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Event anisotropy in high-energy heavy-ion collisions at RHIC

Event anisotropy in high-energy heavy-ion collisions at RHIC ShinIchi Esumi Inst. of Physics, Univ. of Tsukuba elliptic flow and nuclear suppression factor identified hadron v 2

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Event anisotropy in high-energy heavy-ion collisions at RHIC

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  1. Event anisotropy in high-energy heavy-ion collisions at RHIC ShinIchi Esumi Inst. of Physics, Univ. of Tsukuba elliptic flow and nuclear suppression factor identified hadron v2 f v2/RAA(quark coalescence or hydro) electron v2/RAA(charm quark) inclusive g, p0 v2 (direct g v2/RAA) e (eccentricity) scaling jet correlation and v2 ShinIchi Esumi, Univ. of Tsukuba

  2. Σ wi*sin(ni) tan(nn) = x Σ wi*cos(ni) y z reaction plane angle : n Non-central Collisions x v2 initial collision geometry pressure/density gradient, radial/elliptic expansion final momentum anisotropy 2nd harmonic amplitude : v2 |fi-n| ShinIchi Esumi, Univ. of Tsukuba

  3. y x b yield (A+A) RAA , RCP relative yield in A+A collisions normalized by p+p yield times number of binary collisions R AA = <Ncoll> yield (p+p) yieldCentral / <Ncoll>Central R CP = yieldPeripheral / <Ncoll>Periheral Npart : number of participant participant scaling Ncoll : number of binary collision binary scaling x z 2x1=2 3x2=6 3x3=9 3x3=9 1x2=2 1x2=2 impact parameter : b 12 + 11 total 30 collisions total 23 participant nucleons spectators ShinIchi Esumi, Univ. of Tsukuba

  4. spectator directed R.P. Reaction plane detectors MVD SMD/ZDC BBC participant elliptic R.P. ShinIchi Esumi, Univ. of Tsukuba

  5. neutron spectator charged particles (pions) at mid h beam beam line reaction plane FBBC1-pvs FBBC2 FSMD1-pvs FSMD2 FSMD-pvs FBBC back-to-back back-to-back spectator neutrons vs ps from participants are flowing opposite. directed plane [-p,p] F2BBC1vs F2BBC2 F2MVD1vs F2MVD2 F2BBCvs F2MVD elliptic plane [-p/2,p/2] ShinIchi Esumi, Univ. of Tsukuba

  6. Identified hadron v2 hydro dynamic behavior at low pT baryon/meson difference at high pT QM05 PHENIX QM05 STAR ShinIchi Esumi, Univ. of Tsukuba

  7. f-meson v2 mass scaling or number of quark scaling?baryon/meson (number of quark) differencehydro dynamic behavior : mf-meson ~ mprotonearly hadronic freeze-out for multi-strangeness hadrons _ Ξ+Ξ Ω+Ω  _ QM05 PHENIX QM05 STAR need more data/beam ShinIchi Esumi, Univ. of Tsukuba

  8. Nuclear modification factor : RCP clear separation between baryon group / meson group including f,W,X as well as p,K,p ShinIchi Esumi, Univ. of Tsukuba

  9. Number of quark scaling of v2 rather good description above 1GeV/c in quark pT remaining mass dependence at lower pT region v2 is already formed during quark phase before hadronization additional hadronic flow might be there after hadronization QM05 PHENIX QM05 STAR ShinIchi Esumi, Univ. of Tsukuba

  10. non-photonic electron v2 is similar with other hadronsat low pT but smaller at higher pT region 4~5GeV/c photonic electron v2 originated from p0is above p0 v2 at low pT and similar to p0 v2 at high pT and subtracted already. Non-photonic electron (charm origin) RAA compared with p0 RAA Non-photonic electron is less suppressed compared with p0, but it is still a significant suppression RAA~ 0.3 at higher pT region 4~5GeV/c (1) q_hat = 0 GeV2/fm (4) dNg / dy = 1000 (2) q_hat = 4 GeV2/fm (3) q_hat = 14 GeV2/fm ShinIchi Esumi, Univ. of Tsukuba

  11. B. Zhang et al. nucl-th/0502056 non-photonic electron : charm (+beauty) RAA and v2 very significant suppression at higher pT some difference between experiments at higher pT almost same as p0 suppression above 5GeV/c which needs to be solved. D-meson flows (+ve v2), should determine charm v2 b contribution less suppression less interaction b contribution less flow less thermalized I’m very much looking forward to hearing following electron v2 talks!! ShinIchi Esumi, Univ. of Tsukuba

  12. Direct photons are not suppressed RAA is about 1.0 high pT, g/p0 ratio > 1 at high pT Direct photon contribution is significant at high pT and at central collisions compared to the inclusive photon yield from the known hadronic sources. ShinIchi Esumi, Univ. of Tsukuba

  13. inclusive g and p0 v2 v2 of direct photon gives complimentary information in understanding the origin of binary scaled direct photon production. Bresmsrahlung, because of larger energy loss v2 < 0 fragmentation in vacuum, from escapedpartonv2 > 0 nucl-ex/0508019 ShinIchi Esumi, Univ. of Tsukuba

  14. R v2inclusive g – v2b.g. v2b.g v2direct g = R = R – 1 v2inclusive g try to extract direct g v2 if v2direct g = 0 v2b.g. : expected g v2 from hadronic decays nucl-ex/0508019 ShinIchi Esumi, Univ. of Tsukuba

  15. inclusive g and p0 v2 QM05 : Phenix preliminary run4 0-10 % 10-20 % v2 p0 inclusive g 20-30 % 30-40 % 40-50 % 50-60 % 0 5 pT (GeV/c) 10 ShinIchi Esumi, Univ. of Tsukuba

  16. Low pT direct g can be extracted in a different way for both pT distribution and v2. better accuracy at low pT might be expected. ShinIchi Esumi, Univ. of Tsukuba

  17. dNch/dh scales with Npart for both Au+Au / Cu+Cu ShinIchi Esumi, Univ. of Tsukuba

  18. RAA scales with Npart for both Au+Au / Cu+Cu ShinIchi Esumi, Univ. of Tsukuba

  19. participant R.P. true R.P. v2 does NOT scale with Npart for obvious reason ----- Geometry ----- <v2> (|h|<2) RQMDv2.4 with true R.P. black : Au+Au red : Cu+Cu if use all participants to define its axis and its deformation, maximum auto-correlation in e definition? ShinIchi Esumi, Univ. of Tsukuba

  20. Participant eccentricity includes initial statistical fluctuation of e and its axis, while experimental v2 and reaction plane (from participants with the 2nd moment axis) includes all fluctuations until final particle productions. ShinIchi Esumi, Univ. of Tsukuba

  21. Au+Au Cu+Cu Si(Cu)+Au Npart. scaling Ncoll. scaling eecc. scaling Si + Au 238U + 238U Lesson from PHOBOS should also be considered when comparing between experiments especially for light system. The difference between 2nd and 4th order cumulant results differ especially for Cu+Cu. QM05 PHENIX QM05 STAR v2 RAA jet/HBT(R.P.) ShinIchi Esumi, Univ. of Tsukuba

  22. 1st moment R.P. (SMD/ZDC, BBC, FTPC) e of participant with axis from spectator : yet another e needed? Cu+Cu w.r.t. SMD/ZDC (spectator directed) R.P. needed, it can be different with participant elliptic R.P. ZDC/SMD spectator v1 Au +Au 200 GeV QM05 PHOBOS spectator directed R.P. STAR preliminary QM05 STAR participant elliptic R.P. ShinIchi Esumi, Univ. of Tsukuba

  23. We should not forget that hadronic cascade can generate apparent number of quark scaling without quark coalescence, although the magnitude of v2 is about a half of experimental data. ISMD 2005 UrQMD origin of this apparent scaling needs to be understood ShinIchi Esumi, Univ. of Tsukuba

  24. High pT away-side jet suppression softening of associated pT distribution modification of jet shape at mid-pT QM05 : Phenix preliminary ShinIchi Esumi, Univ. of Tsukuba

  25. re-appearance (escaped) of high pT back-to-back jet pT pT(assoc) > 2 GeV/c pT Au+Au, 0-5% STAR Preliminary ShinIchi Esumi, Univ. of Tsukuba

  26. re-appearance (escaped) of high pT back-to-back jet centrality PHENIX Preliminary STAR Preliminary 8 < pT(trig) < 15 GeV/c pT(assoc)>6 GeV system/centrality ShinIchi Esumi, Univ. of Tsukuba

  27. PHENIX preliminary jet shape w.r.t. R.P. source of v2 at high pT v4 effects need to be considered jet v2 = b.g.(thermal) v2 extract jet shape or jet v2 in-plane pair in between pair out-of-plane pair jet yield (a.u.) pTtrigger(h) > 3GeV/c 1< pTassociated(h) <2GeV/c PHENIX preliminary 0 p Df (rad) ShinIchi Esumi, Univ. of Tsukuba

  28. protonpionelectronphoton v2 RAA 1 0.1 0 0 pT pT jet shape 0 |Df| p 0 Summary identified particles, f, e+-, g v2 * partonic flow ? * heavy quark v2 ? * direct photon production ? Npart. , Ncoll. , eecc.scaling * test with asymmetric collisions ? jet correlation and v2 * jet shape w.r.t. R.P. or jet v2 ? ShinIchi Esumi, Univ. of Tsukuba

  29. ShinIchi Esumi, Univ. of Tsukuba

  30. ShinIchi Esumi, Univ. of Tsukuba

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