1. Winter Workshop, Trelawny Beach, JamaicaComprehensive RHIC II Detector Relativistic Heavy Ion Collider Facility A Comprehensive New Detector for RHIC II John Harris (Yale) and R. Bellwied (Wayne State), N. Smirnov (Yale), P. Steinberg (BNL), B. Surrow (MIT) and T. Ullrich (BNL)

2. Winter Workshop, Trelawny Beach, JamaicaComprehensive RHIC II Detector PHOBOS BRAHMS Relativistic Heavy Ion Collider Facility RHIC AuAu Design Parameters: Beam Energy = 100 GeV/u No. Bunches = 57 No. Ions /Bunch = 1  10 9 T store = 10 hours L ave = 2  10 26 cm -2 sec -1 RHIC AGS LINAC BOOSTER TANDEMS Pol. Proton Source High Int. Proton Source 9 GeV/u Q = +79 1 MeV/u Q = +32 HEP/NP  g-2 U-line BAF (NASA) STAR PHENIX RHIC II AuAu Parameters: Beam Energy = 100 GeV/u No. Bunches = 112 L ave = 8  10 27 cm -2 sec -1 RHIC II pp Parameters: Beam Energy = 250 GeV/u L ave = 5  10 32 cm -2 sec -1 RHIC pp Design Parameters: Beam Energy = 250 GeV/u L ave = 1.5  10 32 cm -2 sec -1

3. Winter Workshop, Trelawny Beach, JamaicaComprehensive RHIC II Detector Luminosities for AuAu at RHIC & PbPb at LHC  L dt (nb -1 ) RHIC 2x10 26 8x10 26 L (cm -2 s -1 ) RHIC: 14 weeks production/yr, 4 experiments LHC: 4 weeks production/yr, 2-3 experiments Design L by third year LHC 8x10 26 RHIC II: 14 weeks production/yr RHIC II ? 8x10 27  L dt (RHIC II) = 35  L dt (LHC) eRHIC / EIC (?)

4. Winter Workshop, Trelawny Beach, JamaicaComprehensive RHIC II Detector Outline Physics at RHIC in an LHC Era How to Harvest this Physics A New Detector for RHIC II Physics Emphasis Detector Requirements Possible Detector Design Physics Performance

5. Winter Workshop, Trelawny Beach, JamaicaComprehensive RHIC II Detector “Executive” Summary Compelling Physics with RHIC II –Establish the initial conditions at low x (forward rapidities) saturation / color glass condensate –Parton tomography of the QGP (all rapidities) –Melting of the “Onium” States [J/ ,  ’, Y(1s), Y(2s), Y(3s)] –Determination of the structure and dynamics of the proton rare processes: sea polarization, parity-violating processes –Details of QCD – exotic hadrons, glueballs 5-quarks, glueballs, others….. How to Harvest this Physics?  Utilize hard probes with large acceptance in (p T, y) –Jets –High-p T PID particles –  -high-p T correlations –  +  pairs for J/ , Y(1s), Y(2s), Y(3s)

6. Winter Workshop, Trelawny Beach, JamaicaComprehensive RHIC II Detector “Executive” Summary General Detector Requirements – ~4  EM + hadronic calorimetry – high resolution tracking (in large  B  dl ) – PID to p ~ 20-30 GeV/c (flavor tagging) – high rate DAQ and specialized triggering Approach & Possible Solution – Utilize (to extent possible) existing High Energy Magnet/components e.g. SLD, CDF, D0,….. – Build “smart”, fast, state-of-art detector components Satisfies Physics Goals – Details will be presented here

7. Winter Workshop, Trelawny Beach, JamaicaComprehensive RHIC II Detector Predictions from Theory for dAu and pAu Hard Scattering: I. Vitev nucl-th/0302002 v2 Y=0 Y=3 Y= -3 CGC at y=0 Very high energy As y grows Color Glass Condensate D. Kharzeev et al., PR D68:094013,2003

8. Winter Workshop, Trelawny Beach, JamaicaComprehensive RHIC II Detector Nuclear modifications in dAu at  = 3.2! RHI Physics at RHIC (II) in an LHC-era Saturation at low x (10 -3 )? RHIC in unique region! y cm  final state effects forward  initial state HERA  RHIC  LHC  eRHIC BRAHMS, R. Debbe (QM-2004) PRL 91 072305 (2003) LHC ions saturated (y cm )? LHC y cm RHIC y cm RHIC forward

9. Winter Workshop, Trelawny Beach, JamaicaComprehensive RHIC II Detector Measure QGP Properties & Shadowing/Saturation/CGC (low-x forward physics) with Hard Probes – some examples: –Measure modification of FF’s as parton traverses QGP via jets, photons, high-p T identified particles –Measure initial conditions (saturation) vs final state (parton E-loss) effects x-dependence – compare pA, AA, forward- vs mid-rapidities –Determine initial energy of the parton scattering for accurate E-loss via Photon-tag on opposite side (rates are low) –Measure flavor-dependence of jet quenching via  -jet,  -leading hadron, di-hadrons, di-jets (even lower rates) displaced vertices for D- and B-decays (reduced E-loss for heavy quarks) –Measure deconfinement via melting of the Y(1s), Y(2s) and Y(3s) states e and  identification Interesting RHI Physics at RHIC II

10. Winter Workshop, Trelawny Beach, JamaicaComprehensive RHIC II Detector Measure Polarization in Proton and Rare Processes with Hard Probes: –Heavy flavor production (polarized and unpolarized gluon distn’s) –Jet physics (for polarization in proton) –Electro-weak Physics (W+, W- decays for polarization of QCD sea) –Physics beyond the Standard Model (parity-violating interactions) Understanding Details of Strong Interactions (QCD) some examples in pp collisions (possibly AA): –Measure “composite” particle spectrum (pentaquarks, glueballs?) in 1–3 GeV mass range High statistics 2-, 3-, 4-particle correlations with PID in p T range up to 5 GeV/c and forward to large pseudorapidity Missing mass and energy measurements as well as quantum numbers (very forward) –Further search for the H di-baryon Interesting Polarized and Unpolarized pp Physics at RHIC II

11. Winter Workshop, Trelawny Beach, JamaicaComprehensive RHIC II Detector Detailed Study of the QGP and Initial Conditions F QGP (  g QGP ) = f initial (√s, A 1 +A 2, b, x 1, x 2, Q 2 )  f QGP (p T ,y ,  ,p T jet,y jet,  jet,flavor jet,  flow ) Probes –Jets –High p T identified (light-, s-, c-, b-quark) particles –photons –  -jet,  - high-p T identified particle, particle-particle, di-jets Use Hard Probes over Multi-Parameter Space: –Energy - √s –Geometry - system A 1 +A 2, impact parameter b –Rapidity (x-dependence) to forward angles –Transverse momentum of jet / leading particle –Particle type (flavor) –Orientation relative to flow plane (  flow ) –Photon-tag on opposite side

12. Winter Workshop, Trelawny Beach, JamaicaComprehensive RHIC II Detector Detailed “Tomography” of the QGP  /parton parton flow plane F QGP (  g QGP ) = f initial (√s, A 1 +A 2, b, x 1, x 2, Q 2 )  f QGP (p T ,y ,  ,p T jet,y jet,  jet,flavor jet,  flow )

13. Detailed QGP “Tomography”  parton parton  parton parton  parton parton  parton parton , parton parton  parton parton  jet  leading particle (light-, s-, c-, b-quark) jet leading particle (light-, s-, c-, b-quark) leading particle (light-, s-, c-, b-quark)  parton parton

14. Winter Workshop, Trelawny Beach, JamaicaComprehensive RHIC II Detector Modification of Fragmentation Function Induced Gluon Radiation Softens fragmentation Gyulassy et al., nucl-th/0302077

15. Winter Workshop, Trelawny Beach, JamaicaComprehensive RHIC II Detector Flavor-tagged Phenomena Strange and charmed hadron/antihadron asymmetry –Leading particle effect (e.g. E791, hep-ex/0009016) Intra-jet strange hadron production –Difference in gluon and quark jets (e.g. OPAL, hep-ex/9805025) Fragmentation function parametrizations for heavy hadrons –Flavor quenching, dead cone effects (e.g. hep-ph/0106202) Additional production mechanisms for s,c,b hadrons –Recombination or gluon radiation (e.g. nucl-th/0306027) Transverse and longitudinal  polarization –Disappearance in AA (e.g. nucl-th/0110027) General Jet Phenomena Rapidity gaps between jets –Difference between quark and gluon jets (e.g. hep-ph/9911240) Jet like contributions outside the jet cone (pp, pA, AA) –‘pedestal effect’, small vs. large angle gluon radiation (e.g. Stewart, PRD42 (1990) 1385, hep-ph/0303121) Measure Other Modifications in pp vs pA vs AA

16. Winter Workshop, Trelawny Beach, JamaicaComprehensive RHIC II Detector Relativistic Heavy Ions –Jets, high p T leading particles: Excellent  p/p up to p T = 40 GeV/c (y cm ) Electromagnetic / hadronic calorimetry over ~4  phase space Particle identification out to high p T (p ~ 20-30 GeV/c) hadron ( ,K,p) and lepton (e/h,  /h) separation central and forward –Flavor dependence: Precision vertex tracking (displaced vertices c/b-decays) –Onium: Large solid angle coverage for e and  High rate (40kHz) detectors, readout, DAQ, trigger capabilities. Detector Requirements from Physics

17. Winter Workshop, Trelawny Beach, JamaicaComprehensive RHIC II Detector Spin (polarized pp) –Heavy Quark Production (gluon polarization): e ,   detection open beauty production as probe of gluon polarization leading order diagram for heavy quark production in gg-fusion: –QCD (especially jet physics, gluon polarization): jet reconstruction (EM + hadron calorimetry) single-photon detection (  /π o separation), b/c-tagging leading order diagrams for gluon-initiated jets: –Electroweak Physics (QCD sea polarization via W  ): W   e ,   + X requires forward e and  detection, no away-side jet e,  triggers large forward acceptance –Physics beyond the Standard Model (parity violating processes): e and  detection, jet reconstruction, b/c-tagging, missing energy Detector Requirements from Physics II

18. Winter Workshop, Trelawny Beach, JamaicaComprehensive RHIC II Detector Full acceptance in barrel and forward/backward region (0 < |  | < 3-4) –Tracking –High-rate capabilites (pixel, silicon and GEM-type detectors) –Precision inner vertex detector system - secondary vertex reconstruction, momentum resolution –Large  B  dl, B ~ 1.5 T over 2 m. –Particle Identification – , K, p to ~20-30 GeV/c –precision inner vertex detector system - secondary vertex reconstruction, momentum resolution –Electromagnetic and hadronic energy –transverse and longitudinal tower segmentation (for jet reconstruction and electron/hadron separation). Specialized calorimeter / tracking beyond |  |~4 at small x for E missing  system in barrel and forward/backward region for heavy flavors Large  B  dl, B ~ 1.5 T over 2 m. Precise relative luminosity measurement at high-rates Local polarimeter & absolute luminosity measurement High rate DAQ, triggering for rare processes, secondary-vertex trigger Detector Specification

19. Winter Workshop, Trelawny Beach, JamaicaComprehensive RHIC II Detector Re-cycle existing equipment –Utilize detector components from other collider experiments that are decommissioned, or will be in the near future, e.g. SLD, CDF, D0, CLEO –Should be possible to identify and procure existing high field magnet and a large amount of electromagnetic and/or hadronic calorimetry. Build new fast detectors, electronics, DAQ, triggers –New technologies, tracking, PID, electronics, DAQ, triggering Our Approach CDFD0CLEOALEPHSLD Magnet1.4T,SC2.0T,SC1.5T,SC 1.5T-upg-SC R in m1.50.551.452.482.8 L in m4.82.73.57.0 Bdl2.11.02.03.754.2 HCalFe/Sc, 0.78/√E LiquidAr, 0.62/√E NoFET str tube 0.65/√E FET str tube 0.85/√E EMCPb/Sc, 0.13/√E LiquidAr, 0.15/√E CsI crys, 0.03/√E Pb/W, 0.18/√E LiquidAr, 0.15/√E  detector yes Decommis- sioned ? 20092007-092007yes

20. Y X R = 2.8 m SLD magnet, hadronic cal. +  -chambers |  | < 3 (depth = 15 x (5 + 5) cm, r  = 0.3 cm,  z = 3 cm) π/K/p (1-30 GeV/c) PID: Gas RICH (C5F12) with Spherical Mirror Read-out: CsI pads sensitive to UV and MIP AeroGel Cherenkov Detectors with two values of N SC Magnet Coil, 1.5 T EMC: Crystals + Fe(Pb)/Sc (accordion type, projective) or LAr 6x6 mrad towers Additional Tracking: Si Vertex, 4 Pad Detectors in Barrel and End Caps (  -pattern) Si + Pad Detectors Forward dZ = 3.0 m 3-6 layers Si-strip detectors or mini-TPC ToF RPC’s R = 2.8 m A Proof of Principle

21. Comprehensive RHIC II Detector Detector Coverage 1. 2. 3. 4. 5. 6. 7. 8. 9. 10 12. 14. 16 18. p (GeV/c) A1+ToF A1+A2+RICH RICH ToF PID ( , K, p)

22. Winter Workshop, Trelawny Beach, JamaicaComprehensive RHIC II Detector Tracking Detectors under Consideration Tracking Detectors in Barrel Simulation Detector R position half-length Sigma-r  Sigma-Z Thickness (cm) (cm) (cm) (cm) (cm) Vertex detector[1][1] 1. APS 1 2.8 9.6 0.001 0.001 0.02 or 2 4.3 12. Si Pixel 3 6.5 21. 4 10.5 27. Main tracker 2a. Si strip 1 19. 39. 0.003 0.03 0.03 2-sided 2 24.5 42. 3. 31. 45. 4. 38.5 51. 5. 46. 57. 6. 56. 60. or 2b. miniTPC 22.5 – 60. 55. 0.012 0.035 0.2 Mylar + Gas (35 pad rows with 0.2x0.8 pad size) High p T tracker 3. Micro-pattern pad detector 1. 70. 76. 0.17 0.17 0.3 G10 + 2. 115. 110. 0.01 0.9 1.Gas + 3. 135. 130. 0.01 1.2 0.05 Mylar 4. 170. 165. 0.01 1.4 [1][1] Only two vertex detector layers were used in the track reconstruction of this simulation. These were Si pixels of 20  100  m 2 size at 6.5 and 10.5 cm radii.

23. Winter Workshop, Trelawny Beach, JamaicaComprehensive RHIC II Detector Y X R = 2.8 m SLD magnet, hadronic cal. +  -chambers |  | < 3 (depth = 15 x (5 + 5) cm, r  = 0.3 cm,  z = 3 cm) π/K/p (1-30 GeV/c) PID: Gas RICH (C5F12) with Spherical Mirror Read-out: CsI pads sensitive to UV and MIP AeroGel Cherenkov Detectors with two values of N SC Magnet Coil, 1.5 T EMC: Crystals + Fe(Pb)/Sc (accordion type, projective) or LAr 6x6 mrad towers Additional Tracking: Si Vertex, 4 Pad Detectors in Barrel and End Caps (  -pattern) Si + Pad Detectors Forward dZ = 3.0 m 3-6 layers Si-strip detectors or mini-TPC ToF RPC’s R = 2.8 m Tracking

24. Winter Workshop, Trelawny Beach, JamaicaComprehensive RHIC II Detector Momentum Resolution dPt/Pt, % Pt, GeV/c dPt/Pt, % Pt, GeV/c IηI < 0.8 0.8<IηI < 1.6 IηI > 2.2 IηIIηI Pt = 10. GeV/c Pt = 2. GeV/c 5. 10. 20. 30. 2. 4. 8. 12. 10 1 1 40 1 2 3 Pad detectors only all tracking detectors

25. Winter Workshop, Trelawny Beach, JamaicaComprehensive RHIC II Detector Detector parameters to consider: –Particle identification (PID) reach in momentum –Pseudo-rapidity coverage –Detector resolutions: momentum, energy, two-track –Data acquisition (DAQ) rate A new comprehensive detector would be superior to: –Upgraded STAR in terms of resolution, PID, coverage (inc. calorimetry), rate –Upgraded PHENIX in terms of PID, coverage (inc. calorimetry) –ALICE in terms of PID, coverage, resolution, statistics/operation (pp, pA?, AA) –CMS in terms of PID, statistics/operation (pp, pA?, AA) Detector Parameter Considerations for Detector Comparisons

26. Winter Workshop, Trelawny Beach, JamaicaComprehensive RHIC II Detector Fast tracking detectors complement fast PID, calorimetry –40x improvement in DAQ rate compared to STAR High resolution EM calorimeter and  chambers –allows resolution of all Y states Near 4  coverage in tracking, PID, calorimetry –20x improvement in heavy quark probes compared to PHENIX (> 20,000 Y per RHIC year, and still > 3000 Y(3s)) PID out to 20-30 GeV/c over ~4  with high two-track resolution tracking –Measure actual jet physics rather than leading particle physics Particle identify all particles in jet Measure intra-jet correlations between identified hadrons in jet –Direct heavy flavor tagging of jets via leading particle reconstruction  -jet measurements with away-side spectrum out to 20 GeV/c (20 weeks at 40L o ) –p T = 10 GeV/c2.6 M events - p T = 15 GeV/c260 K events –p T = 20 GeV/c30 K events Various Aspects of Detector  Extend the Physics Reach

27. Winter Workshop, Trelawny Beach, JamaicaComprehensive RHIC II Detector Lattice QCD Calculations / Schematic Onium Melting q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q F. Karsch, hep-ph/0103314 T C ~ 175 MeV   C ~ 1 GeV/fm 3  ~ 2 GeV/fm 3  15 GeV/fm 3  50 GeV/fm 3 ,  ’,  c, Y(3s) melts J/ YY (2s) melts Y(1s) melts

28. Winter Workshop, Trelawny Beach, JamaicaComprehensive RHIC II Detector Charmonium Mass Reconstruction and Rate   e+e- (1S) (2S) full scale simulation / reconstruction (3S) RHIC II –assume  Ldt = 10 nb -1 –4 weeks run –from PYTHIA in |  | < 2.5 Y  e + e - –Y(1s) = 19,100 –Y(2s) = 3,200 –Y(3s) = 3,200 Y   +  - –same as above

29. Winter Workshop, Trelawny Beach, JamaicaComprehensive RHIC II Detector Unique physics at RHIC II with LHC running –Detailed QGP tomography, onium, saturation / CGC, spin physics –Other? - must still develop this case! Comprehensive new detector system can harvest this physics –Proof of principle –Maximize physics output from RHIC II – must still develop this case! Detailed simulations to optimize detector configuration –continuing! Interest in community (to be developed!) –Next generation of RHI physics in U.S. –More theoretical input / guidance –Experimental interest? –Comments Summary “Statement of Interest” document and Presentation at RHIC Planning Meeting on web at http://star.physics.yale.edu/users/harris/ R. Bellwied, J.W. Harris, N. Smirnov, P. Steinberg, B. Surrow, T. Ullrich

30. RHIC Planning Meeting – BNL 4 Dec 2003 Comprehensive RHIC II Detector Ideas for a Comprehensive New Detector for In-Depth Study of the QGP, Initial Conditions and Spin Physics at RHIC II R. Bellwied, J.W. Harris, N. Smirnov, P. Steinberg, B. Surrow, and T. Ullrich Statement of Interest document at http://star.physics.yale.edu/users/harris/