1. ShinIchi Esumi, Univ. of Tsukuba
Hard - Soft Interplay at RHIC relation between v2 and jet-modification ShinIchi Esumi Univ. of Tsukuba
to replace the following talk
--- Bridging the soft and the hard at RHIC Jiangyong Jia
15/Oct/2009, DNP/JPS, Hawaii
ShinIchi Esumi, Univ. of Tsukuba

2. ShinIchi Esumi, Univ. of Tsukuba
Two particle  correlation measurements
away side suppression
at relatively high pT
away side modification
at relatively low-middle pT
15/Oct/2009, DNP/JPS, Hawaii
ShinIchi Esumi, Univ. of Tsukuba

3. ShinIchi Esumi, Univ. of Tsukuba
Single particle RAA and v2 measurements
various things are changing
at low-middle pT region.
15/Oct/2009, DNP/JPS, Hawaii
ShinIchi Esumi, Univ. of Tsukuba

4. ShinIchi Esumi, Univ. of Tsukuba
(1) geometrical (almond shaped) effect or
(2) dynamical (elliptic expansion) effect
(trigger direction)
near side
away side
(head region)
mach-cone
(shoulder region)
ASSO-TRIG>0
ASSO-TRIG<0
thin side
thick side
ASSO  TRIG
-p 0 p
15/Oct/2009, DNP/JPS, Hawaii
ShinIchi Esumi, Univ. of Tsukuba

5. ShinIchi Esumi, Univ. of Tsukuba
200GeV Au+Au -> h-h (run7)
(pTTrig=2~4GeV/c, pTAsso=1~2GeV/c)
mid-central : 20-50%
(4) s=[-1,0]/8
(5) s=[0,1]/8
in-plane
trigger selection
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
in-plane
(3) s=[-2,-1]/8
(6) s=[1,2]/8
in-plane
associate
regions
c2(data) - c2(flow)
(2) s=[-3,-2]/8
(7) s=[2,3]/8
strong preference of associate particle emission towards the in-plane direction
s = Trig. R.P.
[]
(1) s=[-4,-3]/8
(8) s=[3,4]/8
out-of-plane
trigger selection
average
PHENIX preliminary
significant
not significant compared
with systematic errors
Asso. Trig. (rad)
15/Oct/2009, DNP/JPS, Hawaii
ShinIchi Esumi, Univ. of Tsukuba

6. ShinIchi Esumi, Univ. of Tsukuba
QM09 STAR
200GeV Au+Au 20-60% (pTTrig=3~4GeV/c, pTAsso=1~1.5GeV/c, >0.7, Trig-R.P.<0)
in-plane
trigger selection
out-of-plane
trigger selection
strong preference of associate particle emission towards the in-plane direction
QM08 STAR
STAR Preliminary
3<pTtrig<4, 1.5<pTtrig<2.0 GeV/c
Ridge
Jet
15/Oct/2009, DNP/JPS, Hawaii
ShinIchi Esumi, Univ. of Tsukuba

7. ShinIchi Esumi, Univ. of Tsukuba
Toy model simulation with flow
+ jet (strong R.P. dependence)
random mixing
with min. bias flow
random mixing
with zero bias flow
NAsso (1~2 GeV/c) :
soft : 8
hard : 1 x fJet x 1.25[1/trig]
NTrig (2~4 GeV/c) :
soft : 1 x (1-fJet)
hard : 1 x fJet
fJet : 0.25
v2Trig : 19.6%
v2Asso : 13.1% (flow)
: 13.6% (m.b.)
: 14.9% (bias)
: 25.5% (jet)
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
15/Oct/2009, DNP/JPS, Hawaii
ShinIchi Esumi, Univ. of Tsukuba

8. ShinIchi Esumi, Univ. of Tsukuba
Toy model simulation
v2Asso : 13.1% (flow)
: 13.6% (m.b.)
: 14.9% (bias)
: 25.5% (jet)
random mixing
with min. bias
flow subtraction
random mixing
with zero bias
flow subtraction
qualitatively consistent with jet trigger biased v2 measurements
15/Oct/2009, DNP/JPS, Hawaii
ShinIchi Esumi, Univ. of Tsukuba

9. ShinIchi Esumi, Univ. of Tsukuba
Z.W.Lin, J.Jia,
S. Mohapatra,
S. Esumi
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
7GeV
at 45 deg
mixed events with the same triggered (embedded) events
no embedding
7GeV
in-plane
out-of-plane
at 45 deg
at 45 deg
15/Oct/2009, DNP/JPS, Hawaii
ShinIchi Esumi, Univ. of Tsukuba

10. ShinIchi Esumi, Univ. of Tsukuba
Z.W.Lin, J.Jia,
S. Mohapatra,
S. Esumi
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
7GeV
at 45 deg
mixed events without the triggered (embedded) events
--- mixed events from min.bias events ---
no embedding
7GeV
in-plane
out-of-plane
at 45 deg
at 45 deg
15/Oct/2009, DNP/JPS, Hawaii
ShinIchi Esumi, Univ. of Tsukuba

11. ShinIchi Esumi, Univ. of Tsukuba
Summary and Outlook (in back-ups)
(1) re-distribution of lost energy from jet quenching at low-middle pT
(2) strong R.P. dependence of the Mach-cone/ridge shape
strong preference of associate particle emission towards the in-plane
(3) trigger particle bias in soft particle v2 can be understood qualitatively
what would be the true v2 to be compared with hydro-model?
(4) hard/soft coupling with transverse/longitudinal geometry/dynamics
(5) controlled direction/depth bias with reconstructed jets
15/Oct/2009, DNP/JPS, Hawaii
ShinIchi Esumi, Univ. of Tsukuba

12. ShinIchi Esumi, Univ. of Tsukuba
forward-backward asymmetry
left-right asymmetry y  x z
Takahito Todoroki : session BB
15/Oct/2009, DNP/JPS, Hawaii
ShinIchi Esumi, Univ. of Tsukuba

13. ShinIchi Esumi, Univ. of Tsukuba
,Jet,0 - hadron
correlation
Comparisons are
the most important!
RHIC-AGS’09, Y. S. Lai
Closer and closer to
the initial parton energy
Gamma trigger
Jet (large R) trigger
STAR Preliminary
Jet (small R) trigger
0(hadron) trigger
more and more surface bias
given by energy loss
Au+Au 0~10%
QM09, M. Ploskon
15/Oct/2009, DNP/JPS, Hawaii
ShinIchi Esumi, Univ. of Tsukuba

14. J-cal for LHC-ALICE experiment
for back-to-back jets measurements
15/Oct/2009, DNP/JPS, Hawaii
ShinIchi Esumi, Univ. of Tsukuba