1. Spin Physics at RHIC Abhay Deshpande RIKEN BNL Research Center QCD 2002 Indian Institute of Technology, Kanpur

2. November 19, 2002Spin Physcis at RHIC2 Overview NUCLEON SPIN Present status and open questions RHIC SPIN (Present: RECENT RESULTS) Relativistic Heavy Ion Collider at BNL Status of polarized proton Collider (Year 2001-2002) -- Expectation for Year 2002-2003 Polarized p-p physics at RHIC results FY02 -- Expectations FY03 Long term perspective for RHIC Spin (pp) Electron Ion Collider at RHIC (Future) Electron ring at RHIC Physics goals of EIC (… mostly e-p… but also e-A) Status & Plans

3. November 19, 2002Spin Physcis at RHIC3 Parton Distributions Nucleon (well known) (moderately well known) (unknown) (moderately well known) (unknown)

4. November 19, 2002Spin Physcis at RHIC4 Our knowledge of spin structure function F2F2 g1g1 Q 2 (GeV 2 ) 10 5 10 10 2 1 1010 3

5. November 19, 2002Spin Physcis at RHIC5 Nucleon Spin: Status & Open Questions Proton Spin Puzzle remains unsolved! constrained, need to measure SMC, B. Adeva et al. Phys. Rev. D 112002 (1999) Gluon Spin Contribution: Quark Spin Contribution:

6. November 19, 2002Spin Physcis at RHIC6 Relativistic Heavy Ion Collider this is test RHIC accelerates heavy ion beams up to and polarized proton beams to 250 GeV Two large detectors PHENIX and STAR have extensive Spin Physics Programs PHENIX STAR

7. November 19, 2002Spin Physcis at RHIC7 RHIC Accelerator Complex BRAHMS & PP2PP (p) STAR (p) PHENIX (p) AGS LINAC BOOSTER Pol. Proton Source 500  A, 300  s Spin Rotators Partial Siberian Snake Siberian Snakes 200 MeV Polarimeter AGS Internal Polarimeter Rf Dipoles RHIC pC Polarimeters Absolute Polarimeter (H jet) 2  10 11 Pol. Protons / Bunch  = 20  mm mrad

8. November 19, 2002Spin Physcis at RHIC8 RHIC Polarimetry Beam ’ s View Si #1 Si #2 Si #4 Si #3 leftright down up Si #5 Si #6 Carbon filament target (5mg/cm 2 ) in the RHIC beam Measure recoil carbon ions at q~90 º 100 keV < E carbon < 1 MeV Wave-Form Digitizer +FPGA high counting rates (~0.5 MHz) scaler measurement   A ~ 3  10 -4 in ~1 minute. Carbon ADC values Arrival time (ns)

9. November 19, 2002Spin Physcis at RHIC9 Siberian Snakes STAR PHENIX AGS LINAC RHIC Effect of depolarizing resonances averaged out by rotating spin by large angles on each turn 4 helical dipoles  S. snake 2 snakes in each ring -- axes orthogonal to each other

10. November 19, 2002Spin Physcis at RHIC10 Successful Operation of the Snake Injection with Spin Flipped: Asymmetry Flipped Adiabatically Snake on: Horizontal polarization Accelerate equivalent to 180 o rotation: 180 o rotated Successful Single Snake Operation !

11. November 19, 2002Spin Physcis at RHIC11 Cheers!

12. November 19, 2002Spin Physcis at RHIC12 RHIC Luminosity FY02 PHENIX 150 nb -1 0 50 100 150 200 250 300 350 13579111315171921232527293133 Days into run (from 12/20/01) STAR 300 nb -1 Machine Luminosity 300 nb -1 /week Peak 1.8x10 30 cm -2 s -1

13. November 19, 2002Spin Physcis at RHIC13 Polarization Year 1 Yellow RingBlue Ring

14. November 19, 2002Spin Physcis at RHIC14 Why low polarization? 10% 20% 30% P AGS P RHIC Source Improvement AGS power generator failure ½ ramp up speed 2x resonance effect New AGS SNAKE 2004-5 Ramp up Spead Injection 1 st Year

15. November 19, 2002Spin Physcis at RHIC15 Machine Performance Expectations RUN#proton/ bunch [x10 9 ] #bunchBeta* (m) Emittanc e (  m) L uminosity 10 30 cm -2 s -1 Pol. (%) 2001- 2002 70553251.815-25 2002- 2003 1001121251645-55 2005-?1121??70-80 Design2001121208070

16. November 19, 2002Spin Physcis at RHIC16 RHIC Spin Physics Program Spin Structure of Nucleon –1/2=(1/2)  +  G+L q +L g  G: gluon polarization  q: Anti-quark polarization –New Structure Functions h 1 : transversity NEW tool to study hadronic processes W,Z @500GeV flavor sensitive studies on the structure functions cc/bb Production mechanism Spin in fragmentation Parity,CP violating interaction? Test of pQCD Use asymmetries sensitive ONLY to the higher orders (A N at high P T etc.) ?QCD triumph? or ?beyond ?

17. November 19, 2002Spin Physcis at RHIC17 RHIC spin program Production Heavy Flavors Direct Photon Jet Photon STAR + PHENIX W Production STAR +PHENIX BRAHMS, STAR, PHENIX, Local Polarimeter

18. November 19, 2002Spin Physcis at RHIC18 PHENIX Detector EMCal Resolution Background/Signal Muon ID Panels Central Arms North Muon Arm South Muon Arm Ring Imaging Cerenkov EM Calorimeter Muon Tracking Chambers Beam-Beam Counter Multiplicity/Vertex Detector Time Expansion Chamber Drift Chambers Pad Chambers Time of Flight Panels

19. November 19, 2002Spin Physcis at RHIC19 PHENIX Preliminary Normalization error of 30% not shown. On the way to  G…  0 spectrum PT spectrum over 8 order of magnitude Comparision with NLO pQCD calculation --CTEQ5M PDFs --Potter, Knielh, Kramer (PKK) fragmentation functions --Uncertainty shown:  = p T /2, 2p T Consistent with data within scale dependence PHENIX  0 cross section (Preliminary)

20. November 19, 2002Spin Physcis at RHIC20 PHENIX Preliminary µ+µ-µ+µ- e+e-e+e- Br(J/  l + l - )  (total) = 226  36 (stat.)  79 (syst.) nb  ( p+p  J/  X ) = 3.8  0.6 (stat.)  1.3 (syst.) µb Total Cross section vs. the Color-Evaporation Model prediction CEM Parameters are fixed by fitting low energy data The result agrees with the CEM prediction at  s=200GeV Rapidity distribution compared with PHITHIA simulation

21. November 19, 2002Spin Physcis at RHIC21 STAR Performance Time Projection Chamber worked beautifully! Au-Au Collision at STAR

22. November 19, 2002Spin Physcis at RHIC22 Single spin asymmetries: L-R Essential for proton spin orientation information at IPs 0 1 2 3 4 5 Rapidity STAR FPD 0 o CAL BBC PHENIX MUON PHENIX CENTRAL STAR TPC pp2pp E704 at Fermilab at  s=20 GeV, p T =0.5-2.0 GeV/c: X F 0.2 0.4 0.6 0.8 PTPT Possible Origins: Transversity, Higher Twist, Fragmentation, k T, Orbital. Etc.

23. November 19, 2002Spin Physcis at RHIC23 STAR Forward rapidity high x F  0 A N x F ~ E / 100 GeV STAR FPD Preliminary Data Assuming A N (CNI)= 0.013 p T =1.1 - 2.5 GeV/c 0.0 0.2 0.4 -0.2 00.20.40.60.81.0 A N    Systematic uncertainty + － 0.05 Theory predictions at p T = 1.5 GeV/c Collins effect Anselmino, et al. PRD 60 (1999) 054027. Sivers effect Anselmino, et al. Phys. Lett. B442 (1998) 470. Twist 3 effect Qiu and Sterman, Phys. Rev. D59 (1998) 014004. Y.Koike PaNic02

24. November 19, 2002Spin Physcis at RHIC24 12 o’clock  PHENIX test setup Hadron Cal Base Pb Scintillator W+Fiber Cal Post-shower EM Cal Base PbWO 4 Charge Veto Neutron Veto 00

25. November 19, 2002Spin Physcis at RHIC25 Asymmetries EMCal ZDC

26. November 19, 2002Spin Physcis at RHIC26 Asymmetries seen at RHIC so far… 0 1 2 3 4 5 Rapidity STAR FPD 0 o CAL BBC PHENIX MUON PHENIX CENTRAL STAR TPC pp2pp X F 0.2 0.4 0.6 0.8 PTPT  0 +10 ~ +20% Charged +1% Neutron - 10%  ~0 %  0 ~0%

27. November 19, 2002Spin Physcis at RHIC27 Upcoming Run FY03 3 pb -1 and 50% Expectation  G will be probed STAR JET PHENIX Charged

28. November 19, 2002Spin Physcis at RHIC28 Search for new physics: Anomalous parity violation in jet production –Contact Interaction (Scale  ) CDF  >1.8 TeV D0  >2.4 TeV RHIC Spin Reach  ~3.3 TeV –New gauge boson Z’ P. Taxil & J-M. Virey, Phys. Rev. D (55) 2457 (1999)

29. November 19, 2002Spin Physcis at RHIC29 RHIC Spin Schedule (PHENIX & STAR) YearCM EnergyWeeksInt. Lum.Remarks FY2002200 GeV55 pb -1 (1/15) Gluon pol. with pions FY2003200 GeV8(3)160 pb -1 Gluon pol. with jets 500 GeV2(0)?90 pb -1 PV W production, u-quark pol. 500 GeV (1) Machine Studies, identify Ws. FY2004200 GeV8160 pb -1 Gluon pol. with g + jet/ TT 500 GeV2120 pb -1 First ubar,dbar pol. meas.. FY2005500 GeV8480 pb -1 Gluon pol. with g+jet, g,jet+jet, heavy flavor, ubar, dbar pol. 200 GeV248 pb -1 Gluon pol. with g, g+jet, heavy flavor/TT FY2006500 GeV5300 pb -1 More statistics 200 GeV5120 pb -1 FY2007200 GeV10210 pb -1

30. November 19, 2002Spin Physcis at RHIC30 Summary & Outlook RHIC spin program has begun: -- Polarized protons were injected and stored for extended times in RHIC -- CNI polarimeters have measured non zero asymmetries indicating polarization at 100 GeV proton beam energies -- Detectors are functional and will be 100% completed in 2004-5 -- A first round of single spin asymmetries have been measured Next run 2002-3 promises to be the first one to get us a first look at  G -- First trials of 500 GeV run will be made and Ws produced A 5 year run plan exists for the RHIC spin physics -- to explore  G, transversity,  q &  qbar is on the way

31. November 19, 2002Spin Physcis at RHIC31 The Electron Ion Collider A high energy, high intensity polarized electron beam facility at BNL to collide with the existing RHIC heavy ion and polarized proton beam would significantly enhance RHIC’s ability to probe fundamental and universal aspects of QCD

32. November 19, 2002Spin Physcis at RHIC32 Deep Inelastic Scattering Observe scattered electron/muon & hadrons in current jets Observe spectator or remnant jet

33. November 19, 2002Spin Physcis at RHIC33 Why Collider in the Future? Past polarized DIS experiments: MOSTLY FIXED TARGET Collider has distinct advantages --- Confirmed at HERA Better angular separation between scattered lepton & nuclear fragments  Better resolution of electromagnetic probe  Recognition of rapidity gap events (recent diffractive physics) Better measurement of nuclear fragments Higher center of mass (CoM) energies reachable Tricky integration of beam pipe – interaction region -- detector

34. November 19, 2002Spin Physcis at RHIC34 EIC vs. DIS Facilities (I) New kinematic region E e = 2-10 GeV E p = 30 – 250 GeV Sqrt(s) = 20 – 100 GeV Kinematic reach of EIC x = 10 -4  0.6 Q 2 = 0  10 4 GeV High Luminosity L= (0.3 – 1.0) X 10 33 cm -2 sec -1

35. November 19, 2002Spin Physcis at RHIC35 EIC vs. Other DIS Facilities (II) Variable beam energy Variable hadron species Hadron beam polarization Large luminosity TESLA-N

36. November 19, 2002Spin Physcis at RHIC36 Scientific Frontiers Open to EIC Nucleon Structure: polarized & unpolarized e-p/n scattering -- Role of quarks and gluons in the nucleon -- Spin structure: polarized quark & gluon distributions -- Unpolarized quark & gluon distributions -- Correlation between partons  hard exclusive processes leading to Generalized Parton Distributions (GPD’s) Nuclear structure: unpolarized e-A scattering -- Role of quarks and gluons in nuclei -- e-p vs. e-A physics in comparison Hadronization in nucleons and nuclei & effect of nuclear media -- How do partons knocked out of nucleon in DIS evolve in to colorless hadrons? Partonic matter under extreme conditions -- e-A vs. e-p scattering; study as a function of A

37. November 19, 2002Spin Physcis at RHIC37 Unpolarized DIS e-p at EIC Large(r) kinematic region already covered at HERA but additional studies at EIC are possible & desirable Uniqueness of EIC: high luminosity, variable Sqrt(s), He3 beam, improved detector & interaction region Will enable precision physics: -- He3 beams  neutron structure  d/u as x  0, dbar(x)-ubar(x) -- precision measurement of  S (Q 2 ) -- flavor separation (charm and strangeness) -- precision gluon distribution in x=0.001 to x=0.6 -- slopes in dF 2 /dlnQ 2 -- precision photoproduction physics -- exclusive reaction measurements -- nuclear fragmentation region measurements

38. November 19, 2002Spin Physcis at RHIC38 Polarized DIS at EIC Spin structure functions g 1 (p,n) at low x, high precision -- g 1 (p-n): Bjorken Spin sum rule better than 1% accuracy Polarized gluon distribution function  G(x,Q 2 ) -- at least three different experimental methods Precision measurement of  S (Q2) from g 1 scaling violations Polarized structure function of the photon from photo- production Electroweak structure function g 5 via W +/- production Flavor separation of PDFs through semi-inclusive DIS Deeply Virtual Compton Scattering (DVCS)  Gerneralized Parton Distributions (GPDs) Transversity Drell-Hern-Gerasimov spin sum rule test at high Target/Current fragmentation studies … etc….

39. November 19, 2002Spin Physcis at RHIC39 Spin structure function g 1 at low x ~5-7 days of data 3 years of data A. Deshpande & V. W. Hughes Studies included statistical error & detector smearing to confirm that asymmetries are measurable. No present or future approved experiment will be able to make this measurement

40. November 19, 2002Spin Physcis at RHIC40 Low x measurement of g 1 of Neutron With polarized He3 or deuteron ~ 2 weeks of data at EIC Compared with SMC(past) & possible HERA data If combined with g1 of proton results in Bjorken sum rule test of better than 1% within a couple of months of running (G.Igo & T. Sloan, AD & V. Hughes) EIC 1 inv.fb A. Deshpande & V. W. Hughes

41. November 19, 2002Spin Physcis at RHIC41 Polarized Gluon Measurement at EIC This is the hottest of the experimental measurements being pursued at various experimental facilities: -- HERMES/DESY, COMPASS/CERN, RHIC-Spin/BNL & E159/E160 at SLAC Measurements at EIC will be complimentary with RHIC with a very different set of systematic uncertainties - high Q 2 assures no problems with interpretation of results Deep Inelastic Scattering kinematics at EIC -- Scaling violations (pQCD analysis at NLO) of g 1 -- (2+1) jet production in photon-gluon-fusion process -- 2-high pT hadro production in PGF Photo-production (real photon) kinematics at EIC -- Single and di-jet production in PGF -- Open charm production in PGF

42. November 19, 2002Spin Physcis at RHIC42  G from Scaling Violations of g 1 World data (today) allows a NLO pQCD fit to the scaling violations in g 1 resulting in the polarized gluon distribution and its first moment. SM collaboration, B. Adeva et al. PRD (1998) 112002  G = 1.0 +/- 1.0 (stat) +/- 0.4 (exp. Syst.) +/- 1.4 (theory) Theory uncertainty dominated by the lack of knowledge of the shape of the PDFs in unmeasured low x region where EIC data will play a crucial role. With approx. 1 week of EIC data, statistical and theoretical uncertainties on  G will be reduced by a factor of 3 -- coupled to better low x knowledge of spin structure -- less dependence on factorization & re-normalization scale uncertainty A. Deshpande, V. W. Hughes & J. Lichtenstadt

43. November 19, 2002Spin Physcis at RHIC43 Photon Gluon Fusion at EIC “Direct” determination of  G -- Di-Jet events -- High p T leading hadrons High Sqrt(s) at EIC -- no theoretical ambiguities Both methods tried at HERA for un-polarized gluon determination & both are successful! -- NLO calculations exist -- H1 and ZEUS results -- Consistent with scaling violation F 2 results on G Signal: PGF Background QCD Compton

44. November 19, 2002Spin Physcis at RHIC44 Di-Jet events at EIC: Analysis at NLO Stat. Accuracy for two luminosities Detector smearing effects considered NLO analysis G. Radel, A. De Roeck, A. Deshpande, V. W. Hughes & J. Lichtenstadt Easy to differentiate different  G scenarios: factor 3 improvements in ~2 weeks If combined with scaling violations of g 1 : factors of 5 improvements in uncertainties observed in the same time. Better than 3-5% uncertainty can be expected from EIC  G program

45. November 19, 2002Spin Physcis at RHIC45 Di-Jet at EIC vs. World Data for  G/G Good precision Clean measurement in x range 0.01< x < 0.3 Constrains shape of  G(x) Polarization in HERA much more difficult than RHIC. G. Radel & A. De Roeck EIC Di-Jet DATA 2fb -1

46. November 19, 2002Spin Physcis at RHIC46 Polarized PDFs of the Photons Photo-production studies with single and di-jet Photon Gluon Fusion or Gluon Gluon Fusion (Photon resolves in to its partonic contents) Resolved photon asymmetries result in measurements of spin structure of the photon Asymmetries sensitive to gluon polarization as well… but we will consider the gluon polarization “a known” quantity! Direct PhotonResolved Photon

47. November 19, 2002Spin Physcis at RHIC47 Will measure the photon PDFs… Stat. Accuracy estimated for 1 fb -1 running (2 weeks at EIC) Single and double jet asymmetries ZEUS acceptance Will resolve photon’s partonic spin contents Direct Photon Resolved Photon M. Stratmann & W. Vogelsang

48. November 19, 2002Spin Physcis at RHIC48 Parity Violating Structure Function g 5 This is also a test For EIC kinematics Experimental signature is a huge asymmetry in detector (neutrino) Unique measurement Unpolarized xF 3 measurements at HERA in progress Will access heavy quark distribution in polarized DIS

49. November 19, 2002Spin Physcis at RHIC49 Measurement Accuracy PV g 5 at EIC Assumes: 1.Input GS Pol. PDfs 2.xF 3 measured by then 3.4 fb -1 luminosity Positrons & Electrons in EIC  g 5 (+) >> Issues for linac vs. ring design of EIC J. Contreras & A. De Roeck

50. November 19, 2002Spin Physcis at RHIC50 Drell Hern Gerasimov Spin Sum Rule DHG Sum rule: At EIC n range: GeV  few TeV Although contribution from to the this sum rule is small, the high n behavior is completely unknown and hence theoretically biased in any present measurements at: Jefferson Lab., MAMI, BNL S. Bass, A. De Roeck & A. Deshpande Inclusive Photo-production measurement Using electron tagger in RHIC ring Q 2 ~ 10 -6  10 -2 GeV 2 Sqrt(s) ~ 25  85 GeV

51. November 19, 2002Spin Physcis at RHIC51 DVCS/Vector Meson Production Hard Exclusive DIS process  (default) but also vector mesons possible Remove a parton & put another back in!  Microsurgery of Baryons! Claim: Possible access to skewed or off forward PDFs? Polarized structure: Access to quark orbital angular momentum? On going theoretical debate… experimental effort just beginning…

52. November 19, 2002Spin Physcis at RHIC52 Strange Quark Distributions at EIC After measuring u & d quark polarized distributions…. Turn to s quark (polarized & otherwise) Detector with good Particle ID: pion/kaon separation Upper Left: statistical errors for kaon related asymmetries shown with A 1 inclusive Left: Accuracy of strange quark distribution function measurements possible with EIC and HERMES (2003-05) and some theoretical curves on expectations. E. Kinney & U. Stoesslein

53. November 19, 2002Spin Physcis at RHIC53 Highlights of e-A Physics at EIC Study of e-A physics in Collider mode for the first time QCD in a different environment Clarify & reinforce physics studied so far in fixed target e-A &  -A experiments including target fragmentation QCD in: x > [1/(2m N R N ) ] ~ 0.1 (high x) QCD in: [1/(2m N R A )] < x < [1/(2m N R N )] ~ 0.1 (medium x) …. And extend in to a very low x region to explore: saturation effects or high density partonic matter also called the Color Glass Condensate (CGC) QCD in: x < [1/(2m N R A )] ~ 0.01 (low x)

54. November 19, 2002Spin Physcis at RHIC54 DIS in Nuclei is Different! Regions of: Fermi smearing EMC effect Enhancement Shadowing Saturation? Regions of shadowing and saturation mostly around Q 2 ~1 GeV 2 An e-A collision at EIC can be at significantly higher Q 2 F 2 D/F 2 A Low Q 2 ! E665, NMC, SLAC Experiments

55. November 19, 2002Spin Physcis at RHIC55 Statistical Precision at EIC for e-A High precision at EIC shown statistical errors for 1 pb -1 Recall: EIC will deliver ~85 pb -1 per day NMC data F 2 (Sn/D) EIC’s Q 2 range between 1 and 10 GeV 2 Will explore saturation region! T. Sloan

56. November 19, 2002Spin Physcis at RHIC56 A Case for EIC (I) Through its large luminosity, beam energy & beam species variability, the EIC will explore a new universal and fundamental aspects of QCD It is natural to assume that these measurements probe the initial conditions in the nuclei for parton distributions… as such this knowledge would be essential to fully understand the QGP which is being pursued at RHIC The e-A physics at RHIC will allow for the first time a large number of measurements which have never been performed beyond the fixed target regime… They will be at high energies where pQCD could be used reliably to understand the nuclear structure

57. November 19, 2002Spin Physcis at RHIC57 A Case for EIC (II) The polarized e-N facility at the EIC will enable the polarized DIS studies of nucleons in a completely new x-Q 2 that no other present or future facility will be able to access The variety of measurements at low Sqrt(s) will also include: -- inclusive physics in DIS as well as photoproduction regime -- semi-inclusive physics -- exclusive physics leading to DVCS, DES  GPDs In addition a lot of spin measurements which would clearly study target and current fragmentation for the first time in polarized DIS will be possible with EIC

58. November 19, 2002Spin Physcis at RHIC58 Moving Towards EIC…. September 2001: EIC grew out of joining of two communities: 1) polarized eRHIC (ep and eA at RHIC) BNL, UCLA, YALE and people from DESY & CERN 2) Electron Poliarized Ion Collider (EPIC) 3-5 GeV e X 30-50 GeV polarized light ions Colorado, IUCF, MIT/Bates, HERMES collaborators February 2002: White paper submitted to NSAC Long Range Planning Review  Received enthusiastic support as a next R&D project (see: US/DoE Nuclear Report on the Web) Steering Committee: 7 members, one each from BNL, IUCF, LANL, LBL, MIT, UIUC, Yale + Contact person (AD) ~20 (~13 US + ~7 non-US) Institutes, ~100 physicists + ~40 accelerator physicists See for more details: EIC Web-page at “http://www.bnl.gov/eic” Subgroups: Accelerator WG, Physics WG, Detector WG

59. November 19, 2002Spin Physcis at RHIC59 Present Collider Layout Proposed by BINP & MIT/Bates E-ring is ¼ of RHIC ring Collisions in ONE interaction region Collision energies 5-10 GeV Injection linac 2-5 GeV Lattice based on “superbend” magnets Self polarization using Sokolov Ternov Effect: (14-16 min pol. Time) IP12, IP2 and IP4 are possible candidates for collision points p e 2GeV (5GeV) 2-10 GeV IP12 IP2 IP4 IP6 IP8 IP10 RHIC OTHER : Ring with 6 IPS, Linac-Ring, Linac-Re-circulating ring

60. November 19, 2002Spin Physcis at RHIC60 Interaction Region Design…. B. Parker’s (BNL) Proposal Budker/MIT Proposal

61. November 19, 2002Spin Physcis at RHIC61 A Detector for EIC  A 4  Detector Scattered electrons to measure kinematics of DIS Scattered electrons at small (~zero degrees) to tag photo production Central hadronic final state for kinematics, jet measurements, quark flavor tagging, fragmentation studies, particle ID Central hard photon and particle/vector detection (DVCS) ~Zero angle photon measurement to control radiative corrections and in e-A physics to tag nuclear de-excitations Missing E T for neutrino final states (W decays) Forward tagging for 1) nuclear fragments, 2) diffractive physics EIC will provide: 1) Variable beam energies 2) different hadronic species, some of them polarization, 3) high luminosity

62. November 19, 2002Spin Physcis at RHIC62 Detector Design (I)… others expected J. Chwastowski & W. Krasny

63. November 19, 2002Spin Physcis at RHIC63 Detector Design (I)… others expected J. Chwastowski & W. Krasny

64. November 19, 2002Spin Physcis at RHIC64 A time line for EIC… “Predictions are very difficult to make, especially when they are about the future” --- A very wise man…. Proposal/CDR0 by 2004-2005 Expected formal approval 2005-6 Long Range Review R&D money could start for hardware 2007 Construction of IR and Detector begin 2007-2008 3-5 years for staged detector and IR construction without interfering with the RHIC running First collisions (2011)??? If any one knows how to do this earlier… -- I am listening.