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Contents Status of Spin Collider Physics of Spin Collider First Results, Highlights

Physics with RHIC Spin Collider ---- just taking off ----- Hideto En’yo RIKEN / RIKEN-BNL Research Center. Contents Status of Spin Collider Physics of Spin Collider First Results, Highlights Summery & Outlook. Two Rings in the Tunnel. KEK OPPPS, Tuned for RHIC at TRIUMPH

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Contents Status of Spin Collider Physics of Spin Collider First Results, Highlights

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  1. Physics with RHIC Spin Collider---- just taking off -----Hideto En’yo RIKEN / RIKEN-BNL Research Center Contents • Status of Spin Collider • Physics of Spin Collider • First Results, Highlights • Summery & Outlook PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

  2. Two Rings in the Tunnel KEK OPPPS, Tuned for RHIC at TRIUMPH 500 mA, 300 ms AGS: Partial Siberian Snake Booster: No Spin Resonance Transfer Lines to RHIC, Spin transparent Polarized Proton Acceleration PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

  3. RHIC PHENIX STAR LINAC AGS Snake Magnet Proton and its spin motion in Snake 4 Helical Dipoles – one Snake essential invention for RHIC spin 2 Snakes in each ring Snake axis orthogonal each other Spin is preserved up to 250GeV RIKEN fund PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

  4. PaNic02 K.Kurita Carbon filament target (5mg/cm2)in the RHIC beam Measure recoil carbon ions at q~90º 100 keV < Ecarbon< 1 MeV up Si #6 Arrival time (ns) Si #1 Carbon left right RHIC Si #5 Si #2 Wave-Form Digitizer +FPGA high counting rates (~0.5 MHz) scaler measurement  de ~ 310-4 in ~1 minute. PHENIX Si #3 STAR Si #4 down ADC values Beam’s View LINAC AGS Coulomb Nuclear Interference Polarimeter PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

  5. PHENIX 150 nb-1 Luminosity in Year 1 Machine Luminosity 300 nb-1 /week Peak 1.8x1030 cm-2s-1 350 300 250 STAR 300 nb-1 200 150 100 50 0 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 Days into run (from 12/20/01) PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

  6. Polarization in Year 1 Yellow Ring Blue Ring PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

  7. PRHIC 10% 20% 30% PAGS Why polarization was low ? Source Improvement New AGS SNAKE 2004-5 Ramp up Spead Injection 1st Year AGS motor generator failure ½ ramp up speed 2x resonance effect PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

  8. Prospect of Machine performance PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

  9. pp2pp RHIC Spin Rotators PHENIX STAR LINAC AGS The Spin Experiments pp elastic Silicons in Roman pot -t down (0.004 GeV/c)2 b*=10m (special tune) PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

  10. Spin Physics at RHIC RHIC = polarized parton collider • Spin Structure of Nucleon • 1/2=(1/2)DS+DG+Lq+Lg • DG: gluon polarization • Dq: Anti-quark polarization • New Structures • h1: transversity • NEW TOOL to study hadronic processes • W,Z @500GeV • flavor sensitive studies on the structure functions • cc/bb • Production mechanism • Spin in the fragmentation • Parity,CP violating interaction? • Test of pQCD • Use asymmetries sensitive ONLY to the higher orders (AN at high PT etc.) ?QCD triumph? or ?beyond ? PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

  11. Asymmetries Measurements • ALL:Double Longitudinal Spin Asymmetry • Useful in extracting quark/gluon helicity distributions AN:Twist-3 or T ATT: Transversity AL:Parity Violation PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

  12. Impact of RHIC Spin on Dg Global QCD Analysis With RHIC DATA (1year) AAC Preliminary AAC Preliminary M. Hirai, H.Kobayashi, M. Miyama et al. PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

  13. N.Saito Measurements of Dq, Dq at PHENIX Parity violating single Asymmetry unpolarized distribution  polarized distribution • d small at high x Du/u (Dd/d for W-) flavor selected valence quark polarization • Dd/d (Du/u for W-) determination Major background is Z decay (20%) systematic error will be minimized (~1%) with ALZ (~20%)and s(Z) measurements PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

  14. Data from the 1st polarized pp runs Run all the time with vertical polarization polarization is too low to perform double spin No gluon information Commission the detectors for polarized pp Cross section reference for pp and AA First measurements of L-R asymmetry at root s = 200GeV PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

  15. Spin02 B.Fox (RBRC) QM02 H,Torii(Kyoto) PaNic02 Y. Goto(RIKEN) PHENIX Preliminary Normalization error of 30% not shown. PHENEIXp0 cross section • Pt Spectrum over 108 magnitude • NLO pQCD calculation • CTEQ5M pdf • Potter-Kniehl-Kramer(PKK) • fragmentation function •  = pT/2, pT, 2pT • Consistent with data within the scale dependence. pT dependent systematic error MB trigger 2x2 trigger PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

  16. Spin02 H. Sato( Kyoto) Panic02 K.Ozawa(CNS) PHENIX J/ Rapidity distribution compared with PHITHIA simulation Total Cross section vs. the Color-Evaporation Model prediction e+e- µ+µ- Br(J/l+l-) (total) = 226  36 (stat.)  79 (syst.) nb  (p+pJ/X) = 3.8  0.6 (stat.)  1.3 (syst.) µb • CEM Parameters are fixed by fitting low energy data • The result agrees with the CEM prediction at s=200GeV PHENIX Preliminary PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

  17. Physics in AN (L-R Asymmetry)useful for local polarimeter for collision point E704 at Fermilab at s=20 GeV, pT=0.5-2.0 GeV/c: PT XF 0.2 0.4 0.6 0.8 STAR TPC PHENIX MUON PHENIX CENTRAL STAR FPD BBC pp2pp 0o CAL 0 1 2 3 4 5 Rapidity Models:: Transversity, Higher Twist, Fragmentation, kT, Orbital. Etc. PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

  18. Spin02 G.Rakness(IUCF) STAR Forward rapidity high xF p0 AN AN Theory predictions at pT = 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 effectQiu and Sterman, Phys. Rev. D59 (1998) 014004. Y.Koike PaNic02 0.4 STAR FPD Preliminary Data Assuming AN(CNI)= 0.013 pT=1.1 - 2.5 GeV/c 0.2 0.0 Systematic uncertainty +－ 0.05 0 0.2 0.4 0.6 0.8 1.0 -0.2 xF ~E / 100 GeV PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

  19. Beam-Beam Counter (BBC) Luminosity Monitor of STAR Scintillator annulus installed around the beam pipe, on the east and west poletips of STAR magnet at ±3.5m from IR ( 2 < |h| < 5) beam pipe ~7m STAR Magnet + TPC FPD BBC (East) BBC (West) Schematic side view of STAR PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

  20. Spin02 J.Kiryluk(UCLA) STAR BBC Demonstrate that asymmetry sensitivity better than 1/1000 Small since p+ p－ cancellation ? BBC Asymmetry Asymmetry Measured by RHIC polarimeter PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

  21. Spin02 Y.Fukao(Kyoto) Panic02 M.Togawa(Kyoto) Neutron Veto EM Cal Base Charge Veto PbWO4 Hadron Cal Base Scintillator Post-shower Pb W+Fiber Cal 12 O‘clock（local polarimeter for PHENIX) p0 PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

  22. 12 O’clock PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

  23. Asymmetries (AN) seen PT XF 0.2 0.4 0.6 0.8 p0 +10 ~ +20% STAR TPC PHENIX MUON PHENIX CENTRAL STAR FPD BBC pp2pp Neutron -10% g -3% p0 <3% 0o CAL 0 1 2 3 4 5 Rapidity Charged +1% PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

  24. Coming Run with longitudinal polarization3pb-1,P=50% expectations W. Vogelsang PHENIX Charged STAR JET DG will be directly probed PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

  25. Summary and Outlook • RHIC spin program has begun. We have a series of program over 5 years to go. • Y2001-2, The first polarized proton collision was successfully done with transversely polarized beam, produced unexpected spin phenomena which may relate to unknown behavior of QCD (transversity etc) • Y2002-3, The first measurements of helicity asymmetry will SOON be performed @200GeV. Sizable DG generates surprises in the data. • Y2003+, Statistics will be much improved @200GeV, ensuring the determination of DG . “Spin Crisis” will hopefully be solved by then. • Y2005+, Weak Bosons will be produced at RHIC, the NEW “flavor sensitive” tool for the anti-quark/quark polarization and unpolarized structure function of anti-quark measurements. • And beyond… PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

  26. Many Thanks To RHIC Spin Collaboration(Spokesman: G. Bunce) Spin physics is an integral part of the goals of the STAR, PHENIX and pp2pp experiments. RHIC Accelerator Spin Group(Spokesman: T.Roser, Project Manager: W.Mackay) RIKEN and RIKEN/BNL Research Center (Group Leaders: H. En’yo, G.Bunce, N. Saito), Theory Group （W.Forgelsang et.al.) STAR Spin Physics Working Group (Conveners: L. Bland, G. Eppley) PHENIX Spin Physics Working Group (Conveners: Y. Goto, M. Perdekamp) pp2pp Experiment (Spokesman: W. Guryn) BNL Groups: RHIC Spin Group (Group Leader: G. Bunce); KEK Accelerator Group(Y. Mori et al.); Laboratory / University participation Kyoto-U, TITech, ANL, IUCF, KEK and many others . PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

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