1. 「ジェットのv2」 と 「ジェット分布の変化」 は区別できるのか?
マッハ錐についてのコメント
「ジェットのv2」　と　「ジェット分布の変化」　は区別できるのか?
筑波大、物理、江角晋一

2. jet p Au
Leading
hadrons
Medium
jet p

3. jet modification and cone like structure
STAR
preliminary
0-5% Pb +Au 17GeV pTtrig=2.5-4 GeV/c pTassoc=1-2.5 GeV/c
PHENIX
nucl-ex/
0-12% 200 GeV Au+Au
CERES preliminary
PHENIX Preliminary
10-20% Au+Au 200GeV
pTtrig=2.5-4 GeV/c
pTassoc=1-2.5 GeV/c
STAR preliminary
0-12% Au+Au 200GeV
pTtrig=3-4 GeV/c
pTassoc=1-2 GeV/c
CERES preliminary 0-5% Pb +Au 17GeV pTtrig=2.5-4 GeV/c pTassoc=1-2.5 GeV/c
The bulk and jet interaction is there, but in Cu+Cu/Au+Au and SPS-RHIC?!?

4. PRL
nucl-ex/

5. jet modification and its correlation with v2
STAR, PRL93 (2004)
PHENIX, nucl-ex/
|ftrig-fRP|
jet shape w.r.t. reaction plane
geometrical effect of the almond shape
This effect itself is a one of v2 sources,
which will be an important effect at LHC.
This should also lead different v2 between bulk and jet.

7. 筑波大4年　齊藤飛鳥　卒業研究

8. C2 (dNpair/d|ftrig.-fasso.|)
C1 (dNsingle/d|f|)
C2 (dNpair/d|ftrig.-fasso.|)
1.6
1.0
0.4
1.6
1.0
0.4
1.3
1.0
0.7
1.3
1.0
0.7
1.3
1.0
0.7
all pairs
in-plane
trigger
out-of-plane
trigger
v2asso.
v2trig.
pTasso.
GeV/c
pTtrig.
1.7-4GeV/c
|fasso.- FR.P.|
|ftrig.- FR.P.|
|fasso.- ftrig..|
1/Ntrig. dNasso./d|ftrig.-fasso.|
|fasso.- ftrig..|

9. 1/Ntrig. dNasso./d|ftrig.-fasso.|
pTasso. : GeV/c
pTtrig. : 1.7-4GeV/c
AMPT 200GeV Au+Au → charged hadrons (|y|<2.0)
string-melting 10mb
string-melting 3mb
default AMPT 3mb
b = 12 fm ~
b = 8~12 fm
b = 4~8 fm
b = 0~4 fm
1/Ntrig. dNasso./d|ftrig.-fasso.|
|ftrig.-fasso.| (rad)
筑波大4年　塩原尚希　卒業研究

10. 1/Ntrig. dNasso./d|ftrig.-fasso.|
pTasso. : GeV/c
pTtrig. : 1.7-4GeV/c
AMPT 200GeV Au+Au → charged hadrons (|y|<2.0)
trigger at in-plane
average
trigger at out-of-plane
b = 12 fm ~
b = 8~12 fm
b = 4~8 fm
b = 0~4 fm
1/Ntrig. dNasso./d|ftrig.-fasso.|
|ftrig.-fasso.| (rad)

11. 答え：区別できない。 v2thermal = v2jet dNsingle/d|f| dNpair/d|Df|
inclusive
average inclusive v2
(v2thermal + v2jet)
v2asso.*v2trig.
dNpair/d|Df|
jet
v2thermal = v2jet
all pairs
Jet-matter interaction should modify the jet shape depending on the orientation with respect to the ellipse axis.
The suppression caused by the interaction gives high pT v2,
while the modification would change the low-mid pT v2.

12. Back-ups

13. nucl-ex/
PRL

14. 1/Ntrig. dNasso./d|ftrig.-fasso.|
AMPT 200GeV Au+Au (b=0-4fm) → charged hadrons (|y|<2.0)
pTasso. : GeV/c
pTtrig. : 1.5-4GeV/c
pTasso. : GeV/c
pTtrig. : 1.7-4GeV/c
1/Ntrig. dNasso./d|ftrig.-fasso.|
pTasso. : 1-2GeV/c
pTtrig. : 2-4GeV/c
pTasso. : 1-2.5GeV/c
pTtrig. : 2.5-4GeV/c
|ftrig.-fasso.| (rad)

15. C2 (dNpair/d|ftrig.-fasso.|) - flow(v2 trig.*v2 asso.)
AMPT 200GeV Au+Au (b=0-4fm) → charged hadrons (|y|<2.0)
pTasso. : GeV/c
pTtrig. : 1.5-4GeV/c
pTasso. : GeV/c
pTtrig. : 1.7-4GeV/c
C2 (dNpair/d|ftrig.-fasso.|) - flow(v2 trig.*v2 asso.)
pTasso. : 1-2GeV/c
pTtrig. : 2-4GeV/c
pTasso. : 1-2.5GeV/c
pTtrig. : 2.5-4GeV/c
|ftrig.-fasso.| (rad)

16. 1/Ntrig. dNasso./d|ftrig.-fasso.|
pTasso. : GeV/c
pTtrig. : 1.7-4GeV/c
AMPT 200GeV Au+Au (b=0-4fm) → charged hadrons (|y|<2.0)
default AMPT 3mb
default AMPT 10mb
string-melting 3mb
string-melting 10mb
1/Ntrig. dNasso./d|ftrig.-fasso.|
|ftrig.-fasso.| (rad)

17. 1/Ntrig. dNasso./d|ftrig.-fasso.|
pTasso. : GeV/c
pTtrig. : 1.7-4GeV/c
AMPT 200GeV Au+Au → charged hadrons (|y|<2.0)
string-melting 3mb
string-melting 10mb
central (b=0-4fm)
peripheral (b=8-12fm)
1/Ntrig. dNasso./d|ftrig.-fasso.|
|ftrig.-fasso.| (rad)