heavy-ion cafe, 30/jun/2007, tokyoshinichi esumi, inst. of physics, univ. of tsukuba1 jet...

Heavy-Ion Cafe, 30/Jun/2007, Tokyo ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba 1

Jet correlation and modification at RHIC--- 2 and 3 particle correlation ---

ShinIchi EsumiInst. of Physics, Univ. of Tsukuba


x

z

Non-central Collisions

Elliptic and DirectedFlow

jet suppression/geometry

jet

p p

Au Au

jet suppressionand modification

Angular dependence of jet suppression

and modification


ST

AR

: PR

L 97, 152301 (2006)

STAR preliminary

phenix: nucl-ex/0703024

RA

A


PHENIX preliminary

annihilationcompton scattering

Bremsstrahlung (energy loss)prompt photon v2 = 0

v2 < 0thermal photon v2 > 0

Jet-frag. photon from the survived partonv2 > 0

direct photon as a probe of bulk matter QM06


Inclusive -h

Decay -h contribution(via 0-hadron)

Direct -h !

p+p collisions at 200 GeV

PHENIX Preliminary PHENIX Preliminary

Reasonable agreement

between data and Pythia

Pythia 6.1, kT = 2.5 GeV

Black: Au+Au Red: p+p


pedestal and flow subtracted

4 < pT,trig< 6 GeV/c, 2< pT,assoc< pT,trig

0-5%

STAR, PRL 90 (2003) 082302


STAR, Phys. Rev. Lett. 97 (2006) 162301

8 < pT,trig< 15 GeV/c


PHENIX preliminary

Phys. Rev. Lett. 97, 052301 (2006)

Leadinghadrons

Medium


Fit away-side peak with double Gaussian, each centered at = ± D

PHENIX nucl-ex/0611019


Au+Au / p+p s = 200 GeV

arXiv:0705.3238 [nucl-ex]

Per-trigger yield vs. for various trigger and partner pT (pA

T pBT)

Establish the punch-through jet component (“Head Region”)

and the medium-induced component (“Shoulder Region”)

HR+SR (||<=/2) and HR (|-|<=/6).


Au+Au / p+p s = 200 GeV

arXiv:0705.3238 [nucl-ex]


Shoulder

jet

Head

jetHS YdYdR )()(


PHENIX Preliminary

centralperipheral


|ηtrig|<13<pT

trig<10 GeV/c

2.7<|ηassoc|<3.90.2<pT

assoc< 2 GeV/c


Trigger: MTPC: 3<pTtrig<4 GeV/c,

Associated: FTPC: 0.2<pTassoc< 2 GeV/c, MTPC: 0.2<pT

assoc< 3 GeV/c

pp MBdAu MB

AuAu 60-80%AuAu 0-10%AuAu 0-5%


d+Au, 40-100% Au+Au, 0-5%

3 < pT(trig) < 6 GeV2 < pT(assoc) < pT(trig)

Study near-side yields

Study away-side correlated yields and shapes

Components near-side jet peak

near-side ridge

v2 modulated background

Au+Au 0-10%

preliminary


Jet + Ridge Jet

nucl-ex/0611016(PHENIX)

Jet + Ridge


Jet spectra

Yie

ld (

pt,

as

so

c >

pt,

as

so

c,c

ut)

Ridge spectra

Yie

ld (

pt,

as

so

c >

pt,

as

so

c,c

ut)

pt,assoc,cut pt,assoc,cut

inclusive

inclusive

STAR preliminarySTAR preliminary


zT = pT,assoc/pT,trig

zT = pT,assoc/pT,trig

STAR preliminary

STAR preliminary

Jet+Ridge in Au+Au Jet in d+Au

“Jet” in Au+Au

STAR, M. Horner, QM06

Jet in d+Au

Jet+Ridge

“Jet”


1

3

12

0

13

12

0

Event by event deflection of jets

Cone like structure in each event


Δ12

Δ

3(12 ,13) / Trigger

2-Part Correlation

Flow background

Jetty signalJetBackground Hard-Soft Term

Trigger 2-Background Soft-Soft term

Trigger Background Flow Term

v2(1) v2(2) v22

v4(1)v4(2) + v2(1)v2(2)v2(3) v2

4

v4=1.15v22


(12-13)/2

(12+13)/2

12

1

3

Deflected Jet + Cone

Cone

Near Side

Elongated Away Side Jet


Jet - Flow Subtraction - System Size Dependence

(12+13)/2

(12-13)/2

Δ12 Δ12 Δ12

Δ

Δ

Δ

pp d+AuAu+Au 50-80%


Jet - Flow Subtraction - System Size Dependence

Δ

Δ

Δ

Δ12Δ12

Δ12

(12+13)/2

(12-13)/2

Au+Au 30-50% Au+Au 10-30% Au+Au 0-10%

27

along azimuth

Polar plot

3 Particle Correlations in High pT Framework (*)

Normal Jet

Same Side

Away Side

*

*

Assoc. pTs (2,3)*

12

* =

along radius

*12

*13

* _=

Hi pT(1)

28

Deflected jet sim

Data shows strong away side modification

Mach Cone sim

High pT(1) High pT(1)

Normal jet sim

Same Side

Away Side

*

*

High pT(1)

3Particle Correlations in High pT Framework

29

Simulated Deflected jet

Simulated Mach Cone

The data validates the presence of a Mach Cone but does not rule out The data validates the presence of a Mach Cone but does not rule out contributions from other topologies.contributions from other topologies.

Azimuthal variation along ridge

Data


Results: flow contribution and conditional yieldR

aw C

orre

lati

onC

ondi

tion

al y

ield

CERN-SPS, CERES/NA45

flow contribution(stat. unceratinties in v2)

Hard probes ref

Trigger pt : (2.5-4.0) GeV/c Associate pt : (1.0-2.5) GeV/c


0-5% 10-20%

√s=62.4 GeVat RHIC

nucl-ex/0611019

2.5 < pT,trig

< 4.0 GeV/c

1.0 < pT,assoc < 2.5 GeV/c

√s=19 GeV at SPS

nucl-ex/0611019√s=200 GeVat RHIC


3 Particle correlations : two particle contributions

- (..+..+.. ) =

yieldraw correlations


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?!?


Is there a ridge on the away-side (di-hadron trigger) ?

T1 near-side trigger > 6 (8) GeV

T2 “away-side trigger” > 4 (6) GeV(and < near-side trigger)within 180 deg. +- 30 deg.

A assoc. particles > 2 GeV

disappearing bkg.

8<pt,trigger<15 GeV

Use “away-side trigger” for 2-particle correlations


projection

Di-jets in Au+Au

projection

T1A & T2

T2A

T1A & T2

T2A

STAR preliminary STAR preliminary

T1: pT>5GeV/c

T2: pT>4GeV/c

A : pT>1.5GeV/c

STAR, R. Hollis, Berkeley School (07)


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


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.|


AMPT 200GeV Au+Audefault option (solid symbols)

melting-on (open symbols)

central peripheral

total multiplicity

peripheral central

default

melting-on

pT (GeV/c)

char

ged

par

ticl

e v2

(|

|<1)

char

ged

par

ticl

e v2

(|

|<1)

black symbols :

true v2 w.r.t. true r.p.

red symbols :

measured v2 w.r.t.

calculated r.p. at |h|=1.7~4

blue symbols :

corrected v2 with

estimated r.p. resolution

r.p

. res

olu

tion sub-event correlation

<cos2(A-B)>

true resolution

<cos2(meas.-true)>

estimated r.p. resolution

melting-on

default


(1)

(2)

(3)

(4)

(2)

(3)

(4)

(1)

Trigger

particle

x(R.P.) x(R.P.)

yy

(2)Trigger

particle

ASSO.TRIG.

R.P. : rxn S+N

pTTRIG. : 1.5-4.0 GeV/c

pTASSO. : 0.5-1.5 GeV/c

associate particle direction at

same || w.r.t. trigger particle

but with different arrow length

associate particle direction at

same || w.r.t. red dashed line

but with different arrow length


AMPT 200GeV Au+Audefault option melting-on

0~9%

9~19%

19~39%

39~100%

(1) (2) (3) (4) (all)(1) (2) (3) (4) (all)

0~9%

9~19%

19~39%

39~100%


SMD/ZDC

BBC/MPC

participant elliptic R.P.

spectator directed R.P.

MVD/RXN

PHENIX improved R.P. resolution


RXN(S) - RXN(N)MPC(S) - MPC(N)BBC(S) - BBC(N)

RXN(SN) - MPC(SN)RXN(SN) - BBC(SN)

BBC+MPC+RXN (S - N)BBC+MPC (S - N)

(2000 - BBC charged multiplicity)/100 : [centrality bin]

<co

s 2(

A-

B)>

v2 and v4 resolution<

cos

4(

A-

B)>


Summary

jet quenching, v2

jet suppression and re-appearancejet modification at low-mid pThead-shoulder regionnear-side ridgecone / deflection

system size, centrality dependencerapidity, energy dependenceh-h, -h correlation2 and 3 particles2+1 correlationr.p. angle dependence

heavy-ion cafe, 30/jun/2007, tokyoshinichi esumi, inst. of physics, univ. of tsukuba1 jet...

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