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Two particle  correlation measurements

Hard - Soft Interplay at RHIC relation between v 2 and jet-modification ShinIchi Esumi Univ. of Tsukuba to replace the following talk --- Bridging the soft and the hard at RHIC --- Jiangyong Jia. Two particle  correlation measurements. away side suppression

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Two particle  correlation measurements

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  1. Hard - Soft Interplay at RHICrelation between v2 and jet-modificationShinIchi Esumi Univ. of Tsukuba to replace the following talk --- Bridging the soft and the hard at RHIC --- Jiangyong Jia ShinIchi Esumi, Univ. of Tsukuba

  2. Two particle  correlation measurements away side suppression at relatively high pT away side modification at relatively low-middle pT ShinIchi Esumi, Univ. of Tsukuba

  3. Single particle RAA and v2 measurements various things are changing at low-middle pT region. ShinIchi Esumi, Univ. of Tsukuba

  4. near side (trigger direction) thin side mach-cone (shoulder region) ASSO-TRIG>0 ASSO-TRIG<0 away side (head region) mach-cone (shoulder region) ASSO-TRIG<0 thick side -p 0 p ASSO TRIG (1) geometrical (almond shaped) effect or (2) dynamical (elliptic expansion) effect ShinIchi Esumi, Univ. of Tsukuba

  5. (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% (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 strong preference of associate particle emission towards the in-plane direction s = Trig. R.P. [] (1) s=[-4,-3]/8 (8) s=[3,4]/8 out-of-plane trigger selection average PHENIX preliminary significant not significant compared with systematic errors Asso.Trig. (rad) ShinIchi Esumi, Univ. of Tsukuba

  6. QM09 STAR 200GeV Au+Au 20-60% (pTTrig=3~4GeV/c, pTAsso=1~1.5GeV/c, >0.7, Trig-R.P.<0) in-plane trigger selection out-of-plane trigger selection strong preference of associate particle emission towards the in-plane direction QM08 STAR STAR Preliminary 3<pTtrig<4, 1.5<pTtrig<2.0 GeV/c Ridge Jet ShinIchi Esumi, Univ. of Tsukuba

  7. (1) (8) (2) (7) (6) (3) (4) (5) (5) (4) (6) (3) (7) (2) (8) (1) Toy model simulation with flow + jet (strong R.P. dependence) random mixing with zero bias flow random mixing with min. bias flow NAsso (1~2 GeV/c) : soft : 8 hard : 1 x fJet x 1.25[1/trig] NTrig (2~4 GeV/c) : soft : 1 x (1-fJet) hard : 1 x fJet fJet : 0.25 v2Trig : 19.6% v2Asso : 13.1% (flow) : 13.6% (m.b.) : 14.9% (bias) : 25.5% (jet) ShinIchi Esumi, Univ. of Tsukuba

  8. Toy model simulation v2Asso : 13.1% (flow) : 13.6% (m.b.) : 14.9% (bias) : 25.5% (jet) random mixing with zero bias flow subtraction random mixing with min. bias flow subtraction qualitatively consistent with jet trigger biased v2 measurements ShinIchi Esumi, Univ. of Tsukuba

  9. no embedding 7GeV in-plane 7GeV out-of-plane 7GeV at 45 deg 7GeV at 45 deg mixed events with the same triggered (embedded) events Z.W.Lin, J.Jia, S. Mohapatra, S. Esumi AMPT(v1.25/v2.25 string melting) : Au+Au 200GeV b=7fm (with embedding option) no embedding 7GeV in-plane 7GeV out-of-plane 7GeV at 45 deg 7GeV at 45 deg ShinIchi Esumi, Univ. of Tsukuba

  10. no embedding 7GeV in-plane 7GeV out-of-plane 7GeV at 45 deg 7GeV at 45 deg mixed events without the triggered (embedded) events --- mixed events from min.bias events --- Z.W.Lin, J.Jia, S. Mohapatra, S. Esumi AMPT(v1.25/v2.25 string melting) : Au+Au 200GeV b=7fm (with embedding option) no embedding 7GeV in-plane 7GeV out-of-plane 7GeV at 45 deg 7GeV at 45 deg ShinIchi Esumi, Univ. of Tsukuba

  11. Summary and Outlook (in back-ups) (1) re-distribution of lost energy from jet quenching at low-middle pT (2) strong R.P. dependence of the Mach-cone/ridge shape strong preference of associate particle emission towards the in-plane (3) trigger particle bias in soft particle v2 can be understood qualitatively what would be the true v2 to be compared with hydro-model? (4) hard/soft coupling with transverse/longitudinal geometry/dynamics (5) controlled direction/depth bias with reconstructed jets ShinIchi Esumi, Univ. of Tsukuba

  12. forward-backward asymmetry left-right asymmetry y 0  x z Takahito Todoroki : session BB ShinIchi Esumi, Univ. of Tsukuba

  13. ,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 STAR Preliminary Jet (small R) trigger 0(hadron) trigger more and more surface bias given by energy loss Au+Au 0~10% QM09, M. Ploskon ShinIchi Esumi, Univ. of Tsukuba

  14. J-cal for LHC-ALICE experiment for back-to-back jets measurements ShinIchi Esumi, Univ. of Tsukuba

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