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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 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
BBC/ZDC : centrality Dch/PC1,2,3 : tracking Tof : hadron PID Rich : electron PID Emcal : electron/photon PID ShinIchi Esumi, Univ. of Tsukuba
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
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
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
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
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
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
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
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
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
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
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
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
Low pT! Charged hadron-hadron azimuthal correlation Large modification of back-to-back jets Cherenkov-like radiation?! ShinIchi Esumi, Univ. of Tsukuba
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
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
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
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
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
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
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
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
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
Pairs are divided into 4 Δφbins (width=45degree) q_other<40MeV/c qα(GeV/c) ShinIchi Esumi, Univ. of Tsukuba