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PHENIX: The Next BUP and the Next Decade

PHENIX: The Next BUP and the Next Decade. J. Lajoie for the PHENIX Collaboration. Charge from Steve Vidgor. ALD Steve Vigdor has charged PHENIX and STAR to write decadal plans due August 1, 2010. Summarize detector upgrades underway and to be utilized in the next 5 years.

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PHENIX: The Next BUP and the Next Decade

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  1. PHENIX: The Next BUP and the Next Decade J. Lajoie for the PHENIX Collaboration RHIC Spin Collaboration Meeting

  2. Charge from Steve Vidgor ALD Steve Vigdor has charged PHENIX and STAR to write decadal plans due August 1, 2010. • Summarize detector upgrades underway and to be utilized in the next 5 years. • Compelling science beyond 5++ years that require additional detector upgrades and machine capabilities. • Prioritize the physics and the upgrades above. • Discuss the option of an electron beam in the tunnel and thus an ePHENIX and eSTAR in the MeRHIC and EIC era. RHIC Spin Collaboration Meeting

  3. Caveats • The PHENIX BUP for Run11-12 is still in development • Still, it’s relatively straightforward • The PHENIX Decadal Plan is a moving target • Active effort within the PHENIX Collaboration • As of now, there is no “official” Decadal Plan • What you will see is my take on the current process • Of course, it’s probably biased • PHENIX has decided to THINK BIG! • RHIC will have no future if it does not pursue exciting new physics discoveries! RHIC Spin Collaboration Meeting

  4. The Next Five Years Run-10 Run-11: Silicon VTX on schedule. Precision heavy flavor era! Muon Trigger Upgrade on schedule! Forward Wm DAQ Upgrade on schedule! Run-12: Forward silicon VTX available. Run-14: Forward Calorimetry (FOCAL proposal) Critical to exploit the detectors to do the physics they were designed for. RHIC Spin Collaboration Meeting

  5. High Precision Heavy Flavor RHIC Spin Collaboration Meeting

  6. The FOCAL • Si-W calorimeter • 44cm from the interaction point • Replaces existing Cu nosecone • Modular Brick construction • Physics Goal • Gluon PDF at low-x via direct photons • This is a very new type of detector! • A hybrid between a calorimeter and a tracking detector RHIC Spin Collaboration Meeting

  7. The PHENIX Run-11/12 BUP • Run-11: • Anticipate an even split between AuAu and 500GeV pp running: • pp – commissioning/physics with muon trigger and VTX • AuAu – first physics running with VTX • Considering how useful ~1-2 weeks of U+U running would be • Run-12: • Additional physics running at 500GeV • HI running with VTX and FVTX • Will ask for some pp low energy running (HI comparison – 62.4, 39, 22.4 GeV) • Some AuAu low energy running • Excitation of constituent quark scaling (~20GeV) RHIC Spin Collaboration Meeting

  8. Run-11 Spin Goals and Assumptions • PHENIX wants to emphasize that 500GeV polarized running in Run-11 is commissioning for both the collider and PHENIX • New PHENIX Muon Trigger • New VTX detector • Assuming ~10 weeks of 500 GeV running, this should be broken into two parts: • First ~4 weeks: Collider commissioning, detector setup • Expect priority is on luminosity and polarization development, beam for experiments on evenings • Next 4-5 weeks: Physics running for W AL • Emphasis on stable running conditions • PHENIX assumes it will integrate ~50pb-1 RHIC Spin Collaboration Meeting

  9. Run-11 Expectation AL W->m Assumes 50pb-1, P=50% S/B=0.3 – Believe we can ultimately achieve S/B=3.0, but this requires additional analysis and development S/B uncertainty shown as gray box Run-11 is the beginning of the W physics program… RHIC Spin Collaboration Meeting

  10. PHENIX Near-Term Spin Goals • Main PHENIX focus is W physics! • Need to insure we accumulate sufficient integrated luminosity • Expect to run at least three years • Run-11 through Run-13? • Additional spin physics efforts: • Longitudinal (500GeV): • ALL for p0, h, charm, direct photons • Transverse (depends on running): • IFF, AN for charm • Could be 200GeV (HI comparison running) • Particle correlations over a range of rapidities RHIC Spin Collaboration Meeting

  11. Long-Term HI Physics Objectives Hot QCD Medium q: fast color triplet Jets and Leading Hadrons q: fast color octet C: slow color octet Heavy Flavor B: slower color octet QQ: slow color singlet/octet J/y and Upsilons QQ: fast color singlet/octet High pT J/y Photon: colorless RHIC Spin Collaboration Meeting

  12. How to Upgrade PHENIX? Step #1: Remove the outer PHENIX Central Arms Step #2: Replace Axial Field Magnet with Solenoid (2 Tesla with inner radius = ~70 cm). Step #3: New silicon tracking layers at 40 and 60 cm Step #4: Compact EmCal (Silicon/Tungsten) |h|<1.0 8 cm total depth and preshower layer Step #5: Hadronic Calorimeter Outside Magnet Step #6: Maintain high DAQ bandwidth and triggers Result  PHENIX Reborn RHIC Spin Collaboration Meeting

  13. sPHENIX? sPHNX? A complete redesign of PHENIX focused on the next generation of physics questions at RHIC. 145cm HCAL 80cm 68cm EMCAL 2T Solenoid Preshower 60cm Silicon Tracker VTX + 1 layer IP Silicon Tracker FVTX 1.2 < h < 2.7 8o < q < 37o RHIC Spin Collaboration Meeting

  14. electrons E= 5 GeV p+ E= 5 GeV GEANT4 Performance Evaluation Excellent electron-ID for pT > 2 GeV Need detailed study at lower pT as well. g/p0 separation over full kinematics > 50 GeV p0 E=40 GeV Energy Resolution RHIC Spin Collaboration Meeting

  15. Jet Reconstruction FastJet (anti-kT) FastJet (anti-kT) Mike McCumber (Colorado) With tracking, dominated by “fakes” above some pT (e.g. pT > 10 GeV). Thus, low overall efficiency for true high energy jets. Bias in spectra reconstruction when FF is uncertain. Issue largely solved with EMCal + HCal for jet energy! RHIC Spin Collaboration Meeting

  16. Forward Physics Objectives • Transverse spin phenomena • Kinematics high xf, high rapidity |h| > 2 • Drell-Yan test QCD prediction for Sivers between SIDIS and DY • Separate Sivers and Collins and do a flavor separation for the PDFs • p0-jet, g – jet, IFF for identified hadrons, • jet AN, direct photon • Longitudinal spin phenomena • high rapidity |h| > 2  extend x coverage for DG and Dq • Drell-Yan in dAu • Measure quark distributions in nuclei • Possible access to quark saturation • EIC physics • Measure polarized and unpolarized inclusive structure functions in ep / eA (F2, FL, F3, g1, g2, g5) • “Diffractive physics” (DVCS, etc.) RHIC Spin Collaboration Meeting

  17. What is Required? • All measurements need increased acceptance in the forward direction (|h|>2) than the current muon arms provide • Apart from DY all the measurements require EM calorimetry and PID • DY can be done with muons and/or electrons  so no disadvantage • Hadronic calorimetry required for Transversity+Collins (similar jet reconstruction issues as Central PHENIX) RHIC Spin Collaboration Meeting

  18. Scenario I: DY at High h MPC 3.1 < | h | < 3.9 2.5o < Q < 5.2o Muon Arms 1.2 < | h | < 2.4 South: 12o < Q < 37o North: 10o < Q < 37o Central Arms | h | < 0.35 60o < Q < 110o Keep South Muon arm and put m-detectors in the gap between MuTr/MuID. May require dipole magnet before muon piston iron. Upgraded FVTX required to cover acceptance. RHIC Spin Collaboration Meeting

  19. Scenario I Pros and Cons • Advantage: • Modest upgrade • Cost if no magnet is needed around ~2-3M$ • Many technologies available  RPC • If additional magnet is needed modifications become significantly more involved  higher costs ~5M$ • Disadvantage: • Very limited physics capabilities • Only possible in south muon arm (no gap in north muon arm) RHIC Spin Collaboration Meeting

  20. Scenario II: Full Forward Spectrometer North Muon Arm 145cm HCAL 80cm HCAL 68cm EMCAL 2T Solenoid EMCAL RICH Preshower 60cm Silicon Tracker VTX + 1 layer IP Silicon Tracker FVTX 1.2 < h < 2.7 8o < q < 37o RHIC Spin Collaboration Meeting

  21. Scenario II: Pros and Cons • Advantages: • Can address all the physics objectives • Will keep the PHENIX spin community interested • Will be able to participate in EIC • EMCal could re-use currently existing PHENIX central arm EMCal • new electronics needed ~2M$ • HCal could try to re-use an HCal from an other experiment or use the same technology as in central detector ~?M$ • RICH • COMPASS or LHC-b design ~4M$ • Additional Tracking: • GEM tracker?  less mass than Si-trackers • Improve STAR design: Cost ~3M$ • Total Cost in the order of 12M$ • Disadvantage: • Relatively high cost RHIC Spin Collaboration Meeting

  22. ep/eA Physics • Lets concentrate on 4GeV lepton energy • electron beam “replaces” yellow hadron beam Proton Energy 50 GeV 100 GeV 250 GeV p/A e- 180o 0o pe: 0-1 GeV pe: 1-2 GeV pe: 3-4 GeV pe: 2-3 GeV 4x50 RHIC Spin Collaboration Meeting

  23. DIS vs. Diffractive (Hadrons) 4x50 4x100 4x250 4x100 4x50 4x250 RHIC Spin Collaboration Meeting E.C. Aschenauer PheniX & STAR meet EIC 23

  24. ? Diffractive Kinematics (p’) t=(p4-p2)2 = 2[(mpin.mpout)-(EinEout - pzinpzout)] 4 x 50 4 x 250 4 x 50 4 x 100 Roman pots required to detected outgoing proton Diffraction: RHIC Spin Collaboration Meeting

  25. Conclusions • The future of RHIC will require a bold effort to directly address fundamental questions in QCD: • Heavy Ions: • Quantitative study of the QGP • Spin: • Separation of Sivers and Collins+Transversity • DY to test modified universality • ep/eA: • Inclusive and diffractive measurements to get us on the road to the full EIC • PHENIX is developing a comprehensive upgrade plan to pursue an exciting, broad physics program over the next decade at RHIC! RHIC Spin Collaboration Meeting

  26. BACKUP RHIC Spin Collaboration Meeting

  27. FOCAL Acceptance •  = 1.2-2.7 (red circle)  = 0.27  (x 2) •  = 1.6-2.7 (blue circle)  = 2 27 RHIC Spin Collaboration Meeting

  28. Counts per 2.5 GeV bin in 50B AuAu Events NLO pQCD (W. Vogelsang) CTEQ6M5, DSS FF pp @ 200 GeV |h|<1.0 q,g jets Direct g Fragmentation g p0(assume RAA = 0.2) p0 Photons Jets RHIC Spin Collaboration Meeting

  29. RHIC-II Luminosity Projections SuperDAQ (i.e. sDAQ) DAQ2010 RHIC II luminosity and new proposed DAQ upgrades can yield 50 billion AuAu event samples (and with great new detector capabilities). RHIC Spin Collaboration Meeting

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