Hard Soft Interplay at RHIC relation between v

Hard - Soft Interplay at RHIC relation between v 2 and jet-modification Shin. Ichi Esumi Univ. of Tsukuba to replace the following talk --- Bridging the soft and the hard at RHIC --Jiangyong Jia 15/Oct/2009, DNP/JPS, Hawaii Shin. Ichi Esumi, Univ. of Tsukuba 1

Two particle correlation measurements away side suppression at relatively high p. T 15/Oct/2009, DNP/JPS, Hawaii away side modification at relatively low-middle p. T Shin. Ichi Esumi, Univ. of Tsukuba 2

Single particle RAA and v 2 measurements various things are changing at low-middle p. T region. 15/Oct/2009, DNP/JPS, Hawaii Shin. Ichi Esumi, Univ. of Tsukuba 3

1. (1) geometrical (almond shaped) effect 2. or (2) dynamical (elliptic expansion) effect ) on i t c ide ire s ar r d ne igge (tr thin side mach-co ne (shoulde r region) ASSO- TRIG >0 ide ion) s ay reg aw ad (he ASSO- TRIG<0 mach-cone (shoulder region) ASSO- TRIG<0 thick side 15/Oct/2009, DNP/JPS, Hawaii 0 ASSO TRIG Shin. Ichi Esumi, Univ. of Tsukuba 4

200 Ge. V Au+Au -> h-h (run 7) in-plane trigger selection (4) s=[-1, 0] /8 (5) s=[0, 1] /8 (p. TTrig=2~4 Ge. V/c, p. TAsso=1~2 Ge. V/c) mid-central : 20 -50% c 2(data) - c 2(flow) (1) out-of-plane trigger selection (3) s=[-2, -1] /8 (6) s=[1, 2] /8 (8) (2) in-plane associate regions (7) (3) (6) (4) (5) (4) (6) (2) s=[-3, -2] /8 (7) s=[2, 3] /8 (1) s=[-4, -3] /8 (8) s=[3, 4] /8 in-plane (3) (7) (2) (8) strong preference of associate particle emission towards the in-plane direction (1) s = Trig. R. P. [ ] average PHENIX preliminary significant Asso. Trig. (rad) 15/Oct/2009, DNP/JPS, Hawaii not significant compared with systematic errors Shin. Ichi Esumi, Univ. of Tsukuba 5

QM 09 STAR 200 Ge. V Au+Au 20 -60% (p. TTrig=3~4 Ge. V/c, p. TAsso=1~1. 5 Ge. V/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 QM 08 STAR 3<p. Ttrig<4, 1. 5<p. Ttrig<2. 0 Ge. V/c Ridge STAR Preliminary Jet 15/Oct/2009, DNP/JPS, Hawaii Shin. Ichi Esumi, Univ. of Tsukuba 6

Toy model simulation with flow + jet (strong R. P. dependence) random mixing with min. bias flow random mixing with zero bias flow NAsso (1~2 Ge. V/c) : soft : 8 hard : 1 x f. Jet x 1. 25[1/trig] NTrig (2~4 Ge. V/c) : soft : 1 x (1 -f. Jet) hard : 1 x f. Jet : 0. 25 v 2 Trig : 19. 6% v 2 Asso : 13. 1% (flow) : 13. 6% (m. b. ) : 14. 9% (bias) : 25. 5% (jet) (1) (8) (2) (7) (6) (3) (4) (5) (4) (6) (3) (7) (2) (8) (1) 15/Oct/2009, DNP/JPS, Hawaii Shin. Ichi Esumi, Univ. of Tsukuba 7

v 2 Asso : 13. 1% (flow) : 13. 6% (m. b. ) : 14. 9% (bias) : 25. 5% (jet) Toy model simulation random mixing with min. bias flow subtraction random mixing with zero bias flow subtraction qualitatively consistent with jet trigger biased v 2 measurements 15/Oct/2009, DNP/JPS, Hawaii Shin. Ichi Esumi, Univ. of Tsukuba 8

AMPT(v 1. 25/v 2. 25 string melting) : Au+Au 200 Ge. V b=7 fm (with embedding option) no embedding 7 Ge. V in-plane 7 Ge. V out-of-plane 7 Ge. V at 45 deg Z. W. Lin, J. Jia, S. Mohapatra, S. Esumi 7 Ge. V at 45 deg mixed events with the same triggered (embedded) events 15/Oct/2009, DNP/JPS, Hawaii Shin. Ichi Esumi, Univ. of Tsukuba 9

AMPT(v 1. 25/v 2. 25 string melting) : Au+Au 200 Ge. V b=7 fm (with embedding option) no embedding 7 Ge. V in-plane 7 Ge. V out-of-plane 7 Ge. V at 45 deg Z. W. Lin, J. Jia, S. Mohapatra, S. Esumi 7 Ge. V at 45 deg mixed events without the triggered (embedded) events --- mixed events from min. bias events --15/Oct/2009, DNP/JPS, Hawaii Shin. Ichi Esumi, Univ. of Tsukuba 10

Summary and Outlook (in back-ups) (1) re-distribution of lost energy from jet quenching at low-middle p. T (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 v 2 can be understood qualitatively what would be the true v 2 to be compared with hydro-model? (4) hard/soft coupling with transverse/longitudinal geometry/dynamics (5) controlled direction/depth bias with reconstructed jets 15/Oct/2009, DNP/JPS, Hawaii Shin. Ichi Esumi, Univ. of Tsukuba 11

forward-backward asymmetry 0 left-right asymmetry y x z Takahito Todoroki : session BB 15/Oct/2009, DNP/JPS, Hawaii Shin. Ichi Esumi, Univ. of Tsukuba 12

, Jet, 0 - hadron correlation RHIC-AGS’ 09, Y. S. Lai Comparisons are the most important! r to rgy e s clo n ene d an arto r e r s ial p o l ge C init g i tr a the mm a er G g g i ) tr R rge a l t( Je er g trig ) ll R a (sm t r Je ge g i ) tr n dro ias a b 0 (h ace f r su s e r o y los m nd nerg a e re mo en by giv 15/Oct/2009, DNP/JPS, Hawaii STAR Preliminary Au+Au 0~10% QM 09, M. Ploskon Shin. Ichi Esumi, Univ. of Tsukuba 13

J-cal for LHC-ALICE experiment for back-to-back jets measurements 15/Oct/2009, DNP/JPS, Hawaii Shin. Ichi Esumi, Univ. of Tsukuba 14