15/Oct/2009, DNP/JPS, Hawaii ShinIchi Esumi, Univ. of Tsukuba 1

Hard - Soft Interplay at RHIC relation between v2 and jet-modification

ShinIchi EsumiUniv. 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

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

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

ASSO TRIG

near side

(trigger d

irectio

n)

away side

(head region)

mach-cone (shoulder region)ASSO-TRIG>0

mach-cone (shoulder region)ASSO-TRIG<0

ASSO-TRIG<0

thin side

thick side

(1) geometrical (almond shaped) effect or (2) dynamical (elliptic expansion) effect

15/Oct/2009, DNP/JPS, Hawaii ShinIchi Esumi, Univ. of Tsukuba 5

(4) s=[-1,0]/8(5) s=[0,1]/8

PHENIX preliminary

in-planetrigger selection

out-of-planetrigger selection

average

(1)

(2)

(3)

(4)

(5)

(6)

(7)(8)(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

in-plane

Asso. Trig. (rad)

in-plane associate regions

s = Trig. R.P.

[]

(6) s=[1,2]/8

(7) s=[2,3]/8

(8) s=[3,4]/8

(3) s=[-2,-1]/8

(2) s=[-3,-2]/8

(1) s=[-4,-3]/8

200GeV Au+Au -> h-h (run7)(pT

Trig=2~4GeV/c, pTAsso=1~2GeV/c)

mid-central : 20-50%c 2

(dat

a) -

c2(

flow

)

significant

not significant comparedwith systematic errors

strong preference of associate particle emission towards the in-plane direction

15/Oct/2009, DNP/JPS, Hawaii ShinIchi Esumi, Univ. of Tsukuba 6

STAR Preliminary Rid

ge

Jet

3<pTtrig<4, 1.5<pT

trig<2.0 GeV/c

QM08 STAR

QM09 STAR 200GeV Au+Au 20-60% (pTTrig=3~4GeV/c, pT

Asso=1~1.5GeV/c, >0.7, Trig-R.P.<0)

strong preference of associate particle emission towards the in-plane direction

in-planetrigger selection

out-of-planetrigger selection

15/Oct/2009, DNP/JPS, Hawaii ShinIchi Esumi, Univ. of Tsukuba 7

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)

random mixing with min. bias flow

random mixing with zero bias flow

Toy model simulation with flow + jet (strong R.P. dependence)

(1)(2)

(3)

(4)

(5)

(6)

(7)(8)(1)

(2)

(3)

(4)

(5)

(6)

(7)(8)

15/Oct/2009, DNP/JPS, Hawaii ShinIchi Esumi, Univ. of Tsukuba 8

random mixing with min. bias flow subtraction

random mixing with zero bias flow subtraction

v2Asso : 13.1% (flow)

: 13.6% (m.b.) : 14.9% (bias) : 25.5% (jet)

qualitatively consistent with jet trigger biased v2 measurements

Toy model simulation

15/Oct/2009, DNP/JPS, Hawaii ShinIchi Esumi, Univ. of Tsukuba 9

AMPT(v1.25/v2.25 string melting) : Au+Au 200GeV b=7fm (with embedding option)

no embedding 7GeVin-plane

7GeVout-of-plane

7GeVat 45 deg

7GeVat 45 deg

Z.W.Lin, J.Jia,S. Mohapatra,S. Esumi

mixed events with the same triggered (embedded) events

no embedding 7GeVin-plane

7GeVout-of-plane

7GeVat 45 deg

7GeVat 45 deg

15/Oct/2009, DNP/JPS, Hawaii ShinIchi Esumi, Univ. of Tsukuba 10

AMPT(v1.25/v2.25 string melting) : Au+Au 200GeV b=7fm (with embedding option)

no embedding 7GeVin-plane

7GeVout-of-plane

7GeVat 45 deg

7GeVat 45 deg

Z.W.Lin, J.Jia,S. Mohapatra,S. Esumi

mixed events without the triggered (embedded) events--- mixed events from min.bias events ---

no embedding 7GeVin-plane

7GeVout-of-plane

7GeVat 45 deg

7GeVat 45 deg

15/Oct/2009, DNP/JPS, Hawaii ShinIchi Esumi, Univ. of Tsukuba 11

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

0

z

x

y

left-right asymmetryforward-backward asymmetry

Takahito Todoroki : session BB

15/Oct/2009, DNP/JPS, Hawaii ShinIchi Esumi, Univ. of Tsukuba 13

0 (hadron) triggerJet (s

mall R) tr

iggerJet (large R) tr

iggerGamma trigger

Closer and closer to

the initial parton energy

more and more surface bias

given by energy loss

STAR Preliminary

Au+Au 0~10%

,Jet,0 - hadron correlation Comparisons are the most important!

RHIC-AGS’09, Y. S. Lai

QM09, M. Ploskon

15/Oct/2009, DNP/JPS, Hawaii ShinIchi Esumi, Univ. of Tsukuba 14

J-cal for LHC-ALICE experimentfor back-to-back jets measurements