//Nxu/tex3/TALK/2004/10USTC Collective Dynamics in High-Energy Collisions, USTC, October 18-19, 2004 Nu Xu 1 Charm Production at RHIC (1) Introduction.

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//Nxu/tex3/TALK/2004/10USTC Collective Dynamics in High-Energy Collisions, USTC, October 18-19, 2004 Nu Xu 1 Charm Production at RHIC (1) Introduction (2) Results from STAR (selected) - electron spectra from p+p and d+Au - Open charm hadron spectrum from d+Au - v 2 from Au+Au (3) Summary and outlook Many Thanks to: Organizers X. Dong, S. Esumi, H. Huang, H. Ritter, K. Schweda, P. Sorensen, A. Tai, Z. Xu E.L. Bratkovskaya, L. Grandchamp, J. Raufeisen, R. Vogt Nu Xu -- LBNL

//Nxu/tex3/TALK/2004/10USTC Collective Dynamics in High-Energy Collisions, USTC, October 18-19, 2004 Nu Xu 2 Predictions from QCD: The QGP Quark-hadron t = sec T = 1 GeV t = 5  sec T=1 MeV The Planck epoch Today Baryochemical Potential  B [MeV] Temperature Tch [MeV] AGS SIS SPS RHIC hadron gas neutron stars early universe atomic nuclei deconfinement chiral symmetry restoration A QGP is believed to have existed in the first few moments after the big bang, and presumably at the center of neutron stars. quark-gluon plasma

//Nxu/tex3/TALK/2004/10USTC Collective Dynamics in High-Energy Collisions, USTC, October 18-19, 2004 Nu Xu 3 High-energy nuclear collisions S. Bass Experimental approaches: Energy loss - ‘jet-quenching’ Elliptic flow - v 2, radial flow Charm - productions plus the combination (1) and (2) Hadronization and Freeze-out Initial conditions (1)Initial condition in high-energy nuclear collisions (2)The cold-QCD-matter, small-x, high-parton density - parton structures in nucleon / nucleus Parton matter - QGP - The hot-QCD Initial high Q 2 interactions (1)Hard scattering production - QCD prediction (2)Interactions with medium - deconfinement/thermalization (3)Initial parton density

//Nxu/tex3/TALK/2004/10USTC Collective Dynamics in High-Energy Collisions, USTC, October 18-19, 2004 Nu Xu 4 QCD Energy Scale s-quark mass ~ 0.2 GeV, similar to values of T C critical temperature  QCD QCD scale parameter T CH chemical freeze-out temperature   = 4  f  chiral breaking scale mCmC c-quark mass ~ GeV >>  QCD -- pQCD production - parton density at small-x -- QCD interaction - medium properties R cc ~ 1/m C => color screening J/  => deconfinement and thermalization heavy-flavors u-, d-, s-quarks: light-flavors || c-, b-quarks: heavy-flavors 1/x

//Nxu/tex3/TALK/2004/10USTC Collective Dynamics in High-Energy Collisions, USTC, October 18-19, 2004 Nu Xu 5 Energy Loss, Dead-cone Effect Energy Loss: 1)Heavy quark gluon radiation is reduced in the colored medium 2)Less energy loss for charm- hadrons -> less suppressions 3)Test partonic energy loss assumption 4)Implication on both open- and close-charm hadrons spectra! M. Djordjevic and M. Gyulassy, nucl-th/ Yu. Dokshitzer and D. Kharzeev, Phys. Lett. B519, 199(2001)

//Nxu/tex3/TALK/2004/10USTC Collective Dynamics in High-Energy Collisions, USTC, October 18-19, 2004 Nu Xu 6 J/  via coalescence J/  J/  in central AA collisions,  due to interaction with light flavors, values of mean p T decrease and yields increase  deconfinement and thermalization for light flavors L. Grandchamp and R. Rapp, hep-ph/ (02)

//Nxu/tex3/TALK/2004/10USTC Collective Dynamics in High-Energy Collisions, USTC, October 18-19, 2004 Nu Xu 7 Open-/closed-charm hadron yields A. Andronic, P. Braun-Munzinger, K. Redlich, J. Stachel, Phys.Lett. B571, 36(03). L. Grandchamp and R. Rapp, Phys. Lett. B523, 60(01). (1) open charm cross; (3) medium effects (  properties); (2) direct pQCD production; (4) absorption (color screening) Model results are different, centrality dependence measurements are important! RHIC

//Nxu/tex3/TALK/2004/10USTC Collective Dynamics in High-Energy Collisions, USTC, October 18-19, 2004 Nu Xu 8 Charm collectivity at RHIC Through multiple rescatterings, partonic/hadronic, collective motion has been developed for charmed hadrons at RHIC! 1)D-mesons lose their energy due to the hard spectrum at production 2)J/  increase in p T due to coalescence process 3)Both attained finite value of elliptic flow v 2 HSD Model: E.L. Bratkovskaya, W. Cassing, H. Stocker, and N. Xu, nucl-th/ (2004)

//Nxu/tex3/TALK/2004/10USTC Collective Dynamics in High-Energy Collisions, USTC, October 18-19, 2004 Nu Xu 9 y x pypy pxpx coordinate-space-anisotropy  momentum-space-anisotropy Anisotropy parameter v 2 Initial/final conditions, EoS, degrees of freedom

//Nxu/tex3/TALK/2004/10USTC Collective Dynamics in High-Energy Collisions, USTC, October 18-19, 2004 Nu Xu 10 Open charm v 2 X. Dong, S. Esumi, P. Sorensen, N. Xu and Z. Xu, Phys. Lett. B597, 328(2004). At p T > 2.5 GeV/c: 1) D-meson spectrum is ‘hard’, yields of pion will be small, measure D- decayed electron to infer the open charm v 2 2) D-meson flow  indication of light flavor thermal equilibrium.

//Nxu/tex3/TALK/2004/10USTC Collective Dynamics in High-Energy Collisions, USTC, October 18-19, 2004 Nu Xu 11 Charm Measurements PHENIX: Electrons and Muons STAR: Electrons and directly reconstructed Ds

//Nxu/tex3/TALK/2004/10USTC Collective Dynamics in High-Energy Collisions, USTC, October 18-19, 2004 Nu Xu 12 STAR: TPC & MRPC-TOF TPC dE/dx PID: pion/kaon: p T ~ 0.6 GeV/c; proton p T ~ 1.2 GeV/c A new technology - Multi-gap Resistive Plate Chamber (MRPC), adopted from CERN- Alice  A prototype detector of time-of-flight (TOFr) was installed in Run3  One tray: ~ 0.3% of TPC coverage  Intrinsic timing resolution: ~ 85 ps pion/kaon ID: p T ~ 1.7 GeV/c proton ID: p T ~ 3 GeV/c

//Nxu/tex3/TALK/2004/10USTC Collective Dynamics in High-Energy Collisions, USTC, October 18-19, 2004 Nu Xu 13 Hadron identification: STAR Collaboration, nucl-ex/ STAR TOFr PID Electron identification: TOFr |1/ß-1| < 0.03 TPC dE/dx electrons!!! electrons

//Nxu/tex3/TALK/2004/10USTC Collective Dynamics in High-Energy Collisions, USTC, October 18-19, 2004 Nu Xu 14 D 0 direct reconstruction Event mixing technique ( Br. 3.83%) C. Adler et al., Phys. Rev. C 66, (R)(2002) H. Zhang, J. Phys. G 30, S577(2004) First Direct Open Charm Reconstruction at RHIC STAR Preliminary

//Nxu/tex3/TALK/2004/10USTC Collective Dynamics in High-Energy Collisions, USTC, October 18-19, 2004 Nu Xu 15 Electron spectra An increasing excess found at higher p T region, p T > 1.0 GeV/c,  Expected contribution of semi-leptonic decays from heavy flavor hadrons STAR: nucl-ex/ STAR Preliminary

//Nxu/tex3/TALK/2004/10USTC Collective Dynamics in High-Energy Collisions, USTC, October 18-19, 2004 Nu Xu 16 Consistent in D measurements Directly reconstructed D mesons D and electron spectra are consistent! STAR: nucl-ex/ STAR Preliminary Electrons from D decay

//Nxu/tex3/TALK/2004/10USTC Collective Dynamics in High-Energy Collisions, USTC, October 18-19, 2004 Nu Xu 17 Open charm production at RHIC - pQCD distributions are steeper - - Fragmentation with delta function has harder spectrum -Total cross sections are lower, a factor of R. Vogt, 2004

//Nxu/tex3/TALK/2004/10USTC Collective Dynamics in High-Energy Collisions, USTC, October 18-19, 2004 Nu Xu 18 Charm production cross-section 1) NLO pQCD calculations under-predict the ccbar production cross section at RHIC 2)Power law for ccbar production cross section from SPS to RHIC: n ~ 2 (n~0.5 for charged hadrons) 3)Large uncertainties in total cross section due to rapidity width, model dependent(?). STAR Preliminary

//Nxu/tex3/TALK/2004/10USTC Collective Dynamics in High-Energy Collisions, USTC, October 18-19, 2004 Nu Xu 19 Open charm production at RHIC 1)d  /dy   : a factor from model like Pythia. At 200 GeV, the factor 4.7 was used at STAR. 2) A strong dependent on the method of fragmentation in charm p T spectra observed, but not on rapidity distributions. J. Raufeisen and J. Peng, Phys.Rev. D67, (2003) HSD: Phys. Rev. C67, (2003).

//Nxu/tex3/TALK/2004/10USTC Collective Dynamics in High-Energy Collisions, USTC, October 18-19, 2004 Nu Xu 20 Non-photonic electron v 2 STAR: 0-80% (F.Laue SQM04) PHENIX: Minimum bias statistical error only corrected for e ± from  decay M. Kaneta et al, J.Phys. G30, S1217(04) Greco, Ko, Rapp, Phys. Lett. B595, 202(04)

//Nxu/tex3/TALK/2004/10USTC Collective Dynamics in High-Energy Collisions, USTC, October 18-19, 2004 Nu Xu 21 Open charm v 2 - a comparison 1)Constituent Quark Scaling for open charm hadron production? 2)Flow of charm-quark and the thermalization among light flavors? 3)…???? X. Dong, S. Esumi, P. Sorensen, N. Xu and Z. Xu, Phys. Lett. B597, 328(2004).

//Nxu/tex3/TALK/2004/10USTC Collective Dynamics in High-Energy Collisions, USTC, October 18-19, 2004 Nu Xu 22 Summary 1)First J/  data at RHIC, much more statistics needed. 2)Open charm yields measured in both 200GeV p+p and d+Au collisions. No evidence of deviation from binary collision scaling in d+Au collisions 3)Perturbative calculations under predicted both yields and spectrum shape. Hadronization process not under control 4)Study open charm v 2 and J/  yields to address thermalization issues at RHIC. The run-IV data will just do that.

//Nxu/tex3/TALK/2004/10USTC Collective Dynamics in High-Energy Collisions, USTC, October 18-19, 2004 Nu Xu 23 Thermal Equilibrium at RHIC At RHIC, yields of open charm is high: 1) The rescattering will lead to collective motion and thermalization among partons. Since m C >> T 0 and m u,d,s thermal equilibrium is first reachable among light flavors. 2) Coalescence of charm quarks will lead to the enhancement of J/  production and thermal-like spectra in central nucleus-nucleus collisions.  Study open charm and J/  spectra and v 2  Study J/  yields versus collision centrality

//Nxu/tex3/TALK/2004/10USTC Collective Dynamics in High-Energy Collisions, USTC, October 18-19, 2004 Nu Xu 24 Upgrade at STAR STAR MRPC - TOF STAR MicroVertex Tracker Active pixel sensors (APS) Two layers of thin silicon - Full open charm measurements - Full resonance measurements with both hadron and lepton decays