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J-Cal Overview. Extension of EM-Cal for B-to-b jet capabilities. Yasuo MIAKE Univ. of Tsukuba. S. Esumi, T. Horaguchi H. Yokoyama, M. Sano T. Chujo. Y. Miake, April.,7, 2009 @ LBNL. What is J-Cal. (ΔΦ,Δη) ~ (0.025,0.025). J-Cal consists of 3 super modules of the EMCAL

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j cal overview
J-Cal Overview

Extension of EM-Cal forB-to-b jet capabilities

  • Yasuo MIAKE
  • Univ. of Tsukuba

S. Esumi, T. Horaguchi

H. Yokoyama, M. Sano

T. Chujo

Y. Miake, April.,7, 2009 @ LBNL

what is j cal
What is J-Cal

(ΔΦ,Δη) ~ (0.025,0.025)

  • J-Cal consists of 3 super modules of the EMCAL
    • Same design, same material, same electronics as the ALICE EMCAL
  • J-Cal sits on the other side of ALICE EMCAL detecting Back-to back jet
      • J-Cal, extension of EM-Cal coverage for Jets !!
        • J as Jet, Japanese,,,

module

J-Cal

3 Super Module

36 x 24 =864 modules

(ΔΦ,Δη)~(1.0, 0.7)

2

where is j cal

ALICE EMCAL

3 supermodule(ΔΦ,Δη) ~(1.0, 0.7)

Where is J-Cal
  • In φ, it is on the other side of ALICE EMCAL
  • In η, it is next to the PHOS

eta view of ALICE & J-CAL

eta view of ALICE & J-CAL

J-Cal

5

beam view

EMC-1

EMC-3

EMC-5

JCal-2

JCal-1

Beam View

Jcal-3

4

Thanks to Lars

side view

45 deg

Side View

Vertex

Edge of TPC

Edge of PHOS

Thanks to Lars

physics motivations

PHENIX, arXiv:0705.3238 [nucl-ex]

pedestal and flow subtracted

Physics Motivations
  • Study of jets hopefully with PID (Parton ID)
    • Jet quench
    • Mach cone
    • Tomography

J-Cal improve Back-to back jets performance in ALICE

  • Define B-to-B jets
  • Trigger B-to-B jets
our wish
Our wish

RHIC

LHC

  • We want to see mach cone with away side jet Ejet > ~ 50 GeV at LHC.

V.S. Pantuev, arXiv:hep-ph/0701.1882v1

jets gamma jet dijet
Jets; Gamma-Jet & DiJet
  • Gamma-Jet
    • Quark Jet
    • Easier analysis (no energy loss for gamma)
    • Smaller rate
    • Inclusive meas.
    • Reaction plane dependence

Partonic Energy Loss

  • Di-Jet
    • Mostly Gluon Jets
    • x1000 higher rate, thus higher statistics
    • Semi-exclusive meas. can be done w.r.t. reaction plane, centrality & pt of jets
key issues resolutions

φ1

PYTHIA8

ΦJET1-ΦJET2

pt = 40 GeV/c

80

120

Rcone < 0.2

Ejet1

φ2

Ejet2

Key issues; resolutions
  • Good characteristics of Back-to back jets
    • Origins clean
    • Kinematically clean
      • Energy balance
      • back-to back in phi
  • Need to have better resolutions
      • RMS of (φ1-φ2)
      • RMS of (Ejet1-Ejet2)
energy resolution
Energy resolution

PYTHIA8, detector resolution included

  • Statistical fluctuation in neutrals determines the resolution.
  • J-Cal improves the resolution from ~45% to ~35%
  • Imbalance in energies provides information on the partonic energy loss.

Rcone = 0.2

TPC - TPC

TPC - EMC

J-Cal - EMC

γ-Jet: J-Cal - EMC

Dijet Intrinsic

See talk by H. Yokoyama

b to b balance in
Δφ B-to-b balance in φ

PYTHIA8, detector resolution included

  • Better phi resolution helps a lot finding jets in heavy ion environment

Rcone = 0.2

TPC - TPC

TPC - EMC

J-Cal - EMC

Dijet Intrinsic

γ-Jet: J-Cal - EMC

effect of the energy loss
Effect of the energy loss

PYQUEN; detector resolution not included

  • Jet energy reduces from 100 GeV to 80 GeV in central Pb+Pb at pThat =100 GeV event

Pb+Pb central(5%), pThat = 100 GeV

effects on energy and balance
Effects on energy and φ balance

PYQUEN, detector resolution not included

See talk by H. Yokoyama

rates

Thanks – Peter Jacobs

Rates

From slides shown by J. Harris at Tamura Symposium, Nov. 2008

  • 1 month running/year
  • 104 events/year
  • Using Day-1 ALICE with J-Cal
    • Establish Dijets Axis up to100~150 GeV
  • 3 orders of magnitude larger than gamma-Jet

See talk by S. Esumi

Full Dijets reconstruction by EMCAL+JCAL

j cal doubles jet yield

J-

X

J-Cal doubles γ-Jet yield
    • γin PHOS and J-cal, jet in EM-Cal.
    • Thanks to Peter Jacobs
  • J-Cal doubles rate of γ-Jet
  • leading pi0 may be improved by a factor of 10!
    • Need simulations

Thanks to Peter Jacobs

YMiake, Mar.,24, 2009 @ CERN

jet trigger in pb pb

Fig.8.4 of TDR

Backgrounds

Rcone = 0.2

Ejet = 100 GeV

50 GeV

Rcone

Jet trigger in Pb+Pb
  • With Rcone = 0.2, triggering jet of < 50 GeV becomes difficult.
  • Back-to back
summary
Summary
  • J-Cal (EM) for back-to back jet performance
      • Improve Resolutions ; ~45% to ~35 %Acceptances ; 3 x γ-jetsTrigger ; (to be done)
  • Funding
    • At least 1 SM EMC is already granted at Tsukuba.
    • The rest of the money in negotiation.
  • Full collaboration (asking help) with US-EMCal
    • Dec, 2008, T.Chujo w. 2 students @ Wayne State
    • Arp, 2009, 2 students (M. Sano, H. Yokoyama) stay 2 months @LBNL
    • J-Cal proposal at the next ALICE week (June, 2009), see talk by Y. Miake.
    • Preparation for the analysis tool at Tsukuba, see talk by T. Horaguchi.
f a q
F. A. Q.
  • Why not with PHOS?
    • For jets, eta coverage of PHOS is too narrow.
    • Cone radius of >0.2 needed
    • J-Cal + Phos works better
  • Why not with γ-Jet?
    • Rates.
    • DiJets & γ-Jet will play complimental role
fluctuation with limitation

Charged

(2/3)

~15@100Gev

EJET

Fragmentation

Neutral

(1/3)

~7@100Gev

Fluctuation with limitation
  • Statistical fluctuation with total energy limitation
    • Total jet energy is fixed.
      • fluctuation of neutral play significant role

EJET=ECHARGED+ENEUTRAL

CDF, PRL94(2005)171802

dECHARGED = -dENEUTRAL

energy resolution1
Energy Resolution

PYTHIA8, detector resolution included

Rcone = 0.2

Rcone = 1.0

control variables required for heavy ion exp
Control variables requiredfor Heavy Ion Exp.
  • Since heavy ion collisions is so complicated, while there is no ‘standard model’, we need to measure heavy ion collisions w. many control variables.
    • Centrality / impact parameter of collisions
    • Reaction Plane Angle
    • Yet, another control variable for the next generation experiments ;

→ Jet Axis

budget grant in aid jsps

第1モジュール

D1 渡邊健悟

M2 佐野正人

M2 坂田洞察

M1 横山広樹

M1 浜田英太郎

M1 梶谷緑

M1 轟木

M1 木村瑞希

2008

2009

2010

2011

2012

第2モジュール

測定器完成

トリガー導入

搬入

第3モジュール

テスト実験

設計計算

検出器製作

第4モジュール

開発・試験

陽子・陽子衝突における測定と研究

鉛・鉛衝突における測定と研究

個別要素試験

pp物理解析・評価

成果発表

システムテスト

PbPb物理解析・評価

Tomography解析

最終製作図面

トリガープログラム試験

GEANT4開発

解析プログラム開発

トリガープログラム開発

2008.4.1現在

Budget (Grant in Aid,JSPS)
  • Total of ≲1 M$ in 5 yrs is granted.

YMiake, Mar.,24, 2009 @ CERN

slide24

P. Panel on baby frame

Phos

Acces A side

Floor in L3

slide25

1565

795

770

slide26

1200

3700

1145

1183

possibility of parton id
Possibility of Parton ID
  • As a new generation exp., from Particle ID to Parton ID !
    • According to CDF exp., charged/neutral works
  • Might be very difficult in heavy ion environment
  • Nevertheless, challenge!
  • It becomes feasible for higher pt jet

CDF, PRL94(2005)171802

gluon jet

quark jet

27

scenario at rhic
Scenario at RHIC

V.S. Pantuev, arXiv:hep-ph/0701.1882v1

STAR, arXiv:nucl-ex/0701074

  • Claims
    • Stopped parton is the source of ridge as well as Mach cone.
    • This happens only at the surface
    • There should be velocity boost at the ridge region (pi,K,p)
    • v3 components independent of R.P.
at higher energies
At higher energies,

V.S. Pantuev, arXiv:hep-ph/0701.1882v1

  • Dijets with energy un
  • Mach cone with away side jet.
  • Higher, the better;
    • Clear separation in momentum and φ
jet tomography
Jet Tomography

Jet Tomography

Positron EmissionTomography

  • Final tool to prove structure of the dense matter

M. Gyulassy ?