Hard - Soft Interplay at RHIC
relation between v2 and jet-modification
ShinIchi Esumi
Univ. 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

1

Two particle Δφ correlation measurements
away side suppression
at relatively high pT

15/Oct/2009, DNP/JPS, Hawaii

away side modification
at relatively low-middle pT

ShinIchi Esumi, Univ. of Tsukuba

2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 Tsukuba3

(1) geometrical (almond shaped) effector(2) dynamical (elliptic expansion) effectid e ir esar r dn e ig g e(trthin sidem a c h -c one( s h o u lde r r e g ion)
φASS -φO TRIG >0id e io n )sa y re gwa ad(h en)

φASSO-φTRIG<0mach-cone(shoulder region)
φASSO-φTRIG<0thick side

15/Oct/2009, DNP/JPS, Hawaiioc ti−π0φASSO − φTRIG

ShinIchi Esumi, Univ. of Tsukuba

π4

200GeV Au+Au -> h-h (run7)
in-planetrigger selection(4) φs=[-1,0]π/8(5) φs=[0,1]π/8(pTTrig=2~4GeV/c, pTAsso=1~2GeV/c)

mid-central : 20-50%c2(data) - c2(flow)(1)

out-of-plane
trigger selection(3) φs=[-2,-1]π/8(6) φs=[1,2]π/8(2)in-plane
associate
regions

(7)

(3)

(6)

(4)

(5)

(5)

(4)

(6)

(3)

(2) φs=[-3,-2]π/8(7) φs=[2,3]π/8(1) φs=[-4,-3]π/8(8) φs=[3,4]π/8(8)(7)

in-plane(2)(8)

strong preference ofassociate particle
emission towards thein-plane direction(1)

φs = φTrig. − ΦR.P.
[−π/2,π/2]

average

PHENIX preliminary

significant

Δφ = φAsso. − φTrig. (rad)15/Oct/2009, DNP/JPS, Hawaii

not significant comparedwith systematic errors

ShinIchi Esumi, Univ. of Tsukuba

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QM09 STAR

200GeV Au+Au 20-60% (pTTrig=3~4GeV/c, pTAsso=1~1.5GeV/c, |Δη|>0.7, φTrig-ΦR.P.<0)in-plane
trigger selection

out-of-plane
trigger selection

strong preference of associate particle
emission towards the in-plane direction
QM08 STAR3<pTtrig<4, 1.5<pTtrig<2.0 GeV/cRidge

STAR PreliminaryJet

15/Oct/2009, DNP/JPS, Hawaii

ShinIchi Esumi, Univ. of Tsukuba

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

random mixing
with min. bias flow

random mixing
with zero bias flow

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) (1)

(8)

(2)

(7)
(6)

(3)
(4)

(5)

(5)

(4)

(6)

(3)
(7)

(2)
(8)

(1)

15/Oct/2009, DNP/JPS, Hawaii

ShinIchi Esumi, Univ. of Tsukuba

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v2Asso : 13.1% (flow): 13.6% (m.b.): 14.9% (bias): 25.5% (jet)Toy model simulation
random mixing
with min. bias
flow subtraction

random mixing
with zero bias
flow subtraction

qualitatively consistent with jet trigger biased v2 measurements
15/Oct/2009, DNP/JPS, Hawaii

ShinIchi Esumi, Univ. of Tsukuba

8

AMPT(v1.25/v2.25 string melting) : Au+Au 200GeV b=7fm (with embedding option)
no embedding

7GeV
in-planeno embedding

7GeV
in-plane

7GeV
out-of-plane

7GeV
out-of-plane

7GeV
at +45 deg

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

7GeV
at −45 deg

7GeV
at +45 deg

7GeV
at −45 deg

mixed events with the same triggered (embedded) events
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

7GeV
in-planeno embedding

7GeV
in-plane

7GeV
out-of-plane

7GeV
out-of-plane

7GeV
at +45 deg

7GeV
at +45 deg

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

7GeV
at −45 deg

7GeV
at −45 deg

mixed events without the triggered (embedded) events--- mixed events from min.bias events --15/Oct/2009, DNP/JPS, Hawaii

ShinIchi Esumi, Univ. of Tsukuba

10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 shapestrong 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

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forward-backward asymmetry0η

left-right asymmetry
yxz

Takahito Todoroki : session BB15/Oct/2009, DNP/JPS, Hawaii

ShinIchi Esumi, Univ. of Tsukuba

12γ,Jet,π0 - hadroncorrelation

RHIC-AGS’09, Y. S. Lai

Comparisons are
the most important!

to yr
es nergolec
nd rtonar
ser ial paolge
C initgitrathemmaerGggi) tr
Rrgeal(Jeterggtri)ll Ra(smteJergig) trndroaiasb0 (hπacefr
su serolosmydgan enerer
mo en bygiv

15/Oct/2009, DNP/JPS, Hawaii

STAR Preliminary

Au+Au 0~10%

QM09, M. Ploskon

ShinIchi Esumi, Univ. of Tsukuba

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

15/Oct/2009, DNP/JPS, Hawaii

ShinIchi Esumi, Univ. of Tsukuba

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