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J-Cal Overview

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

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  1. 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

  2. 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

  3. 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

  4. EMC-1 EMC-3 EMC-5 JCal-2 JCal-1 Beam View Jcal-3 4 Thanks to Lars

  5. 45 deg Side View Vertex Edge of TPC Edge of PHOS Thanks to Lars

  6. 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

  7. 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

  8. 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

  9. 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)

  10. 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

  11. 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

  12. 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

  13. Effects on energy and φ balance PYQUEN, detector resolution not included See talk by H. Yokoyama

  14. 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

  15. 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

  16. 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

  17. 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.

  18. 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

  19. 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

  20. Backup

  21. Energy Resolution PYTHIA8, detector resolution included Rcone = 0.2 Rcone = 1.0

  22. 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

  23. 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

  24. P. Panel on baby frame Phos Acces A side Floor in L3

  25. 1565 795 770

  26. 1200 3700 1145 1183

  27. 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

  28. 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.

  29. 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

  30. Jet Tomography Jet Tomography Positron EmissionTomography • Final tool to prove structure of the dense matter M. Gyulassy ?

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