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Naohito SAITO (KEK)

Overview of Muon Trigger Upgrade - its Scientific Motivation and Project Status – BNL Review of Muon Trigger Upgrade for PHENIX September 25, 26, 2008. Naohito SAITO (KEK). Dark Matter. Dark Energy. Cosmic Energy Budget. Ordinary Matter. Nucleon 100 Neutrino 0.16 Photon 0.23.

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Naohito SAITO (KEK)

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  1. Overview of Muon Trigger Upgrade- its Scientific Motivation and Project Status –BNL Review of Muon Trigger Upgrade for PHENIXSeptember 25, 26, 2008 Naohito SAITO (KEK)

  2. Dark Matter Dark Energy Cosmic Energy Budget Ordinary Matter Nucleon100 Neutrino0.16 Photon0.23 More than 99% of VISIBLE Universe is Nucleon

  3. Why Spin? • Fundamental Concept in Physics • Appears in Many Different Levels • Galaxy to Space-Time Structure • Fundamental Quantum Number for Elementary Particles • Important in Symmetry Test • Parity • Time Reversal

  4. unpolarized distribution q(x,Q2)= = helicity distribution Dq(x,Q2)= transversity distribution g(x,Q2)= dq(x,Q2)= Dg(x,Q2)= No Transverse Gluon Distribution in 1/2 Parton Distribution Functions • Quark Distributions • Gluon Distributions

  5. Crisis Proton Spin • SLAC：Pol’ electron scattering • Consistent with QM • CERN：Pol’ muon • Discovery of Anomaly • Q-Spin Cont: DS ~ 0 • DESY：Pure Proton • Confirm Anomaly • SLAC＆CERN：Hi Precision • Establish Anomaly • DS ~ 0.1-0.3

  6. k’ k q Elastic p’ p P xP= Lepton Scattering Experiments • Scattering by Virtual Photon • ONLY sensitive to charge squared • ONLY quarks and anti-quarks • Cannot separate them • Two Surprises: • ONLY 25% ! • Negative Sea ! Up：＋８０％ Down：－４5％ Strange：－１０％ Total：＋25％ Gluon?

  7. Ecal2 & Hcal2 m filter 2 m filter 1 SM2 RICH-1 Ecal1 & Hcal1 SM1 RICH-2 SAS • 2-stage spectrometer • LAS (Large angle)Kp • SAS(Small angle) LAS Pol.m Beam: Pol.Target Spin Physics Experiments • COMPASS • Pol.m • HERMES • Pol.e± • JLab Exp’s • Pol.e- • RHIC Spin • Pol. pp • BELLE • e+e-

  8. Sea Quarks are Polarized? • Flavor sensitive measurements required • Semi-inclusive • Weak interaction • W production • Neutrino scattering …

  9. Probing the Proton Structure • EM interaction • Photon • Sensitive to electric charge2 • Insensitive to color charge • Strong interaction • Gluon • Sensitive to color charge • Insensitive to flavor • Weak interaction • Weak Boson • Sensitive to weak charge ~ flavor • Insensitive to color

  10. Flavor is almost fixed W+ Production in pp Collisions • Only Left-Handed Quark and Right-Handed Anti-quark will contribute • No Right-Handed Current Observed So far Neutrinonm Up W+ Anti-muon m+ Hi-momentum Anti-down • Best suited for Spin-Flavor Structure Studies! Polarized pp Collisions at 500 GeV!

  11. Projected Sensitivity • Forward and Backward Asymmetries • Momentum resolution is fully incorporated

  12. BNL NY City RHIC RHIC: The QCD Machine • Two indep. Rings with 3.83 km circumference • 120 bunches/ring • 106 ns bunch interval • Max. Energy • p-p 250 + 250 GeV • Au-Au 100/N + 100/N GeV • Luminosity • p - p 1.6 x1032 cm-2s-1 • Au-Au 2x1026 cm-2s-1

  13. RHIC Accelerator Complex

  14. PHENIX Experiment • 光子、電子、ミューオンそしてハドロンの精密検出を目指した検出器

  15. Current Muon System • North and South Arms • DOE, RIKEN, and PHNX-F • Muon Tracking Chambers • 3 stations of Cathode strip chambers • 3 gaps + 3gaps + 2 gaps • Each gap has non-stereo-plane, stereo-plane, and anode plane • Muon Identifier • 5 layers of Iarocci tubes in x and y directions • 80 cm of steel plate absorber (total) • Provides LL1 trigger based on road-finding MuID MuTr St#1 St#2 St#3 Same configuration in South

  16. Trigger Rate and Rejection REAL DATA Design Luminosity √s = 500 GeV σ=60mb L = 1.6 x1032/cm2/s m momentum dist. At vs=200 GeV PT>10GeV/c HQ signal Total X-sec rate＝9.6 MHz PT>20GeV/c DAQ LIMIT =1-2 kHz （for μ arm） W signal 25 50 Required RF 10,000 Momentum GeV/c Need Momentum Selectivity in the LVL-1 Trigger! BUT MuID LL1 RF=200 ~ 500

  17. Muon Trigger Upgrade RPC3 • Motivation • Momentum sensitivity • Solid timing information • Additional and Crucial redundancy in off-line tracking • Proposed Scheme • MuTr FEE Upgrade • Steal 10% cathode signal to produce LL1-primitives • Resistive Plate Counter • Fast response • Wide area coverage with thin configuration is possible • Two stations RPC1 and RPC3 inthe initial stage MuTr RPC1 St#1 St#2 St#3 Same configuration in South

  18. Muon Tracking System+RPC 3 2 4 5 1 RPC3 RPC1 IP 6 8 3 Station 3 7 South Arm (1) 2 4 Station 2 North Arm (2) Station 1 5 1 Station 1 6 8 Station 2 7 Station 3 Gap 3 Gap 2 From IP Gap 1

  19. How New Trigger Works? • Search for a Stiff Track ONLINE! • Slow MuTr could trigger with INCOMING tracks • Fast RPC will reject them

  20. RHIC Spin Physics Program • Brief History • 1990: Polarized Collider WS in Penn-State U • 1991: RHIC Spin Collaboration Formed • 1993: PHENIX and STAR integrated Spin Program • 1995: RIKEN-BNL Collaboration (~$20M) • 2002: First Polarized Proton Collision! • 2005: RPC project approved (NSF) • 2006: Both MuTr FEE upgrade (JSPS) • 2008: Complete North Arm Installation with MuTrg FEE + South MuTrg FEE + RPC prototype First Commissioning of 500 GeV in Run 9

  21. Completion of the Upgrade • 2008: MuTRG North and RPC Prototype-D • 2009: MuTRG South and RPC 3 North • 2010: RPC3 South • 2011: RPC1 North and South

  22. Budget Profile $K NSF+UIUC • NSF($2M) + institutional($0.3M) and JSPS ($2M) Run09 Run10 Run11 Run12 Run13 FY06 FY07 FY08 FY09 FY10 FY11 FY12 FY13 JFY06 JFY07 JFY08 JFY09 JFY10 Next RIKEN Program Current RIKEN Program JSPS Today Need Results End

  23. Collaboration • Abilene Christian University • University of California, Riverside • CIAE, Beijing • University of Colorado, Boulder • Columbia University and Nevis Laboratory • Georgia State University • University of Illinois, Urbana • Iowa State University • KEK • Korea University • Kyoto University • Los Alamos National Laboratory • Muhlenberg College • University of New Mexico • Peking University, Beijing • RIKEN Brookhaven Research Center • RIKEN • Rikkyo University

  24. Summary • W production in pp collisions is very useful tool to understand the spin-flavor structure of the nucleon • PHENIX Muon Trigger Upgrade is Crucial for the W measurement • We are getting ready for the first commissioning of W physics with 500 GeV pp collisions • We appreciate your critical review to verify the earliest and successful realization of the W program

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