASSO-TRIG<0
thick side
If trigger angle is fixed around +/(p/4), the associate
particles emitted left or right w.r.t. trigger direction would
feel the different thickness of the almond. It is because
the almond shaped medium is asymmetric w.r.t. jet axis.
2009/Sep/15, flow workshop, ECT* Trento
p
0
ASSO  TRIG
ShinIchi Esumi, Univ. of Tsukuba
p
8
c2(data) - c2(flow)
Angle (4)/(5) (mid-central)
200GeV Au+Au -> h-h (run7)
left/right asymmetry
(pTTrig=2~4GeV/c, pTAsso=1~2GeV/c)
mid-central : 20-50%
(5) s=[0,1]p/8
(4) s=[-1,0]p/8
(1)
right
left
(8)
(2)
(7)
(3)
(6)
(4)
(5)
(5)
(4)
(6)
left
in-plane
(3)
(7)
(2)
(8)
(1)
right
s = Trig.  R.P.
[p/p/]
PHENIX preliminary
in-plane
associate
regions
  Asso.  Trig. (rad)
2009/Sep/15, flow workshop, ECT* Trento
ShinIchi Esumi, Univ. of Tsukuba
9
c2(data) - c2(flow)
Angle (3)/(6) (mid-central)
200GeV Au+Au -> h-h (run7)
left/right asymmetry
(pTTrig=2~4GeV/c, pTAsso=1~2GeV/c)
mid-central : 20-50%
(6) s=[1,2]p/8
(3) s=[-2,-1]p/8
(1)
right
left
(8)
(2)
(7)
(3)
(6)
(4)
(5)
(5)
(4)
(6)
left
in-plane
(3)
(7)
(2)
(8)
(1)
right
s = Trig.  R.P.
[p/p/]
PHENIX preliminary
in-plane
associate
regions
  Asso.  Trig. (rad)
2009/Sep/15, flow workshop, ECT* Trento
ShinIchi Esumi, Univ. of Tsukuba
10
(4) s=[-1,0]p/8
(5) s=[0,1]p/8
200GeV Au+Au -> h-h (run7)
(pTTrig=2~4GeV/c, pTAsso=1~2GeV/c)
mid-central : 20-50%
c2(data) - c2(flow)
in-plane
trigger selection
(3) s=[-2,-1]p/8
(6) s=[1,2]p/8
(1)
in-plane
associate
regions
(8)
(2)
(7)
(3)
(6)
(4)
(5)
(5)
(4)
(2) s=[-3,-2]p/8
(7) s=[2,3]p/8
(6)
in-plane
(3)
(7)
(2)
(8)
(1)
s = Trig.  R.P.
[p/p/]
(1) s=[-4,-3]p/8
(8) s=[3,4]p/8
out-of-plane
trigger selection
average
PHENIX preliminary
Trigger angle selected curves are
shifted up by constant offsets,
dashed average lines are overlaid.
  Asso.  Trig. (rad)
2009/Sep/15, flow workshop, ECT* Trento
ShinIchi Esumi, Univ. of Tsukuba
11
200GeV Au+Au -> h-h (run7)(pTTrig=2~4GeV/c, pTAsso=1~2GeV/c)
mid-central : 20-50%
(5)
(4)
(6)
(3)
(7)
(2)
(8)
(1)
peripheral : 50-93%
average
out-of-plane
in-plane
central : 0-20%
Black dashed line is same as the bottom average.
PHENIX preliminary
2009/Sep/15, flow workshop, ECT* Trento
  Asso.  Trig. (rad)
ShinIchi Esumi, Univ. of Tsukuba
12
Fitted data with
3 Gauss func.
(4) s=[-1,0]p/8
(5) s=[0,1]p/8
200GeV Au+Au -> h-h (run7)
(pTTrig=2~4GeV/c, pTAsso=1~2GeV/c)
c2(data) - c2(flow)
mid-central : 20-50%
in-plane
trigger selection
(3) s=[-2,-1]p/8
(6) s=[1,2]p/8
FNear
FAway+ Faway
Asso.  Trig. (rad)
(2) s=[-3,-2]p/8
(7) s=[2,3]p/8
Fitting with 3 Gaussian functions
Gauss function : F(height, mean, width)
FNear(A0, D0, S0) + FAway+(A+ , D+ , S+)
+ FAway(A , D , S)
| p  D+ | = | D  p | ,
S+= S
(1) s=[-4,-3]p/8
(8) s=[3,4]p/8
out-of-plane
trigger selection
average
PHENIX preliminary
2009/Sep/15, flow workshop, ECT* Trento
significant
  Asso.  Trig. (rad)
ShinIchi Esumi, Univ. of Tsukuba
not significant compared
with systematic errors
13
2009/Sep/15, flow workshop, ECT* Trento
ShinIchi Esumi, Univ. of Tsukuba
14
(1)
(8)
(2)
Simulation
(7)
(6)
(3)
(4)
(5)
(5)
(4)
(6)
4 different jet shape assumptions for MC input
(3)
(7)
(2)
(8)
(1)
jet shape #1
jet shape #2
near- and awayside dependence
only away-side
dependence
jet shape #3
only near-side
dependence
jet shape #4
no R.P.
dependence
ASSO  TRIG (rad)
2009/Sep/15, flow workshop, ECT* Trento
ShinIchi Esumi, Univ. of Tsukuba
15
nTrig / eve (soft) = 3
nAsso / eve (soft) = 8
nJet / eve (hard) = 1
nPTY / jet (hard) = 1.25
jet shape #1
v2,4Trig (soft) = 0.2, 0.029
v2,4Asso (soft) = 0.13, 0.010
v2,4Jet (hard) = 0.2, 0.0
v2,4PTY (hard) = 0.15, 0.0
jet shape #2
Comparison with data would tell
us that there should be nearand away-side modification in
experimental data.
jet shape #3
Simulation
jet shape #4
There should also be a strong effect on v2 , much stronger effect on v4.
This gives natural explanation to the trigger particle bias on the associate v2.
v2(high)=0.20 ---> 0.20
v4(high)=0.029 ---> 0.022
v2(low)=0.13 ---> 0.15
v4(low)=0.010 ---> 0.016
v2(high)=0.20 ---> 0.20
v4(high)=0.029 ---> 0.022
v2(low)=0.13 ---> 0.14
v4(low)=0.010 ---> 0.014
v2(high)=0.20 ---> 0.20
v4(high)=0.029 ---> 0.022
v2(low)=0.13 ---> 0.13
v4(low)=0.010 ---> 0.012
v2(high)=0.20 ---> 0.20
v4(high)=0.029 ---> 0.022
v2(low)=0.13 ---> 0.12
v4(low)=0.010 ---> 0.009
ASSO  TRIG (rad)
2009/Sep/15, flow workshop, ECT* Trento
ShinIchi Esumi, Univ. of Tsukuba
16
QM09, B. Betz
2009/Sep/15, flow workshop, ECT* Trento
ShinIchi Esumi, Univ. of Tsukuba
17
Bin 5
J.Jia, R.Wei, S.Esumi, arXiv:0903.3263
If the multiplicities
reduces with the path
length because of
absorption...
Bin 0
Note: original jets are
generated according
to Ncoll profile
Mach cone 2
kT smearing included,
modified mach-cone by
absorption according to
Eloss. The asymmetry is
now flipped.
punch through jets included,
smeared with R.P. resolution
cone1
cone2
ASSO  TRIG (rad)
2009/Sep/15, flow workshop, ECT* Trento
ShinIchi Esumi, Univ. of Tsukuba
18
AMPT (v1.11, parton cascade with string melting v2.11) Au+Au at sqrt(sNN)=200GeV
(1)
(8)
(true) reaction plane aligned correlation function
(2)
(7)
Similar trend as
seen in experiment
(6)
(3)
(4)
(5)
(5)
(4)
(6)
(3)
(7)
(2)
(8)
(1)
trend is reversed
4~18%
b = 3.5~7 (fm)
perfect R.P. resolution
no v2 subtraction needed
2009/Sep/15, flow workshop, ECT* Trento
44~%
b = 10.5~ (fm)
Asso.  Trig. (rad) with trigger angle selected w.r.t. R.P.
(pTAsso. : 0.5~1.5GeV/c
pTTrig. : 1.5~5.0GeV/c)
ShinIchi Esumi, Univ. of Tsukuba
19
Both near/away shapes show a strong v2
(in-plane preference) as well as a strong
left/right asymmetry (in-plane preference)
QM09 STAR
Ridge/Mach-cone like correlated pairs have been
known to show similar properties as bulk in terms
of inverse slope (apparent temperature) and
particle ratios (Baryon/Meson)
200GeV Au+Au 20-60% (pTTrig=3~4GeV/c, pTAsso=1~1.5GeV/c, >0.7, Trig-R.P.<0)
QM08 STAR
3<pTtrig<4, 1.5<pTtrig<2.0 GeV/c
Jet does not depends on it
Jet reduces v2
Jet
Ridge+Mach cone shape depends on R.P. angle.
Ridge+Mach cone (away side ridge) is a source of of v2
Ridge
STAR Preliminary
parallel aligning of several di-jets with
R.P. because of almond geometry + Eloss.
2009/Sep/15, flow workshop, ECT* Trento
ShinIchi Esumi, Univ. of Tsukuba
20
3-particle correlation “12 vs 13”
jet
*=0
d+Au
Collisions
p
p
q*=p
Deflected Jets
Au
Au
Cone like Jets
PHENIX Preliminary
(1-2)/2
PHENIX Preliminary
Au+Au
Central 0-12%
Both measurements prefer
Mach-cone scenario.
Cone angle (radians)
No pT dependence, too.
STAR Preliminary
STAR Preliminary
2009/Sep/15, flow workshop, ECT* Trento
(1-2)/2
pT (GeV/c)
ShinIchi Esumi, Univ. of Tsukuba
21
forward-backward asymmetry
0

left-right asymmetry
y
x
z
2009/Sep/15, flow workshop, ECT* Trento
ShinIchi Esumi, Univ. of Tsukuba
22
,Jet,p0 - hadron
correlation
RHIC-AGS’09, Y. S. Lai
Comparisons are
the most important!
STAR Preliminary
Au+Au 0~10%
QM09, M. Ploskon
2009/Sep/15, flow workshop, ECT* Trento
ShinIchi Esumi, Univ. of Tsukuba
23
J-cal for LHC-ALICE experiment
for back-to-back jets measurements
2009/Sep/15, flow workshop, ECT* Trento
ShinIchi Esumi, Univ. of Tsukuba
24
Summary
1) Gamma / Jet / hadron triggered correlation analysis
as a function of centrality and R.P.dependences
gives us the QGP tomography.
2) Mach-cone and Ridge like shape w.r.t.
a) geometrical suppression from energy loss,
b) re-distribution of the lost energy,
c) connection with flow/expansion dynamics
d) transverse, longitudinal and radial(surface) direction
3) Low pT v2 can be biased by the triggered jet.
associated particle v2hard > inclusive v2all >~ thermal v2soft
4) Global understanding of RAA, v2 from low pT (flow)
to high pT (suppression), especially soft-hard interplay
at middle pT region (jet without any flow subtraction?).
2009/Sep/15, flow workshop, ECT* Trento
ShinIchi Esumi, Univ. of Tsukuba
25
200GeV Au+Au -> h-h (run7)(pTTrig=2~4GeV/c, pTAsso=1~2GeV/c)
mid-central : 20-50%
(5)
(4)
(6)
(3)
(7)
(2)
(8)
(1)
peripheral : 50-93%
average
out-of-plane
in-plane
central : 0-20%
PHENIX preliminary
2009/Sep/15, flow workshop, ECT* Trento
Asso.  Trig. (rad)
ShinIchi Esumi, Univ. of Tsukuba
26
Results on fitting parameters
FNear
FAway+ Faway
Asso.  Trig. (rad)
A0
Gauss function : F(height, mean, width)
FNear(A0, D0, S0) + FAway+(A+ , D+ , S+) + FAway(A , D , S)
| p  D+ | = | D  p | ,
S+= S
(1)
(8)
(2)
(7)
(3)
near side peak position
left/right asymmetry
S0
(6)
(4)
(5)
(5)
(4)
(6)
(3)
(7)
(2)
(8)
0 ~ 20 %
20 ~ 50 %
50 ~ 93 %
D0
0.5(A+ + A)
away side shoulder height
left/right asymmetry
0.5
PHENIX preliminary
2009/Sep/15, flow workshop, ECT* Trento
away side shoulder
peak position
(A+  A)
(A+ + A)
in-plane
(1)
Trig.R.P.
[p/p/]
S+/
| D+/  p |
Trig.  R.P. (rad)
ShinIchi Esumi, Univ. of Tsukuba
27
Simulation
v2,4Trig (soft) = 0.2, 0.029
v2,4Asso (soft) = 0.13, 0.010
v2,4Jet (hard) = 0.0, 0.0
v2,4PTY (hard) = 0.0, 0.0
nTrig / eve (soft) = 3
nAsso / eve (soft) = 8
nJet / eve (hard) = 1
nPTY / jet (hard) = 1.25
jet shape #1
jet shape #2
jet shape #3
v2(high)=0.20 ---> 0.15
v4(high)=0.029 ---> 0.022
v2(low)=0.13 ---> 0.14
v4(low)=0.010 ---> 0.015
v2(high)=0.20 ---> 0.15
v4(high)=0.029 ---> 0.022
v2(low)=0.13 ---> 0.13
v4(low)=0.010 ---> 0.014
v2(high)=0.20 ---> 0.15
v4(high)=0.029 ---> 0.022
v2(low)=0.13 ---> 0.12
v4(low)=0.010 ---> 0.011
jet shape #4
v2(high)=0.20 ---> 0.15
v4(high)=0.029 ---> 0.022
v2(low)=0.13 ---> 0.11
v4(low)=0.010 ---> 0.009
ASSO  TRIG (rad)
2009/Sep/15, flow workshop, ECT* Trento
ShinIchi Esumi, Univ. of Tsukuba
28
AMPT (v1.11, parton cascade with string melting v2.11) Au+Au at sqrt(sNN)=200GeV
peripheral
0~4%
b = 0~3.5 (fm)
in-plane
Trig.  R.P. > 0 (open symbols)
Trig.  R.P. < 0 (filled symbols)
4~18%
b = 3.5~7 (fm)
perfect R.P. resolution
no v2 subtraction needed
2009/Sep/15, flow workshop, ECT* Trento
average out-of-plane
(true) reaction plane aligned correlation function
central
AMPT
18~44%
b = 7~10.5 (fm)
44~%
b = 10.5~ (fm)
Asso.  Trig. (rad) with trigger angle selected w.r.t. R.P.
(pTAsso. : 0.5~1.5GeV/c
pTTrig. : 1.5~5.0GeV/c)
ShinIchi Esumi, Univ. of Tsukuba
29
AMPT(v1.25/v2.25 string melting) : Au+Au 200GeV b=7fm (with embedding option)
no embedding
7GeV
in-plane
7GeV
out-of-plane
7GeV
at +45 deg
Z.W.Lin, J.Jia,
S. Mohapatra,
S. Esumi
7GeV
at 45 deg
mixed events with the same triggered (embedded) events
2009/Sep/15, flow workshop, ECT* Trento
ShinIchi Esumi, Univ. of Tsukuba
30
mixed events with the same triggered (embedded) events
no embedding
7GeV
in-plane
7GeV
out-of-plane
7GeV
at +45 deg
7GeV
at 45 deg
mixed events without the triggered (embedded) events
--- mixed events from min.bias events ---
2009/Sep/15, flow workshop, ECT* Trento
ShinIchi Esumi, Univ. of Tsukuba
31
Direct  - hadron coincidence
QM09, M. Connors
Head region
2009/Sep/15, flow workshop, ECT* Trento
ShinIchi Esumi, Univ. of Tsukuba
32
Jet - hadron correlation
RHIC-AGS’09, J. Putschke
High Tower Trigger (HT) : (x)=(0.05x0.05) ET>5.4GeV
2009/Sep/15, flow workshop, ECT* Trento
ShinIchi Esumi, Univ. of Tsukuba
33
Pythia (p+p) jet
Pyquen jet
(quenched)
1/NTRIG dNASSO/d
ETTRIG > 80GeV
ETASSO = 20~40GeV
ETTRIG > 80GeV
ETASSO = 40~80GeV
Di-jet simulation
at 5.5TeV
between
pythia (p+p)
and
pyquen
(quench model)
out-ward trigger
in-ward trigger
out-ward
in-ward
ETTRIG > 80GeV
ETASSO > 80GeV
D. Sakata,
Grad. Student of Tsukuba
 = JetAsso - JetTrig (rad)
2009/Sep/15, flow workshop, ECT* Trento
ShinIchi Esumi, Univ. of Tsukuba
34
 in
PHOS/J-cal
p0 in
PHOS/J-cal
Recoil Di-jet ETjet1>70GeV
EM-cal
EM-cal
Recoil -jet ET>30GeV
Recoil p0-jet ETp0>30GeV
jet (R<0.3)
in J-cal
M. Sano,
H. Yokoyama,
Grad. Student of Tsukuba
EM-cal
2009/Sep/15, flow workshop, ECT* Trento
ShinIchi Esumi, Univ. of Tsukuba
35
Improvement in jet energy resolution
2009/Sep/15, flow workshop, ECT* Trento
ShinIchi Esumi, Univ. of Tsukuba
36