1. Eitaro Hamada, Univ. of Tsukuba
Reaction plane dependence of multi particle azimuthal correlation in √sNN=200GeV Au+Au collisions at RHIC-PHENIX
(RHIC-PHENIX実験√sNN=200GeV金+金衝突における多粒子相関の反応平面依存の研究)
Eitaro Hamada, Univ. of Tsukuba
for the PHENIX collaboration
RHIC(200GeV)
AGS (4GeV)
BNL
PHENIX experiment
20/Mar/2010, JPS, Okayama, Japan
Eitaro Hamada, Univ. of Tsukuba

2. Eitaro Hamada, Univ. of Tsukuba
QGP x z
Hadron
20/Mar/2010, JPS, Okayama, Japan
Eitaro Hamada, Univ. of Tsukuba

3. Eitaro Hamada, Univ. of Tsukuba
Jet modification
--- at pT = 1~4 GeV/c ---
jet p Au
Back-to-back jet suppression
--- 2 particle  correlation ---
Leading
hadrons
Medium
jet p
20/Mar/2010, JPS, Okayama, Japan
Eitaro Hamada, Univ. of Tsukuba

4. Eitaro Hamada, Univ. of Tsukuba
h-h correlation at “p+p 200GeV” vs “Au+Au 200GeV central 0-20%”
associate pT window
Phys. Rev. C 78, (2008)
trigger pT window
20/Mar/2010, JPS, Okayama, Japan
Eitaro Hamada, Univ. of Tsukuba

5. Eitaro Hamada, Univ. of Tsukuba
Reaction plane dependent energy loss --- a dominant source of v2 at high pT ---
in-plane
out-of-plane
QM09, C. H. Chen
in-plane out-of-plane
near-side
in-plane out-of-plane
away-side
QM04: STAR
20/Mar/2010, JPS, Okayama, Japan
Eitaro Hamada, Univ. of Tsukuba

6. Eitaro Hamada, Univ. of Tsukuba
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
QM09, W. G. Holzmann
20/Mar/2010, JPS, Okayama, Japan
Eitaro Hamada, Univ. of Tsukuba

7. Eitaro Hamada, Univ. of Tsukuba
200GeV Au+Au -> h-h (run7)
(pTTrig=2~4GeV/c, pTAsso=1~2GeV/c)
mid-central : 20-50%
QM09: PHENIX
(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
c2(data) - c2(flow)
in-plane
associate
regions
(2) s=[-3,-2]/8
(7) s=[2,3]/8
s = Trig. R.P.
[]
strong preference of associate particle emission towards the in-plane direction
(1) s=[-4,-3]/8
(8) s=[3,4]/8
out-of-plane
trigger selection
average
PHENIX preliminary
Asso. Trig. (rad)
20/Mar/2010, JPS, Okayama, Japan
Eitaro Hamada, Univ. of Tsukuba

8. Eitaro Hamada, Univ. of Tsukuba
Summary and outlook
* Strong high pT jet suppression has been observed.
* Jet shape modification and enhancement from re-distribution of
the lost energy has been observed at relatively low pT correlation.
* Reaction plane dependence from high pT correlation analysis
shows path length dependence of suppression.
* Away side head region also shows the geometrical path length
effect in relatively low pT correlation analysis.
* Away side shoulder region shows some non trivial effect,
which also gives left/right asymmetry.
* Expected strong coupling with elliptic flow parameter: v2 .
2+1 correlation as well as multi-particle correlation in progress
particle identified correlation (baryon, meson, hadron, direct-…)
20/Mar/2010, JPS, Okayama, Japan
Eitaro Hamada, Univ. of Tsukuba

9. Eitaro Hamada, Univ. of Tsukuba
Dq*=p
Df*=0
PHENIX Preliminary
Cone like Jets
Deflected Jets
jet p Au
3-particle correlation “Df12 vs Df13”
d+Au
Collisions
Both measurements prefer
Mach-cone scenario.
(1-2)/2
Au+Au
Central 0-12%
Cone angle (radians)
No pT dependence, too.
STAR Preliminary
(1-2)/2
pT (GeV/c)
STAR Preliminary
20/Mar/2010, JPS, Okayama, Japan
Eitaro Hamada, Univ. of Tsukuba

10. Eitaro Hamada, Univ. of Tsukuba
Df = fassoftrig
Dh = hasso htrig
20/Mar/2010, JPS, Okayama, Japan
Eitaro Hamada, Univ. of Tsukuba

11. Eitaro Hamada, Univ. of Tsukuba
SQM09, F. Wang
20/Mar/2010, JPS, Okayama, Japan
Eitaro Hamada, Univ. of Tsukuba

12. Eitaro Hamada, Univ. of Tsukuba
Jet quenching
--- energy loss of parton in QGP ---
No energy loss for g‘s
Energy loss for quark and gluon jets (similar even for heavy quark)
RAA
20/Mar/2010, JPS, Okayama, Japan
Eitaro Hamada, Univ. of Tsukuba