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Heavy Flavor A LL Study at RHIC

Heavy Flavor A LL Study at RHIC. Ming X. Liu Los Alamos National Lab (For the PHENIX Collaboration) Latest news from Run6 Outlook. proton beam.  or . gluon. photon.  or . proton beam. proton beam.  or . gluon. heavy flavor. gluon.  or . proton beam.

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Heavy Flavor A LL Study at RHIC

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  1. Heavy Flavor ALL Study at RHIC Ming X. Liu Los Alamos National Lab (For the PHENIX Collaboration) Latest news from Run6 Outlook

  2. proton beam  or  gluon photon  or  proton beam proton beam  or  gluon heavy flavor gluon  or  proton beam G Measurements @RHIC • Polarized p+p collisions • double longitudinal spin asymmetry • leading-order gluon measurement • heavy-flavor production • Light hadrons, direct photons SPIN2006 Ming X. Liu

  3. PHENIX Experiment • Central Arms: ||<0.35, = • Electrons, photons, light hadrons • Muon Arms: 1.2<||<2.4, =2 • Muons, light hadrons • BBC and ZDC: Luminosity SPIN2006 Ming X. Liu

  4. cceX bbeX J/ x Heavy Quark Measurements @PHENIX • Sensitive to gluon polarization: Dg(x) • Gluon Fusion dominates at LO PYTHIA estimate: Double spin asymmetry: Karliner & Robinett, Phys.Lett.B324 (1994) aLL Decay modes: J/Psi: e+e-, +- Charm: eX, X, e etc. 1.5 2 5 SPIN2006 Ming X. Liu

  5. J/ Production in p+p Collisions • LO NRQCD: mix of various processes SPIN2006 Ming X. Liu

  6. PHENIX, PRL 92, 051802 (2004) NRQCD and PHENIX data: X-section Theoretical predictions of J/Ψ production at RHIC are in good agreement with the PHENIX data: COM process dominant • PRD 68 (2003) 034003 G. Nayak, M. Liu, F. Cooper • PRL 93 (2004) 171801 F. Cooper, M. Liu, G. Nayak SPIN2006 Ming X. Liu

  7. + J/ * - More on J/ Production Mechanism- J/Psi polarization - a key probe?- Spin dynamics in pQCD α= +1: transversely polarized α= -1: longitudinally polarized α= 0: no polarization hep-ph/0106120 M. Kramer SPIN2006 Ming X. Liu

  8. Solid = Dashed = Dash-dot = Dotted = CSM ALL and J/Psi Production @RHIC GS-A(NLO) GS-A(LO) PRD 56,7331(1997) GS-A NLO - Sensitive to gluon polarization distr. - Good “x” measurement - Weak process-dependence LO SPIN2006 Ming X. Liu

  9. 10 20 30 0 ALL: NRQCD and CSM PRD 68, 034017(2003) Not very sensitive to “fragmentation” processes SPIN2006 Ming X. Liu

  10. J/Psi from Y06 Data • Run6 pp dimuon events: • 5 pb-1 from Level-2 • 16K • Fill-by-Fill analysis • Within a store, beam pol fixed Dimuon mass SPIN2006 Ming X. Liu

  11. Inclusive J/Psi events Background estimation S/B~10 Fill-by-fill, beam pol from CNI Relative luminosity BBC and ZDC trigger counts +- ++ -- Experimental Approach SPIN2006 Ming X. Liu

  12. GS-A NLO LO J/ ALL from Run6 Gluon Pol. Models SPIN2006 Ming X. Liu

  13. J/ ALL @RHIC - Outlook • @pT=5GeV, GS G(NLO) • 1 A-C: 65 pb-1(RHIC-I) • 3 A-C: 10xRHIC-I (RHIC-II) • 3 A-B: 40xRHIC-I Good for exploring large G… SPIN2006 Ming X. Liu

  14. PHENIX Preliminary Open Charm for Precision Measurements • Open Charm via Muons and Electrons • A lot more statistics: ~ a few x 102 more • S/B ~ O(1) (S/B >> O(1) with VTX upgrade) • Run5 full data production just finished SPIN2006 Ming X. Liu

  15. Summary and Outlook • Probe gluon polarization with heavy quarks • J/psi: lvl-2 filtered data (Run5+6) • Open charm: coming soon • Need more theoretical calculations to study sensitivity PRD 74 014015 SPIN2006 Ming X. Liu

  16. backup SPIN2006 Ming X. Liu

  17. GS-A NLO LO ALL and Gluon Polarization L ~ 10xRHIC-I SPIN2006 Ming X. Liu

  18. GS PDF(PRD 1996) LO NLO SPIN2006 Ming X. Liu

  19. Inclusive J/Psi |M - MJpsi| < 2 Background (+-) 1.8< M < 2.5 GeV Asymmetries fill-by-fill SPIN2006 Ming X. Liu

  20. Beam shuffling - random beam polarization Systematic Checks SPIN2006 Ming X. Liu

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