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Study of Parton Energy Loss with High-p T p 0 in Au+Au Co llisions at PHENIX

Study of Parton Energy Loss with High-p T p 0 in Au+Au Co llisions at PHENIX. Yoki Aramaki , for the PHENIX Collaboration Center for Nuclear Study, University of Tokyo. Physics Motivation. Observation of Jet Quenching Yield Suppression at high p T (A factor of 5 !)

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Study of Parton Energy Loss with High-p T p 0 in Au+Au Co llisions at PHENIX

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  1. Study of Parton Energy Loss with High-pTp0 inAu+AuCollisions at PHENIX Yoki Aramaki, for the PHENIX Collaboration Center for Nuclear Study, University of Tokyo

  2. Physics Motivation • Observation of Jet Quenching • Yield Suppression at high pT (A factor of 5 !) • Parton lose the energy with strong interaction • Energy Loss and Path Length (L) • Radiative Process in pQCD • Collisional Process in pQCD • Radiative Process in AdS/CFT (Ex. Phys.Lett.B685(2010)270) • Jet Quenching as Observable • Sensitive to the density of the medium • Test for the nature of the medium (Strong or Weak coupled?) JPS 2010 Autumn Meeting @ KYUTECH, Japan

  3. z x Measurement of RAA(pT, L) • Correspondence Relation • Path length (L) ↔ Azimuthal angle (Df) and Centrality RAA(pT, L) ↔ RAA(pT, centrality, Df) Light blue : long path length Red : short path length • Extraction of RAA(pT,Df) • Role of Anisotropy v2 at High pT Spatial anisotropy in non-central collisions influences RAA for each azimuthal angle. f-y  : Azimuthal angle of emitted particles  : Azimuthal angle from reaction plane JPS 2010 Autumn Meeting @ KYUTECH, Japan

  4. Detector Upgradefor Au+Au Run in RHIC-Year2007 • Muon Piston Calorimeter (MPC) • Rapidity coverage 3.1 < |h| < 3.7 • PbWO4 Crystals + Avalanche Photodiodes EMCAL MPC RXN RXN MPC 0 f coverage 2p • Reaction Plane Detector (RXN) • Rapidity coverage 1.5 < |h| < 2.8 • Pb + Scintillator, PMT EMCAL -3 -2 -1 η 1 2 3 MPC/RXN Acceptance View Reaction plane resolution Error is reduced ~80% Beam Beam Counter (BBC) : Reaction plane detector before RHIC-Year 2007 Similar rapidity coverage as MPC (3.0 < |h| < 3.9) JPS 2010 Autumn Meeting @ KYUTECH, Japan

  5. Improved Integrated Luminosity in RHIC-Year2007 Integrated Luminosity : 241mb-1(Run4)  813mb-1(Run7) For most of centrality classes, pT reach is extended up to 20GeV/c ! JPS 2010 Autumn Meeting @ KYUTECH, Japan

  6. pT dependence of p0 RAA(pT) – Published Paper and New Preliminary – JPS 2010 Autumn Meeting @ KYUTECH, Japan

  7. Centrality Dependence of p0 RAA(pT) and v2 ASW in pQCD ASW in AdS/CFT • Energy loss model • WHDG Calculation (pQCD ) • Only radiative process • CT Calculation (AdS/CFT) • only radiative process • JR Calculation (AdS/CFT) • Same as CT model • Initial geometry in JR Calc. • Color Glass Condensate (CGC)  Solid • Standard Glauber  Short dashed • Glauber including fluctuations  Long dashed arXiv:1006.3770 , PHENIX new published paper (Accepted in Phys.Rev.Lett.) • 3-D hydro + Energy loss in weakly/strongly coupled medium • Data ≈ RAA(AdS/CFT) ≈ RAA(pQCD) • v2 (AdS/CFT) > v2 (pQCD) JPS 2010 Autumn Meeting @ KYUTECH, Japan

  8. In-plane/Out-of-plane/Average p0 RAA(pT ,Df)– pTdependence – Gray band : RAA(pT) pT correlated Light blue band : Global syst.err. Bracket on data : RAA(pT, Df) pT uncorrelated Band on data : RAA(pT,Df) pT correlated Azimuthal angular dependence of RAA is clearly seen ! JPS 2010 Autumn Meeting @ KYUTECH, Japan

  9. Model Comparison with p0 RAA(pT ,Df) in Centrality 20-30% ASW in pQCD ASW in AdS/CFT Theoretical Curve: Phys.Rev.C79,024901(2009) Theoretical Curve : Phys.Lett.B685,270(2010) • Energy loss models in weakly coupled medium • Weakazimuthal angular dependence • Energy loss models in strongly coupled medium • Strongazimuthal angular dependence JPS 2010 Autumn Meeting @ KYUTECH, Japan

  10. Summary and Outlook • Jet Quenching (Hard scattered parton) • Good probe for studying the property of dense matter. • Sensitive to gluon density in the medium • Azimuthal Angular Dependence of RAA(pT, Df) • Out-of-plane RAA (i.e. Long path length) • Reproduce RAA for both cases of pQCD and AdS/CFT • In-plane RAA (i.e. Short path length) • Difference between pQCD and AdS/CFT models • Ongoing Work • Constrain the model parameters in the medium • Extract the path-length dependence of RAA • Probe the Nature of the Medium at LHC • Path-length dependence of RAA is a valid and powerful tool JPS 2010 Autumn Meeting @ KYUTECH, Japan

  11. Backup JPS 2010 Autumn Meeting @ KYUTECH, Japan

  12. Determination Error for Reaction plane Central Collision : ~ 10 % difference Mid-central Collision : ~ 5 % difference Peripheral Collision : ~ 10 % difference Systematic Error on v2 JPS 2010 Autumn Meeting @ KYUTECH, Japan

  13. Systematic Uncertainty Source on Integrated Angle RAA(pT) JPS 2010 Autumn Meeting @ KYUTECH, Japan

  14. p0 RAA(pT ,Df) in Au+Au – Run7 PHENIX Preliminary Gray band : RAA(pT) pT correlated .err. Light blue band : Global syst.err. Bars on data : RAA(pT,Df) pT uncorrelated err. Azimuthal angular dependence of RAA is clearly seen ! JPS 2010 Autumn Meeting @ KYUTECH, Japan

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