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Analysis of azimuthal dependence at RHIC-PHENIX

Study on scaling, correlations, and tracking of identified hadrons, open charm, and direct photons at RHIC-PHENIX experiment led by ShinIchi Esumi from the University of Tsukuba. Investigates jets' v2 and HBT with various detectors. Analysis includes centrality, collision points, and jet characteristics. Preliminary findings on charm quarks, hadron flow, and jet suppression are presented.

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Analysis of azimuthal dependence at RHIC-PHENIX

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  1. Analysis of azimuthal dependence at RHIC-PHENIX ShinIchi Esumi Univ. of Tsukuba Contents v2 scaling of identified hadrons open charm and direct photon azimuthal correlation a way to get v2 of jets azimuthal dependent HBT ShinIchi Esumi, Univ. of Tsukuba

  2. BBC/ZDC : centrality Dch/PC1,2,3 : tracking Tof : hadron PID Rich : electron PID Emcal : electron/photon PID ShinIchi Esumi, Univ. of Tsukuba

  3. dNch/dh -6 -3 0 3 6 h Reaction plane detectors in PHENIX CNT Beam-beam counter (BBC) |h|=3~4 64pmts in each BBC charged particles Muon arm + Silicon multiplicity (MVD) endcap MVD BBC ZDC/ SMD collision point South North beam line Zero Degree Calorimeter Shower-Max Detector Spectator neutron energy Beam position two central arms (CNT) |h|<0.35 Dch,PCs,TOF,EMCAL tracking, momentum, PID ShinIchi Esumi, Univ. of Tsukuba

  4. 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

  5. 62.4 GeV Au+Au: preliminary 200 GeV Au+Au, charged p,K,p : PRL91, 182301 (2003) p0 : preliminary v2 /nquark stat. error only sys. error <20% (62GeV) 15% (200GeV) pT /nquark [GeV/c] ShinIchi Esumi, Univ. of Tsukuba

  6. minimum bias Au+Au at sNN = 200 GeV Almost NO mass ordering PHENIX preliminary Similar effect from the time-difference is seen in v2 quark + hadron flow SPS PHENIX preliminary early freeze-out some remaining mass ordering Tfo ShinIchi Esumi, Univ. of Tsukuba

  7. Hadronic cascade fails in magnitude (too small, it needs a big push from QGP), but it shows clear meson / baryon difference. ShinIchi Esumi, Univ. of Tsukuba

  8. hydro + jet recombination + fragmentation Jets dominate the high pT part of spectra. And they (jets) are suppressed. v2 PHENIX STAR ShinIchi Esumi, Univ. of Tsukuba

  9. What about charm quark? Converter method binary scaling vs suppression PHENIX Preliminary Nuclear modification factor Cocktail subtraction method pT (GeV/c) RAA (2.5<pT<5.0 GeV/c) ShinIchi Esumi, Univ. of Tsukuba

  10. nucl-ex/0502009 inclusive e+e- v2 charmed e+e- v2 • charmed electron v2 > 0 • rule out an extreme case, charm does not interact with QGP and fragment in vacuum into D meson • get charm quark v2 with quark coalescence assumption If charm quarks also flow, charm quarks are thermalized and / or suppressed (interact with matter) similarly to the light quarks. STAR SQM04 ShinIchi Esumi, Univ. of Tsukuba

  11. Inclusive Single g Run2 AuAu 200 GeV PHENIX Preliminary Direct photons are enhanced w.r.t. p0 production, but it’s just because p0 is suppressed, and the direct photons are in fact binary scaled. ShinIchi Esumi, Univ. of Tsukuba

  12. vertical bar : stat. error curves, gray box : sys. error Note : Inclusive photon = including all of the decay effect from hadrons , 200 GeV Au+Au , 200 GeV Au+Au , 200 GeV Au+Au phenix preliminary phenix preliminary phenix preliminary hand-written calculate hadronic (p0,h,..) decay photons v2 and subtract from inclusive photon v2 The difference here and the g/p0 ratio R (s/n) will give us a measure of direct g v2. pT [GeV/c] Direct/prompt photon v2 = 0, thermal photon v2>0, bremsstrahlung photon v2 < 0, so let’s try to extract, I’ve tried... Alternatively g/p0 ratio R can be measured by assuming v2g=0, I’ve tried, too... ShinIchi Esumi, Univ. of Tsukuba

  13. STAR : nucl-ex/0409033 non-flow reduced v2{RP} v2{2} PHENIX Preliminary Different ways to reduce non-flow correlation, v2 w.r.t. SMD R.P. ShinIchi Esumi, Univ. of Tsukuba

  14. 4 < pT(trig.) < 6 GeV/c Charged hadron-hadron azimuthalcorrelation Is the away-side jet-like? Away-side looks jet like in p+p,but not in central Au+Au. nucl-ex/0404010 0501016 Low pT! ShinIchi Esumi, Univ. of Tsukuba

  15. Low pT! Charged hadron-hadron azimuthal correlation Large modification of back-to-back jets Cherenkov-like radiation?! ShinIchi Esumi, Univ. of Tsukuba

  16. in-plane pair STAR preliminary in between out-of-plane pair 20-60% trigger particle in the selected angular window r.p. track1 - track2| 20-60% Q: Are jets source of v2? Q: Does reaction zone make flowing jets? leading parton hadrons Proof of the jet quenching and it’s at least one of sources of v2 at high pT 4 < pT(trig.) < 6 GeV/c 2 GeV/c< pT(asso.) < pT(trig.) ShinIchi Esumi, Univ. of Tsukuba

  17. flow subtracted pTtrigger(g) > 2GeV/c 1< pTassociated(h) <2GeV/c in-plane pair in between pair out-of-plane pair g - h PHENIX preliminary PHENIX preliminary three curves are fixed by measured v2 and resolution coalescence of jet-fragmentation could be one of the source of v2 flow subtracted pTtrigger(h) > 3GeV/c 1< pTassociated(h) <2GeV/c in-plane pair in between pair out-of-plane pair h - h real/mixed PHENIX preliminary PHENIX preliminary 0 p 0 p Df (rad) Df (rad) ShinIchi Esumi, Univ. of Tsukuba

  18. Associated particles in all phi 0<pT<2 GeV/c 1<pT<3 GeV/c 2<pT<4 GeV/c v2 0.18 0 0 2 4 pT (GeV/c) Jets added simulation (v2 only) pT dependence of v2 pT distribution realistic BBC r.p. resolution trigger particles in 6 bins over [0 - p/2] 0<f-F<p/12 p/12<f-F<p/6 p/6<f-F<p/4 p/4<f-F<p/3 p/3<f-F<p5/12 p5/12<f-F<p/2 A,B are both fixed for f(x)=A(1+2Bcos(2x)) by <v2>trig,<v2>asso, <cos(2F)>, bin size No fitting!! Phys.Rev. C69 (2004) 021901 Trigger particles selected in- or out of plane 2<pT<4 GeV/c 1<pT<3 GeV/c 0<pT<2 GeV/c |fTRIG-fASSO| ShinIchi Esumi, Univ. of Tsukuba

  19. dN/dpT case study : flow+jets pT v2 case1 (v2jet=0) case2 (v2jet=0.08) case3 (v2jet=0.16) case4 (v2jet=0.24) 0.2 flow 0.1 inclusive jets 0.0 0 1 2 3 4 pT (GeV/c) ShinIchi Esumi, Univ. of Tsukuba

  20. c2data-c2func 0.03 case1 (v2jet=0) case2 (v2jet=0.08) case3 (v2jet=0.16) case4 (v2jet=0.24) 0.00 0.06 Associated particles in all phi (1<pT<2 GeV/c) Trigger particles selected in- or out of plane (2<pT<3 GeV/c 1<pT<2 GeV/c 0<pT<1 GeV/c) 0.00 0.10 0.00 0<f-F<p/12 p/12<f-F<p/6 p/6<f-F<p/4p/4<f-F<p/3 p/3<f-F<p5/12 p5/12<f-F<p/2 0 Df p ShinIchi Esumi, Univ. of Tsukuba

  21. c2data-c2func effect of v4 (flow part) case3 (v2jet=0.16) case3 + v4 (v2jet=0.16) A realistic resolution for v2 and v4 with 2nd moment BBC R.P. is needed. v2 Associated particles in all phi (1<pT<2 GeV/c) Trigger particles selected in- or out of plane (2<pT<3 GeV/c 1<pT<2 GeV/c 0<pT<1 GeV/c) v4 pT (GeV/c) 0<f-F<p/12 p/12<f-F<p/6 p/6<f-F<p/4p/4<f-F<p/3 p/3<f-F<p5/12 p5/12<f-F<p/2 0 Df p ShinIchi Esumi, Univ. of Tsukuba

  22. Out-Of-plane Rside B Rout Reaction Plane A In-plane Au Au • The correction for R.P was applied • Sinyukov’s fit • Fitting by cos and sin function expected tendencies of sin or cos are seen ! ShinIchi Esumi, Univ. of Tsukuba

  23. geo. geo. + time cross term (geo. + time)/geo. • Rs,2/Rs,0, Ro,2/Rs,0 and Ros,2/Rs,0 are larger at mid-central than at central. • Ro,2/Rs,0 , Ros,2/Rs,0 seem to be larger than Rs,2/Rs,0 • Rl,2/Rl,0 and the difference (Ro,2/Rs,0 - Rs,2/Rs,0 ) seem to be possitive? • anisotropy in geometry or (maybe more) in time/expansion ShinIchi Esumi, Univ. of Tsukuba

  24. Summary v2 scaling of identified hadrons open charm and direct photon azimuthal correlation a way to get v2 of jets azimuthal dependent HBT ShinIchi Esumi, Univ. of Tsukuba

  25. Pairs are divided into 4 Δφbins (width=45degree) q_other<40MeV/c qα(GeV/c) ShinIchi Esumi, Univ. of Tsukuba

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