Two particle correlation measurements
description
Transcript of Two particle correlation measurements
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
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(4) s=[-1,0]/8(5) s=[0,1]/8
PHENIX preliminary
in-planetrigger selection
out-of-planetrigger selection
average
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(2)
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(7)(8)(1)
(2)
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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
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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
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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)
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(3)
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(7)(8)(1)
(2)
(3)
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(7)(8)
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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
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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
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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
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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
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0
z
x
y
left-right asymmetryforward-backward asymmetry
Takahito Todoroki : session BB
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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
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J-cal for LHC-ALICE experimentfor back-to-back jets measurements