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Experimental Studies of Quark Gluon Plasma at RHIC

Experimental Studies of Quark Gluon Plasma at RHIC. ShinIchi Esumi Inst. of Physics, Univ. of Tsukuba. Collective expansion of QGP Enegy loss of partons in QGP. QGP. Hadron. RHIC(200GeV). LHC(5500GeV). SPS (17GeV). AGS (4GeV). BNL. CERN. STAR experiment.

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Experimental Studies of Quark Gluon Plasma at RHIC

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  1. Experimental Studies of Quark Gluon Plasma at RHIC ShinIchi EsumiInst. of Physics, Univ. of Tsukuba Collective expansion of QGP Enegy loss of partons in QGP ShinIchi Esumi, Univ. of Tsukuba

  2. QGP Hadron ShinIchi Esumi, Univ. of Tsukuba

  3. RHIC(200GeV) LHC(5500GeV) SPS (17GeV) AGS (4GeV) BNL CERN STAR experiment ALICE experiment PHENIX experiment ShinIchi Esumi, Univ. of Tsukuba

  4. Chemical freeze-out the end of inelastic interactions, when the particle species and ratios are frozen Phys. Rev. C 73(2006) 034905 ShinIchi Esumi, Univ. of Tsukuba

  5. Thermal freeze-out the end of elastic interactions, when the momentum spectra are frozen Teff = Tfo+ 0.5 m v 2 locally thermal SPS Pb+Pb Central RHIC Au+Au Peripheral RHIC Au+Au Central collective expansion radial flow ShinIchi Esumi, Univ. of Tsukuba

  6. AuAu Central charm hadron AuAu Central strangeness hadron AuAu Central , K, p SQM06, Yifei Zhang SQM06, Yifei Zhang nucl-ex/0307024 History of hadron freeze-out ShinIchi Esumi, Univ. of Tsukuba

  7. z x y x z sideward flow (v1) Reaction Plane (R.P.) y elliptic azimuthal event anisotropy low pT high pT elliptic flow (v2) x -p 0 p fparticle-FR.P. (rad) initial geometryfinal momentum anisotropy Anisotropic flow dN/df ShinIchi Esumi, Univ. of Tsukuba

  8. Hadron Phys. Rev. Lett. 99, 052301 (2007) Partonic collectivity --- particle identified v2 --- Number of constituent quark scaling in hadron v2 as well as multi-strange baryon v2: v2 is already established during the quark phase before the hadronization. This seems to be true even for heavy quark like charm. QM08: A.Dion QM06 STAR preliminary ShinIchi Esumi, Univ. of Tsukuba

  9. Hadron Quark momentum distribution --- extracted from multi-strange hadron ratio --- arXiv:0801.2265 [nucl-th] d-quark d-quark s-quark s-quark • Collective radial expansion • during the partonic phase • before the hadronic phase • Quark coalescence or • recombination mechanism • for the hadronization ShinIchi Esumi, Univ. of Tsukuba

  10. Source geometry --- quantum interferometry via HBT correlation --- common initial source geometry from centrality measurement AGS RHIC final source geometry from HBT measurement final particle emission anisotropy from v2 measurement ShinIchi Esumi, Univ. of Tsukuba

  11. Jet quenching --- energy loss of parton in QGP --- No energy loss for g‘s Energy loss for quark and gluon jets (similar even for heavy quark) v2 RAA PHENIX preliminary ShinIchi Esumi, Univ. of Tsukuba

  12. Jet modification --- at pT = 1~4 GeV/c --- jet jet p p p p Au Au Leading hadrons Medium Back-to-back jet suppression --- 2 particle  correlation --- ShinIchi Esumi, Univ. of Tsukuba

  13. h-h correlation at “p+p 200GeV” vs “Au+Au 200GeV central 0-20%” associate pT window Phys. Rev. C 78, 014901 (2008) trigger pT window ShinIchi Esumi, Univ. of Tsukuba

  14. near-side away-side in-planeout-of-plane in-planeout-of-plane Reaction plane dependent energy loss--- a dominant source of v2 at high pT --- QM09, C. H. Chen in-plane out-of-plane QM04: STAR ShinIchi Esumi, Univ. of Tsukuba

  15. (1) (8) (2) (7) (3) (6) in-plane (4) (5) (5) (4) (6) (3) (7) (2) (8) (1) 200GeV Au+Au -> h-h (run7) (pTTrig=2~4GeV/c, pTAsso=1~2GeV/c) mid-central : 20-50% QM09: PHENIX (4) s=[-1,0]/8 (5) s=[0,1]/8 in-plane trigger selection (3) s=[-2,-1]/8 (6) s=[1,2]/8 in-plane associate regions c2(data) - c2(flow) (2) s=[-3,-2]/8 (7) s=[2,3]/8 s = Trig. R.P. [] strong preference of associate particle emission towards the in-plane direction (1) s=[-4,-3]/8 (8) s=[3,4]/8 out-of-plane trigger selection average PHENIX preliminary Asso.Trig. (rad) ShinIchi Esumi, Univ. of Tsukuba

  16. jet parton nucleon nucleon Au+Au ??? (STAR@RHIC) p+p jet+jet (STAR@RHIC) ShinIchi Esumi, Univ. of Tsukuba

  17. ,Jet,0 - hadron correlation Comparisons are the most important! RHIC-AGS’09, Y. S. Lai Closer and closer to the initial parton energy Gamma trigger Jet (large R) trigger Jet (small R) trigger 0(hadron) trigger more and more surface bias given by energy loss ShinIchi Esumi, Univ. of Tsukuba

  18. Back-to-back Jet Calorimeter for LHC-ALICE experiment ShinIchi Esumi, Univ. of Tsukuba

  19. Fit effective FF’s with -Triggered Away-side Correlations:Jet Fragmentation Function in p+p and Au+Au QM09 PHENIX • p+p: b = 6.89 ± 0.64 • Au+Au: b = 9.49 ±1.37 • Difference reflects influence of the medium ShinIchi Esumi, Univ. of Tsukuba

  20. TC Tch <b> 200 400 600 dNch/dh Thermal photon radiation Tinit Tkin PHENIX, arXiv:0804.4168v1 [nucl-ex] Slope parameter (0-20%):T = (221 ± 23 ± 18) MeV Various Hydro models: TInitial = 300~600 MeV ShinIchi Esumi, Univ. of Tsukuba

  21. Summary * History of chemical/thermal freeze-out * Radial and elliptic collective expansions --- in partonic and hadronic stages * Jet quenching via parton energy loss --- suppression and re-distribution ShinIchi Esumi, Univ. of Tsukuba

  22. J/ suppression Centrality (Npart) RAA cold nuclear matter effect cold nuclear matter effect Au+Au forward-rapidity Au+Au mid-rapidity SPS-like suppression + regeneration ShinIchi Esumi, Univ. of Tsukuba

  23. Df*=0 Dq*=p jet Deflected Jets Cone like Jets p p PHENIX Preliminary PHENIX Preliminary Au Au 3-particle correlation “Df12 vs Df13” d+Au Collisions Both measurements prefer Mach-cone scenario. (1-2)/2 Au+Au Central 0-12% Cone angle (radians) No pT dependence, too. STAR Preliminary (1-2)/2 pT (GeV/c) STAR Preliminary ShinIchi Esumi, Univ. of Tsukuba

  24. SQM09, F. Wang ShinIchi Esumi, Univ. of Tsukuba

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