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Interplay between jet and v 2

Interplay between jet and v 2. ShinIchi Esumi Inst. of Physics, Univ. of Tsukuba measurements and simulations. jet. p. p. Au. Au. RHIC 200GeV. RHIC 62GeV. SPS 17GeV. PHENIX nucl-ex/0611019. S.Kniege, ISMD 2007. Jet suppression modification with 2-particle  correlation.

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Interplay between jet and v 2

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  1. Interplay between jet and v2 ShinIchi Esumi Inst. of Physics, Univ. of Tsukuba measurements and simulations ShinIchi Esumi, Univ. of Tsukuba

  2. jet p p Au Au RHIC 200GeV RHIC 62GeV SPS 17GeV PHENIX nucl-ex/0611019 S.Kniege, ISMD 2007 Jet suppression modification with 2-particle  correlation ShinIchi Esumi, Univ. of Tsukuba

  3. Jet modification and geometry (and v2) QM04: STAR QM08: STAR, PHENIX STAR Mach-cone shape depends on R.P. angle. Mach-cone is a source of of v2 3<pTtrig<4GeV/c & 1.0<pTasso<1.5GeV/c 20-60%  = associate - trigger (rad) ShinIchi Esumi, Univ. of Tsukuba

  4. out-of-pl. in-pl. in-pl. out-of-pl. ASSO.-TRIG. < 0 ASSO.-TRIG. > 0 ShinIchi Esumi, Univ. of Tsukuba

  5. (1) (8) (2) (7) (3) (6) (4) (5) (5) (4) (6) (3) (7) (2) (8) (1) (5) (4) (6) (3) (7) (2) (8) (1) Simulation Study trigger particle ASSO TRIG ) > 0 (5) (4) (6) (3) (7) (2) (8) (1) ASSO TRIG ) < 0 ASSO TRIG (rad) shape(1) = f1(x) shape(2) = f2(x) shape(3) = f3(x) shape(4) = f4(x) shape(5) = f5(x) =f4(-x) shape(6) = f6(x) =f3(-x) shape(7) = f7(x) =f2(-x) shape(8) = f8(x) = f1(-x) ASSO TRIG (rad) ShinIchi Esumi, Univ. of Tsukuba

  6. (1) (8) (2) (7) (3) (6) in-plane (4) (5) (5) (4) (6) (3) (7) (2) (8) (1) Simulation trigger angle selection among (1) - (8) regions * two different ways of mixing (top: r.p. random, bottom: r.p. aligned) * flow subtraction (two components flow+jet model, with inclusive flow measurement, with zyam-like normalization) (5) (4) (6) (3) (7) (2) (8) (1) two-particle correlation in-plane out-of-plane ASSO TRIG (rad) ShinIchi Esumi, Univ. of Tsukuba

  7. (1) (8) (2) (7) (3) (6) in-plane (4) (5) (5) (4) (6) (3) (7) (2) (8) (1) Simulation trigger angle selection among (1) - (8) regions top : left-right separated trigger w.r.t. R.P. bottom : left-right non-separated line : average of all (1) - (8) with experimental E.P. resolution ~0.7 (3) (6) (4) (5) (2) (7) (1) (8) flow-subtracted correlation in-plane out-of-plane (3) + (6) (4) + (5) (2) + (7) (1) + (8) ASSO TRIG (rad) ShinIchi Esumi, Univ. of Tsukuba

  8. (1) (8) (2) (7) (3) (6) in-plane (4) (5) (5) (4) (6) (3) (7) (2) (8) (1) Simulation trigger angle selection among (1) - (8) regions top : left-right separated trigger w.r.t. R.P. bottom : left-right non-separated line : average of all (1) - (8) with true R.P. (resolution = 1.0) (3) (6) (4) (5) (2) (7) (1) (8) flow-subtracted correlation in-plane out-of-plane (3) + (6) (4) + (5) (2) + (7) (1) + (8) ASSO TRIG (rad) ShinIchi Esumi, Univ. of Tsukuba

  9. Simulation in-plane out-of-plane flow-subtracted correlation no R.P. dependence on jet shape (This will be a pure non-flow.) ASSO TRIG (rad) ShinIchi Esumi, Univ. of Tsukuba

  10. RHIC 200GeV Au+Au, mid-central collisions at mid-pT region (1-4 GeV/c) with v2 = 0.1 ~ 0.2 * Significant semi-hard (mini-jet) fraction relative to soft-thermal contribution ~ several*10% * Significant v2 effect from the semi-hard component relative to soft-thermal particle v2 ~ several*10% * Significant smearing on jet shape even with R.P.~ 0.7 But it’s not really because of poor accuracy of E.P. angle, it’s more because mini-jets push up the inclusive v2 which is subtracted. * RHIC data analysis is in progress… * E.P. can also be biased by correlated pair even with large  gap… ShinIchi Esumi, Univ. of Tsukuba

  11. Au+Au, 200 GeV “jet” PYTHIA p+p STAR Ridge Dh Df(rad) Dh Df(rad) away side (in d) of one di-jet can be near side (in d) of another di-jet QM08 STAR 3<pTtrig<4, 1.5<pTtrig<2.0 GeV/c Ridge Jet does not depends on it Jet reduces v2 Ridge shape depends on R.P. angle. Ridge is a source of of v2 STAR Preliminary Jet ShinIchi Esumi, Univ. of Tsukuba

  12. trigger y Df away side near side x PYTHIA p+p away side of a back-to-back(b-t-b) jet is wider in  than in  If there are two parallel b-t-b jets, away side of one b-t-b jet can be near side of the another b-t-b jet. Suppression as well as modification of b-t-b jet would depend on relative angle w.r.t. almond geometry, we know this from v2 measurement and believe this is the major source of v2 at high pT . Therefore, there should be inter b-t-b jets correlation give by the geometry from (3), this could make near side ridge like effect, especially if the effect (3) has shaper dependence than v2(=cos2x). We always measure inclusive v2, which includes the effect (3). Therefore any modification which could generates the elliptic anisotropy would be included in the measured v2 . We subtract BG contribution with this v2 from (5) by maximizing BG contribution assuming zero jet yield at minimum at any d. If near and away side jets overlap each other, this subtraction underestimates the jet yield and can change the extracted jet shape. If you extract angular dependence of jet w.r.t. R.P., the results will easily be affected by the choice of v2 from (5). Dh Df(rad) ShinIchi Esumi, Univ. of Tsukuba

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