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Yoki Aramaki, for the PHENIX Collaboration Center for Nuclear Study, University of Tokyo.

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Presentation on theme: "Yoki Aramaki, for the PHENIX Collaboration Center for Nuclear Study, University of Tokyo."— Presentation transcript:

1 Yoki Aramaki, for the PHENIX Collaboration Center for Nuclear Study, University of Tokyo

2 (Ex. Phys.Lett.B685(2010)270)  Observation of Jet Quenching Yield Suppression at high p T (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  Jet Quenching as Observable Sensitive to the density of the medium Test for the nature of the medium (Strong or Weak coupled?) 2010/09/13 1/9 JPS 2010 Autumn Meeting @ KYUTECH, Japan

3 x z  Role of Anisotropy v 2 at High p T  : Azimuthal angle of emitted particles  : Azimuthal angle from reaction plane  Correspondence Relation Path length (L) ↔ Azimuthal angle (  ) and Centrality  Extraction of R AA (p T,  ) R AA (p T, L) ↔ R AA (p T, centrality,  ) Light blue : long path length Red : short path length  Spatial anisotropy in non-central collisions influences R AA for each azimuthal angle. 2010/09/13 2/9 JPS 2010 Autumn Meeting @ KYUTECH, Japan

4  Muon Piston Calorimeter (MPC) Rapidity coverage 3.1 < |  | < 3.7 PbWO4 Crystals + Avalanche Photodiodes MPC/RXN Acceptance View MPC  coverage 2  EMCAL Reaction plane resolution -3 -2 -1 η 1 2 3 Error is reduced ~80% Beam Beam Counter (BBC) : Reaction plane detector before RHIC-Year 2007 Similar rapidity coverage as MPC (3.0 < |  | < 3.9)  Reaction Plane Detector (RXN) Rapidity coverage 1.5 < |  | < 2.8 Pb + Scintillator, PMT RXN 2010/09/13 3/9 JPS 2010 Autumn Meeting @ KYUTECH, Japan

5 Integrated Luminosity : 241  b -1 (Run4)  813  b -1 (Run7) For most of centrality classes, pT reach is extended up to 20GeV/c ! 2010/09/13 4/9 JPS 2010 Autumn Meeting @ KYUTECH, Japan

6 2010/09/13 5/9 JPS 2010 Autumn Meeting @ KYUTECH, Japan

7  Energy loss model  3-D hydro + Energy loss in weakly/strongly coupled medium Data ≈ R AA (AdS/CFT) ≈ R AA (pQCD) v 2 (AdS/CFT) > v 2 (pQCD)  Color Glass Condensate (CGC)  Solid  Standard Glauber  Short dashed  Glauber including fluctuations  Long dashed  Initial geometry in JR Calc.  arXiv:1006.3770, PHENIX new published paper (Accepted in Phys.Rev.Lett.)  WHDG Calculation (pQCD ) Only radiative process  CT Calculation (AdS/CFT) only radiative process  JR Calculation (AdS/CFT) Same as CT model ASW in pQCDASW in AdS/CFT 2010/09/13 6/9 JPS 2010 Autumn Meeting @ KYUTECH, Japan

8 Gray band : R AA (p T ) p T correlated Light blue band : Global syst.err. Band on data : R AA (p T,  ) p T correlated Bracket on data : R AA (p T,  ) p T uncorrelated Azimuthal angular dependence of R AA is clearly seen ! 2010/09/13 7/9 JPS 2010 Autumn Meeting @ KYUTECH, Japan

9  Energy loss models in weakly coupled medium Weak azimuthal angular dependence  Energy loss models in strongly coupled medium Strong azimuthal angular dependence ASW in pQCDASW in AdS/CFT Theoretical Curve: Phys.Rev.C79,024901(2009) Theoretical Curve : Phys.Lett.B685,270(2010) 2010/09/13 8/9 JPS 2010 Autumn Meeting @ KYUTECH, Japan

10  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 R AA (p T,  ) Out-of-plane R AA (i.e. Long path length) Reproduce R AA for both cases of pQCD and AdS/CFT In-plane R AA (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 R AA  Probe the Nature of the Medium at LHC Path-length dependence of R AA is a valid and powerful tool 2010/09/13 9/9 JPS 2010 Autumn Meeting @ KYUTECH, Japan

11 2010/09/13 10/9 JPS 2010 Autumn Meeting @ KYUTECH, Japan

12 Central Collision : ~ 10 % difference Mid-central Collision : ~ 5 % difference Peripheral Collision : ~ 10 % difference Systematic Error on v 2 2010/09/13 11/9 JPS 2010 Autumn Meeting @ KYUTECH, Japan

13 2010/09/13 12/9 JPS 2010 Autumn Meeting @ KYUTECH, Japan

14 Gray band : R AA (p T ) p T correlated.err. Light blue band : Global syst.err. Bars on data : R AA (p T,  ) p T uncorrelated err. Azimuthal angular dependence of R AA is clearly seen ! 2010/09/13 13/9 JPS 2010 Autumn Meeting @ KYUTECH, Japan

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