Jet quenching and modification at RHIC
and jet calorimeter (J-cal) for LHC-ALICE
ShinIchi Esumi
Inst. of Physics, Univ. of Tsukuba

Gamma-Jet results
Jets, di-Jet results
Mach-cone, Ridge results
J-cal proposal/approval

Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

1

Hadron large suppression
Direct γ NO suppression

Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

2Direct γ - hadron coincidence

QM09, M. Connors

Head region
Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

3

IAA vs ZT

for direct γ-h compared with π0-hzT = pTh / pTγ

IAA€Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

4

QM09, A. Majumder

Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

5

Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

6

RHIC-AGS’09, Y. S. Lai

Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

7

Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

8

Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

9

Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

10

Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

11Inclusive Jet cross section in p+p
and in central Au+Au at RHIC

Heavy Ion Pub, 10/Jul/2009, Nagoya

QM09, M. Ploskon

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

12

Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

13

Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

14Anti-kt R=0.4

Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

15

QM09, E. Bruna

Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

16large uncertainties due to background(further systematic evaluation needed)20<pt,rec(AuAu)<25 GeV< pt,rec(pp)> ~ 18 GeVSTAR Preliminary

Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

17Jet - hadron correlation

RHIC-AGS’09, J. PutschkeHigh Tower Trigger (HT) : (ηxφ)=(0.05x0.05) ET>5.4GeV

Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

18

RHIC-AGS’09, J. Putschke(from his back-up slides)

Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

19Jet suppression modification
with 2-particle Δφ correlation

RHIC 200GeV

RHIC 62GeVSPS 17GeVPHENIX
nucl-ex/0611019

S.Kniege, ISMD 2007

Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

20

h-h correlation at “p+p 200GeV” vs “Au+Au 200GeV central 0-20%”
trigger pT window

associate pT window

Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

21RP dependent correlations

near-side

QM09, C. H. Chenaway-side

QM04: STAR

in-planeout-of-plane

in-plane

Heavy Ion Pub, 10/Jul/2009, Nagoya

out-of-plane

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

22Jet modificationand geometry(and v2)

QM08: STAR, PHENIX

STAR3<pTtrig<4GeV/c & 1.0<pTasso<1.5GeV/c 20-60%

Mach-cone shape depends on R.P. angle.
Mach-cone is a source of of v2

Δφ = φassociate - φtrigger (rad)Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

23Au+Au, 200 GeV“jet”IAPYTH

p+pSTAR

QM08 STAR)Δφ(radaway side (in dφ) of one
di-jet can be near side(in dφ) of another di-jet

Heavy Ion Pub, 10/Jul/2009, Nagoya

STAR Preliminary

Jet does not depends on it
Jet reduces v2

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

Jet

Ridge shape depends on R.P. angle.
Ridge is a source of of v2

Ridge

3<pTtrig<4, 1.5<pTtrig<2.0 GeV/c24

p+p andperipheral
Au+Aucentral
Au+Au

TInclusive ~ TShoulder ~ TRidge < TJet(<)(<)

STAR Preliminary
QM06

inclusiveridgejet

QM08

Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

25

Relatively lower pT region (1~4GeV/c)

Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

26

QM09, W. G. Holzmann

HeadShoulder

head: yield confirms simple picture ofenergy loss vs. path length; in- and outof-plane show similar away-side width
shoulder: geometry effects harder todisentangleHeavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

27

QM09, S. Esumi

thin sidemach-cone(shoulder region)
φASS -φO TRIG >0φASSO-φTRIG<0Trigger angle selected withrespect to the 2nd moment
event plane [-π/2,π/2] to probe
the participant geometrymach-cone(shoulder region)
φASSO-φTRIG<0thick side
If trigger angle is fixed around +/-(π/4), the associateparticles emitted left or right w.r.t. trigger direction wouldfeel the different thickness of the almond. It is because
the almond shaped medium is asymmetric w.r.t. jet axis.
Heavy Ion Pub, 10/Jul/2009, Nagoya-π0φASSO - φTRIG

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

π28Angle (4)/(5) (mid-central)
200GeV Au+Au -> h-h (run7)c2(data) - c2(flow)

left/right asymmetry(pTTrig=2~4GeV/c, pTAsso=1~2GeV/c)

mid-central : 20-50%(5) φs=[0,1]π/8(4) φs=[-1,0]π/8right

(1)

left

(8)

(2)

(7)

(3)

(6)

(4)

(5)

(5)

(4)(6)(3)left(7)

(2)
(8)

(1)

in-planeright

φs = φTrig. - ΦR.P.
[-π/2,π/2]

PHENIX preliminary

in-plane
associateregions

Δφ = φAsso. - φTrig. (rad)Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

29

Angle (3)/(6) (mid-central)
200GeV Au+Au -> h-h (run7)c2(data) - c2(flow)

left/right asymmetry(pTTrig=2~4GeV/c, pTAsso=1~2GeV/c)

mid-central : 20-50%(6) φs=[1,2]π/8(3) φs=[-2,-1]π/8right(1)left(8)(2)(7)(3)(6)(4)(5)

(5)

(4)

(6)

(3)

left(7)

(2)
(8)

(1)

in-planeright

φs = φTrig. - ΦR.P.
[-π/2,π/2]

PHENIX preliminary

in-plane
associate
regionsΔφ = φAsso. - φTrig. (rad)Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

30

Angle (1)/(8) (mid-central)
200GeV Au+Au -> h-h (run7)c2(data) - c2(flow)

left/right asymmetry(pTTrig=2~4GeV/c, pTAsso=1~2GeV/c)

mid-central : 20-50%(8) φs=[3,4]π/8(1) φs=[-4,-3]π/8right

(1)

left

(8)

(2)

(7)

(3)

(6)

(4)

(5)

(5)

(4)

(6)

(3)

left

(7)

(2)
(8)

(1)

in-planeright

φs = φTrig. - ΦR.P.
[-π/2,π/2]

PHENIX preliminary

in-plane
associate
regionsΔφ = φAsso. - φTrig. (rad)Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

31(4) φs=[-1,0]π/8(5) φs=[0,1]π/8200GeV Au+Au -> h-h (run7)(pTTrig=2~4GeV/c, pTAsso=1~2GeV/c)

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

in-planetrigger selection(3) φs=[-2,-1]π/8(6) φs=[1,2]π/8

FNear

FAway+ Faway-φAsso. - φTrig. (rad)Fitting with 3 Gaussian functions(2) φs=[-3,-2]π/8(7) φs=[2,3]π/8

Gauss function : F(height, mean, width)
FNear(A0, D0, S0) + FAway+(A+ , D+ , S+)+ FAway-(A- , D- , S-)| π - D+ | = | D- - π | ,S+= S-(1) φs=[-4,-3]π/8(8) φs=[3,4]π/8out-of-plane
trigger selection

average

Fitted data with3 Gauss func.

PHENIX preliminary
Heavy Ion Pub, 10/Jul/2009, Nagoya

Δφ = φAsso. - φTrig. ShinIchi(rad) Esumi, Inst. of Physics, Univ. of Tsukuba

32

Results on fitting parameters(1)

near side peak position
left/right asymmetry
D0 (rad)

FNear

FAway+ Faway-(6)

(4)

(5)

(5)

(4)

(6)

(3)

Fitting with 3 Gaussian functions
Gauss function : F(height, mean, width)
FNear(A0, D0, S0) + FAway+(A+ , D+ , S+)+ FAway-(A- , D- , S-)| π - D+ | = | D- - π | ,S+= S--++ve Δφ away
enhanced

Heavy Ion Pub, 10/Jul/2009, Nagoya(7)

in-plane

(2)
(8)

(1)

φs = φTrig. - ΦR.P.
[-π/2,π/2]

away side shoulder
peak position| D+/- - π | (rad)away side shoulder heightleft/right asymmetry(A - A )0.5 (A+ + A- )consistentwith thespeculation

20 ~ 50 %

(7)

(3)

φAsso. - φTrig. (rad)-ve Δφ nearshifted(8)(2)

200GeV Au+Au (run7)
hadron-hadron(pTTrig=2~4GeV/c,pTAsso=1~2GeV/c)
PHENIXpreliminary

φs = φTrig. - ΦR.P. (rad)ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

33Summary Data for
Left/right asymmetry(pTTrig=2~4GeV/c, pTAsso=1~2GeV/c)

mid-central : 20-50%

peripheral : 50-93%c2(data) - c2(flow)

central : 0-20%

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

in-plane(5) : φs=[0,1]π/8
middle(6) : φs=[1,2]π/8
out-of-plane (8) : φs=[3,4]π/8

Heavy Ion Pub, 10/Jul/2009, Nagoya

PHENIX preliminaryΔφ = φAsso. - φTrig. (rad)ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

34

QM09, B. Betz

Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

35

AMPT (v1.11, parton cascade with string melting v2.11) Au+Au at sqrt(sNN)=200GeV
(1)

(8)

(true) reaction plane aligned correlation function

(2)

(7)
(6)

(3)
(4)

(5)

(5)

(4)

(6)

Similar trend as
seen in experiment

(3)
(7)

(2)
(8)

(1)

trend is reversed

perfect R.P. resolution
no v2 subtraction needed
Heavy Ion Pub, 10/Jul/2009, Nagoya

4~18%
b = 3.5~7 (fm)44~%
b = 10.5~ (fm)φAsso. - φTrig. (rad) with trigger angle selected w.r.t. R.P.
ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

36Bin 5

J.Jia, R.Wei, S.E, arXiv:0903.3263

Mach cone1

If the multiplicities
reduces with the path
length because ofabsorption...

Bin 0

Note: original jets aregenerated according
to Ncoll profile
Mach cone 2
kT smearing included,
modified mach-cone byabsorption according toEloss. The asymmetry is
now flipped.
punch through jets included,smeared with R.P. resolution

cone1

cone2
φASSO - φTRIG (rad)Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

37

Simulation

4 different jet shape assumptions for MC input

jet shape #1

jet shape #2

jet shape #3

jet shape #4

near- and awayside dependence

only away-side
dependence

only near-side
dependence

no R.P.
dependence

φASSO - φTRIG (rad)Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

38

nTrig / eve (soft) = 3
nAsso / eve (soft) = 8
nJet / eve (hard) = 1
nPTY / jet (hard) = 1.25

v2,4Trig (soft) = 0.2, 0.029
v2,4Asso (soft) = 0.13, 0.010
v2,4Jet (hard) = 0.2, 0.0
v2,4PTY (hard) = 0.15, 0.0

jet shape #2

jet shape #1

Comparison with data would tellus that there should be nearand away-side modification inexperimental data.
jet shape #3

Simulation

jet shape #4

There should also be a strong effect on v2 , much stronger effect on v4.

v2(high)=0.20 ---> 0.20
v4(high)=0.029 ---> 0.022
v2(low)=0.13 ---> 0.15
v4(low)=0.010 ---> 0.016

v2(high)=0.20 ---> 0.20
v4(high)=0.029 ---> 0.022
v2(low)=0.13 ---> 0.14
v4(low)=0.010 ---> 0.014

v2(high)=0.20 ---> 0.20
v4(high)=0.029 ---> 0.022
v2(low)=0.13 ---> 0.13
v4(low)=0.010 ---> 0.012

v2(high)=0.20 ---> 0.20
v4(high)=0.029 ---> 0.022
v2(low)=0.13 ---> 0.12v4(low)=0.010 ---> 0.009

φASSO - φTRIG (rad)Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

39

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

Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

40

Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

41

Y.Miake (Tsukuba)presented at the upgrade meeting
during the last ALICE week, 29/JunHeavy Ion Pub, 10/Jul/2009, NagoyaShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

42

γ in
PHOS/J-cal

Recoil Di-jet ETjet1>70GeV

π0 in
PHOS/J-cal

EM-cal

EM-calRecoil γ-jet ETγ>30GeV

Recoil π0-jet ETπ0>30GeVjet (R<0.3)
in J-cal

EM-calHeavy Ion Pub, 10/Jul/2009, Nagoya

M. Sano,H. Yokoyama,
Grad. Student of Tsukuba
ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

43

Pythia (p+p) jet

Pyquen jet(quenched)

1/NTRIG dNASSO/dφ

ETTRIG > 80GeVETASSO = 20~40GeVETTRIG > 80GeVETASSO = 40~80GeV

Di-jet simulation
at 5.5TeV
betweenpythia (p+p)
andpyquen(quench model)

out-ward trigger
in-ward trigger

out-ward

in-wardETTRIG > 80GeVETASSO > 80GeV

D. Sakata,Grad. Student of Tsukuba
Δφ = φJetAsso - φJetTrig (rad)Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

44

Improvement in jet energy resolution

Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

45Summary
QGP tomography has started using Jets
and Di-Jets, Gamma-Jets, Mach-cone, Ridge.
Jet modification does have an strong implication
to flow/event anisotropy interpretations.
We will continue in RHIC-PHENIX,
and prepare for LHC-ALICE withadditional J-cal opposite side of EMcal.

Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

46

QM09, A. Hamed

Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

47

QM09, A. Majumder

Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba48

nTrig / eve (soft) = 3
nAsso / eve (soft) = 8
nJet / eve (hard) = 1
nPTY / jet (hard) = 1.25

v2,4Trig (soft) = 0.2, 0.029
v2,4Asso (soft) = 0.13, 0.010
v2,4Jet (hard) = 0.0, 0.0
v2,4PTY (hard) = 0.0, 0.0

Simulation

jet shape #1

jet shape #2

jet shape #3

jet shape #4

v2(high)=0.20 ---> 0.15
v4(high)=0.029 ---> 0.022
v2(low)=0.13 ---> 0.14
v4(low)=0.010 ---> 0.015

v2(high)=0.20 ---> 0.15v4(high)=0.029 ---> 0.022
v2(low)=0.13 ---> 0.13
v4(low)=0.010 ---> 0.014

v2(high)=0.20 ---> 0.15
v4(high)=0.029 ---> 0.022
v2(low)=0.13 ---> 0.12
v4(low)=0.010 ---> 0.011

v2(high)=0.20 ---> 0.15
v4(high)=0.029 ---> 0.022
v2(low)=0.13 ---> 0.11
v4(low)=0.010 ---> 0.009

φASSO - φTRIG (rad)Heavy Ion Pub, 10/Jul/2009, Nagoya

ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

49

200GeV Au+Au -> h-h (run7)(pTTrig=2~4GeV/c, pTAsso=1~2GeV/c)central : 0-20%

mid-central : 20-50%

peripheral : 50-93%

blue data points are +/-Δφ flipped.
in-plane(5)(6)

average(8)

out-of-plane(7)

PHENIX preliminary
Heavy Ion Pub, 10/Jul/2009, Nagoya

Δφ = φAsso. - φTrig. (rad)ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

50

200GeV Au+Au -> h-h (run7)(pTTrig=2~4GeV/c, pTAsso=1~2GeV/c)
mid-central : 20-50%
(5)

(4)

(6)

(3)

(7)

(2)

(8)

(1)

peripheral : 50-93%averageout-of-plane

in-planecentral : 0-20%

PHENIX preliminary
Heavy Ion Pub, 10/Jul/2009, Nagoya

Δφ = φAsso. - φTrig. (rad)ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba

51