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Zebo Tang University of Science and Technology of China (USTC)

Open and Closed Charm measurements at RHIC. Zebo Tang University of Science and Technology of China (USTC). Open charm measurements at RHIC. STAR measurements: Signal/Spectra D 0  K c   + X (y=0, low p T ) c  e + X Flow & energy loss

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Zebo Tang University of Science and Technology of China (USTC)

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  1. Open and Closed Charm measurements at RHIC Zebo Tang University of Science and Technology of China (USTC) RHIC&AGS Users' Meeting, BNL, June 1-5, 2009

  2. Open charm measurements at RHIC STAR measurements: • Signal/Spectra D0 K • c   + X (y=0, low pT) • c  e + X • Flow & energy loss Radial flow from NPE RAA from NPE • Correlations D*-jet, e-h, e-D0 PHENIX measurements: • Signal/Spectra D0 K-+0 • c   + X (<y>=1.65, pT>1 GeV/c) • c  e + X • e+e- • Flow & energy loss Elliptic flow from NPE RAA from NPE • Correlations e-h, e-m RHIC&AGS Users' Meeting, BNL, June 1-5, 2009

  3. STAR:PRL98(2007) 192301 Energy loss PHENIX:PRL98(2007)172301 Strong suppress, energy loss Similar magnitude as light hadrons Bottom yields and bottom energy loss? RHIC&AGS Users' Meeting, BNL, June 1-5, 2009

  4. Heavy flavor feeddown Carla M. Vale, QM2009 Good high pT J/y measurements are needed Small effect on RAA No conclusion change RHIC&AGS Users' Meeting, BNL, June 1-5, 2009

  5. Correlation Bertrend Biritz, QM2009 arXiv:0903.4851 B is also suppressed Radiative energy loss unfavored PHENIX, arXiv:0903.4851 RHIC&AGS Users' Meeting, BNL, June 1-5, 2009

  6. path length L Quark path length L STAR preliminary hard parton Quark pT (GeV/c) Quark Jet flavor conversion? Yichun Xu, QM2009 hard parton gluon Kaon consistent with Jet conversion How about charm and bottom? How about LHC energy? RHIC&AGS Users' Meeting, BNL, June 1-5, 2009

  7. Forward rapidity Carla M. Vale, QM2009 More suppression at forward rapidity? need more statistics, better systematic control, and in Au+Au RHIC&AGS Users' Meeting, BNL, June 1-5, 2009

  8. ? Quarkonium melting in medium Ágnes Mócsy, QM2009 • Suppression has long be proposed as a signature of QGP formation • Plasma thermometer • Quarkonium production mechanism RHIC&AGS Users' Meeting, BNL, June 1-5, 2009

  9. Color octet Color singlet NRQCD Charmonium production mechanism • Color singlet model (CSM),LO underpredicted CDF data by order of magnitude • Color octet model (COM), LO good agreement with CDF cross section disagreement with CDF polarization • CSM*, NLO better agreement NNLO* applicable at pT>5-7 GeV/c • COM* improvement of polarization, NLO will come, valid at pT>3 GeV/c • CSM+s-channel cut valid at low pT LO Decay feeddown (CDF): y(2s): 7%-15%, slightly increase with pT cc0,1,2: ~30%, slightly decrease with pT B: Strong pT dependence Know your reference! RHIC&AGS Users' Meeting, BNL, June 1-5, 2009

  10. Charmonium measurements at RHIC STAR measurements: • Mid-rapidity (ee) L2 J/y trigger: low pT in p+p EMC trigger: high pT in p+p, Cu+Cu, d+Au BJ/y in p+p Minbias: low pT in Au+Au, Cu+Cu, d+Au • Forward rapidity (ee) J/y and cc in p+p (2.5<h<4.0) PHENIX measurements: • Mid-rapidity (ee) J/y in p+p, d+Au, Cu+Cu, Au+Au (low and intermediate pT) y’ and cc in p+p • Forward rapidity (mm) J/y in p+p, d+Au, Cu+Cu, Au+Au (1.2<|h|<2.2) RHIC&AGS Users' Meeting, BNL, June 1-5, 2009

  11. Low pT spectra in p+p CSM+s-channel cut works well at intermediate pT RHIC&AGS Users' Meeting, BNL, June 1-5, 2009

  12. STAR Preliminary High pT spectra in p+p Significantly extend previous measurements from 5 to 14 GeV/c CEM, LO COM describe overall trend, leave little to no room for feeddown NNLO* CSM, steeper than data RHIC&AGS Users' Meeting, BNL, June 1-5, 2009

  13. pT>2 GeV/c pT>5 GeV/c STAR Preliminary xT scaling n is related to the number of point-like constituents taking an active role in the interaction n=8: diquark scattering n=4: QED-like scattering  and proton at pT>2 GeV/c: n=6.6±0.1 (PLB 637, 161(2006)) J/ at high pT: n=5.6±0.2 (close to CS+CO prediction) Soft processes affect low pT J/ production RHIC&AGS Users' Meeting, BNL, June 1-5, 2009

  14. Forward rapidity Chris Perkins, QM2009 J/y ccJ/y Further constrain models High xF intrinsic heavy flavor RHIC&AGS Users' Meeting, BNL, June 1-5, 2009

  15. Polarization Cesar Luiz da Silva, QM2009 RHIC&AGS Users' Meeting, BNL, June 1-5, 2009

  16. Feeddown Susumu X. Oda, QM2008 R(ψ’) =8.6±2.5% PHENIX R(c) <42% (90%C.L.) PHENIX c→J/ +  RHIC&AGS Users' Meeting, BNL, June 1-5, 2009

  17. BJ/y STAR Preliminary arXiv:0904.0439 No significant near side correlation B contribution (13  5) % Little room for parton fragmentation RHIC&AGS Users' Meeting, BNL, June 1-5, 2009

  18. Constrain bottom yields STAR Preliminary arXiv:0904.0439 Gang Wang, QM2008 • pQCD predicts significant BJ/ • correlations shows low B contribution • can be used to further constrain B yields • constrain Be • M. Cacciari, P. Nason and R. Vogt RL 95(2005),122001; CLEO collaboration PRL 89(2002),282001 RHIC&AGS Users' Meeting, BNL, June 1-5, 2009

  19. RAA at low pT J/y PHENIX, PRL98, 232301 • Similar suppression as that at SPS • More suppression at forward rapidity • Regeneration? Sequential suppression? RHIC&AGS Users' Meeting, BNL, June 1-5, 2009

  20. RAA(pT~5.5)>AdS/CFT+Hydro (93% C.L.) RAA(pT~7.0)>AdS/CFT+Hydro (94% C.L.) Combined: 99% Contrast to AdS/CFT+Hydro prediction PHENIX Spectra not available, prevents statistics analysis No way PHENIX can make conclusion contrasting to STAR RAA at high pT STAR Cu+Cu 0-20%: RAA(pT>5) = 1.40.40.2 No suppression RAA(pT~5.5)>0.6 (86% C.L.) RAA(pT~7.0)>0.6 (82% C.L.) Combined: 97% Indicates increase of RAA RHIC&AGS Users' Meeting, BNL, June 1-5, 2009

  21. RAA at high pT • Consistent with no suppression at high pT: RAA(pT>5 GeV/c) = 1.4± 0.4±0.2 • Indicates RAA increase from low pT to high pT • How does production mechanism (CS vs. CO) affect energy loss? • Contrast to AdS/CFT+ Hydro prediction • (H. Liu, K. Rajagopal and U.A. WiedemannPRL 98, 182301(2007),T. Gunji, JPG 35, 104137(2008) • Good jobs: • two-component model, leakage and B feeddown is important • (R. Rapp, X. Zhao, arXiv:0806.1239) • transport+hydro, from initial produced instead of regenerated • (Y.Liu, Zhen Qu, N. Xu and P. Zhuang, arXiv:0901.2757) RHIC&AGS Users' Meeting, BNL, June 1-5, 2009

  22. Elliptic flow pT integrated v2 = (-10±10)% @ |y|<0.35 and(-9.3 ± 9.2)% @ -1.2<|y|<1.2 Ermias T. Atomssa QM2009 Inherit open charm flow or not? Regeneration? Too early to compare to models, need more statistics RHIC&AGS Users' Meeting, BNL, June 1-5, 2009

  23. PHENIX J/ymm 500 GeV p+p Future STAR J/yee L3 trigger, Online tracking More and more statistics Better and better detectors Better and better techniques Bright future, better understanding RHIC&AGS Users' Meeting, BNL, June 1-5, 2009

  24. backup RHIC&AGS Users' Meeting, BNL, June 1-5, 2009

  25. Why heavy flavor Muller nucl-th/0404015 Wicks et al,NPA 784 (2007) 426 • Heavy quark masses are not modified by QCD vacuum. Strong interactions do not affect them. • Important tool for studying properties of the hot-dense matter created at RHIC energy. RHIC&AGS Users' Meeting, BNL, June 1-5, 2009

  26. Flow STAR: nucl-ex/0805.0364, Y. Zhang, QM2008 PRL, 98, 172301 (2007), D. Hornback, QM2008 STAR Preliminary • Tfo = 220 MeV (best fit) – freeze out earlier • <t> = 0.23 (best fit), <0.42 (1-) • favor moderate or small radial flow. • 2. Sizable v2  strong-interacting Quark Gluon Plasma RHIC&AGS Users' Meeting, BNL, June 1-5, 2009

  27. STAR Preliminary Beam pipe + SVT + SSD+ Dalitz Count Beam pipe + Dalitz TPC Inner Field cage Outlook: HF-lepton Run-3 Projection (0.4/nb) Run-8 Run 8 data compared to run3 Material in front of TPC reduced by an order of magnitude Final charm cross section is in progress RHIC&AGS Users' Meeting, BNL, June 1-5, 2009

  28. D0 Phys. Rev. Lett. 94 (2005) Outlook: Direct reconstruction Before background Small signal to background ratio Precise vertexing will helps a lot Still long way to go HFT Simulation S. Butyk (QM2008 poster) PHENIX Preliminary Year5 pp 200 GeV RHIC&AGS Users' Meeting, BNL, June 1-5, 2009

  29. Open charm Radial flow (thermal) Sizeable elliptic flow Strong suppression at high pT (energy loss) Total charm cross section Be Charmonium Regeneration possible Inherit elliptic flow Lose energy (CO) No energy loss (CS) Model input BJ/y How does open affect closed RHIC&AGS Users' Meeting, BNL, June 1-5, 2009

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