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Charm production at STAR

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Presentation on theme: "Charm production at STAR"— Presentation transcript:

1 Charm production at STAR
Yifei Zhang University of Science & Technology of China 10th Particle Physics Conference April 26-28, Nanjing, China Thanks to the conference organizers

2 Introductions Signal/Spectra Flow & energy loss Correlations
Outline Introductions Signal/Spectra Flow & energy loss Correlations Summary & Outlook November 29, 2018 Yifei Zhang USTC

3 Why measure charm? Mb  4.8 GeV >> Tc, LQCD, Muds Mc  1.3 GeV
Higgs mass: electro-weak symmetry breaking. (current quark mass) QCD mass: Chiral symmetry breaking. (constituent quark mass) 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. Muller nucl-th/ November 29, 2018 Yifei Zhang USTC

4 Charm production cross-section
Charm quarks are believed to be mainly produced at early stage by initial gluon fusions. Sensitive to initial parton distribution function. Nuclear and medium properties at initial stage. Precondition for light flavor thermalization if charm flow.. Essential for recombination calculations of J/ production. M. Gyulassy & Z. Lin, PRC 51 (1995) 2177 Npart L.Yan, P.Zhuang, N.Xu PRL 97 (2006) PHENIX data nucl-ex/ November 29, 2018 Yifei Zhang USTC

5 Relativistic Heavy Ion Collider (RHIC) Brookhaven National Laboratory (BNL), Upton, NY
November 29, 2018 Yifei Zhang USTC

6 Charm measurements at STAR
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 e-h, e-D0 November 29, 2018 Yifei Zhang USTC

7 Charm measurement at STAR
Direct D0 reconstruction muon from charm semileptonic decay electron from heavy quark semileptonic decay - semileptonic decay hadronic decay c  e+ + anything (B.R.: 10.3%) c  + + anything (B.R.: 8.2%) c  l+ + anything (B.R.: 9.6%) D0  K, B.R.: 3.83% November 29, 2018 Yifei Zhang USTC

8 Introductions Signal/Spectra Flow & energy loss Correlations
Outline Introductions Signal/Spectra Flow & energy loss Correlations Summary & Outlook November 29, 2018 Yifei Zhang USTC

9 Direct D-meson reconstructions at STAR
Phys. Rev. Lett. 94 (2005) STAR Preliminary A. Shabetai QM08 K invariant mass distribution in d+Au, Au+Au minbias, Cu+Cu minbias at 200 GeV collisions. November 29, 2018 Yifei Zhang USTC

10 D0 & Lepton from HF decay at STAR
STAR Preliminary New Cu+Cu D0 spectrum agree with Au+Au after number of binary scaled. Low pT muon constrains charm cross-section. November 29, 2018 Yifei Zhang USTC

11 Charm cross-section Total cross-section with large theoretical uncertainty. d+Au: PRL 94 (2005) Cu+Cu: A. Shabetai QM08 Au+Au: Y. Zhang, JPG 32 (2006) S529 Both STAR and PHENIX are self-consistent. STAR results ~ 2 times larger than PHENIX Consistent with NLO calculation. November 29, 2018 Yifei Zhang USTC

12 Introductions Signal/Spectra Flow & energy loss Correlations
Outline Introductions Signal/Spectra Flow & energy loss Correlations Summary & Outlook November 29, 2018 Yifei Zhang USTC

13 Radial flow – lepton from HF decays
D0 STAR Preliminary STAR Preliminary Tfo = 220 MeV (best fit) – freeze out ealier <t> = 0.23 (best fit), <0.42 (1-). favor moderate or small radial flow. -- dense medium, light flavor thermalization. November 29, 2018 Yifei Zhang USTC

14 Charm energy loss, unsolved puzzle
No direct D-meson measurement at high pT. Heavy flavor electron suppression was observed in several experiments. STAR PRL, 98, (2007) Radiative + Collisional eloss calculations describe data better. Question: Partonic eloss mechanism? Bottom contribution? November 29, 2018 Yifei Zhang USTC

15 Introductions Signal/Spectra Flow & energy loss Correlations
Outline Introductions Signal/Spectra Flow & energy loss Correlations Summary & Outlook November 29, 2018 Yifei Zhang USTC

16 e-h correlations – conical emission
Trigger on NPE from heavy quark decays. Section XIII: G. Wang Cu+Cu 200 GeV Au+Au 200 GeV STAR Preliminary Does heavy quark e-loss generate Mach Cone emission? November 29, 2018 Yifei Zhang USTC

17 e-h correlations – bottom contribution
(be)/(ce+be) e-h: G. Wang, QM08 e-D0: A. Mischke, QM08 Simulation: ce, be, c+be Extract b/c ratio from the data/simulation comparison Good agreement among different analyses. Data consistent with FONLL. November 29, 2018 Yifei Zhang USTC

18 Does bottom affect charm X-sec?
STAR Preliminary Before subtraction: (AuAu MB) (AuAu 0-12%) After bottom contribution subtraction: (AuAu MB) (AuAu 0-12%) Bottom contribution does NOT change charm cross-section (be)/(b+ce) upper limit of NLO is applied November 29, 2018 Yifei Zhang USTC

19 None zero charm flow is observed at RHIC energy.
Summary Charm cross-section is found to follow number of binary collisions scaling. None zero charm flow is observed at RHIC energy. Electron suppression is observed at RHIC but the energy loss mechanism is still NOT really understood. Abounding correlations related to heavy flavor are reported. November 29, 2018 Yifei Zhang USTC

20 Outlook Currently… W/o inner tracker, direct measurement of D-mesons through topology reconstruction is impossible due to insufficient track projection resolution close to the collision vertex. Heavy Flavor Tracker Single muon can not be measured at high pT at STAR. Muon Telescope Detector Single electron is always suffered from the amount of photonic background. Full barrel Time Of Flight Detector Semileptonic decayed electron is not strongly sensitive to D-mesons. November 29, 2018 Yifei Zhang USTC

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