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「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

jet

p p

Au Au

jet

p p

Leadinghadrons

Medium

STARpreliminary

0-12% 200 GeV Au+Au

PHENIX nucl-ex/0611019

PHENIX Preliminary10-20% Au+Au 200GeVpT

trig=2.5-4 GeV/c pT

assoc=1-2.5 GeV/c

STAR preliminary0-12% Au+Au 200GeVpT

trig=3-4 GeV/c pT

assoc=1-2 GeV/c

CERES preliminary

0-5% Pb +Au 17GeV pT

trig=2.5-4 GeV/c pT

assoc=1-2.5 GeV/c

CERES preliminary0-5% Pb +Au 17GeV pT

trig=2.5-4 GeV/c pT

assoc=1-2.5 GeV/c

jet modification and cone like structure

The bulk and jet interaction is there, but in Cu+Cu/Au+Au and SPS-RHIC?!?

nucl-ex/0611019PRL 97 052301

STAR, PRL93 (2004) 252301.

|trig-RP|

PHENIX, nucl-ex/0510019.

jet modification and its correlation with v2

jet shape w.r.t. reaction plane geometrical effect of the almond shapeThis 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.

筑波大 4年　齊藤飛鳥　卒業研究

|asso.- R.P.| |trig.- R.P.| |asso.- trig..|

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

C1 (dNsingle/d||) C2 (dNpair/d|trig.-asso.|)

v2asso. v2

trig.

pTasso.

0.7-1.7GeV/cpT

trig.

1.7-4GeV/c

in-plane trigger

out-of-plane trigger

all pairs

|asso.- trig..|

1/N

trig

. dN

asso

./d|

trig

.-as

so.|

AMPT 200GeV Au+Au → charged hadrons (|y|<2.0)

string-melting 10mbstring-melting 3mbdefault AMPT 3mb

b = 12 fm ~ b = 8~12 fm b = 4~8 fm b = 0~4 fm

1/N

trig

. dN

asso

./d|

trig

.-as

so.|

|trig.-asso.| (rad)

pTasso. : 0.7-1.7GeV/c

pTtrig. : 1.7-4GeV/c

筑波大 4年　塩原尚希　卒業研究

AMPT 200GeV Au+Au → charged hadrons (|y|<2.0)pT

asso. : 0.7-1.7GeV/cpT

trig. : 1.7-4GeV/c

trigger at in-planeaveragetrigger at out-of-plane

b = 12 fm ~ b = 8~12 fm b = 4~8 fm b = 0~4 fm

|trig.-asso.| (rad)

1/N

trig

. dN

asso

./d|

trig

.-as

so.|

v2thermal = v2

jet

average inclusive v2 (v2

thermal + v2jet)

v2asso.*v2

trig.

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.

dNpair/d||

答え：区別できない。

inclusive

dNsingle/d||

jet

Back-ups

nucl-ex/0611019

PRL 97 052301

1/N

trig

. dN

asso

./d|

trig

.-as

so.|

AMPT 200GeV Au+Au (b=0-4fm) → charged hadrons (|y|<2.0)

|trig.-asso.| (rad)

pTasso. : 0.5-1.5GeV/c

pTtrig. : 1.5-4GeV/c

pTasso. : 0.7-1.7GeV/c

pTtrig. : 1.7-4GeV/c

pTasso. : 1-2GeV/c

pTtrig. : 2-4GeV/c

pTasso. : 1-2.5GeV/c

pTtrig. : 2.5-4GeV/c

C2 (

dNpa

ir/d

|tr

ig.-

asso

.|) -

flo

w(v

2 trig

. *v 2 as

so. )

|trig.-asso.| (rad)

AMPT 200GeV Au+Au (b=0-4fm) → charged hadrons (|y|<2.0)

pTasso. : 0.5-1.5GeV/c

pTtrig. : 1.5-4GeV/c

pTasso. : 0.7-1.7GeV/c

pTtrig. : 1.7-4GeV/c

pTasso. : 1-2GeV/c

pTtrig. : 2-4GeV/c

pTasso. : 1-2.5GeV/c

pTtrig. : 2.5-4GeV/c

AMPT 200GeV Au+Au (b=0-4fm) → charged hadrons (|y|<2.0)1/

Ntr

ig.

dNas

so./d

|tr

ig.-

asso

.|

|trig.-asso.| (rad)

default AMPT 3mbdefault AMPT 10mb

string-melting 3mbstring-melting 10mb

pTasso. : 0.7-1.7GeV/c

pTtrig. : 1.7-4GeV/c

AMPT 200GeV Au+Au → charged hadrons (|y|<2.0)1/

Ntr

ig.

dNas

so./d

|tr

ig.-

asso

.|string-melting 3mbstring-melting 10mb

|trig.-asso.| (rad)

central (b=0-4fm) peripheral (b=8-12fm)

pTasso. : 0.7-1.7GeV/c

pTtrig. : 1.7-4GeV/c