Analysis of azimuthal dependence at RHICPHENIX Shin Ichi

Analysis of azimuthal dependence at RHIC-PHENIX Shin. Ichi Esumi Univ. of Tsukuba Contents v 2 scaling of identified hadrons open charm and direct photon azimuthal correlation a way to get v 2 of jets azimuthal dependent HBT LBL 2005/May/20 Shin. Ichi Esumi, Univ. of Tsukuba 1

BBC/ZDC : centrality Dch/PC 1, 2, 3 : tracking Tof : hadron PID Rich : electron PID Emcal : electron/photon PID LBL 2005/May/20 Shin. Ichi Esumi, Univ. of Tsukuba 2

Beam-beam counter (BBC) |h|=3~4 64 pmts in each BBC charged particles Muon arm + Silicon multiplicity (MVD) endcap d. Nch/dh Reaction plane detectors in PHENIX MVD CNT BBC ZDC/ SMD -6 -3 0 3 collision point South 6 h North beam line two central arms (CNT) |h|<0. 35 Dch, PCs, TOF, EMCAL tracking, momentum, PID LBL 2005/May/20 Shin. Ichi Esumi, Univ. of Tsukuba Zero Degree Calorimeter Shower-Max Detector Spectator neutron energy Beam position 3

FBBC 1 -p vs FBBC 2 FSMD 1 -p vs FSMD 2 back-to-back directed plane FSMD-p vs FBBC spectator neutrons vs ps from participants are flowing opposite. [-p, p] F 2 BBC 1 vs F 2 BBC 2 F 2 MVD 1 vs F 2 MVD 2 F 2 BBC vs F 2 MVD elliptic plane [-p/2, p/2] LBL 2005/May/20 Shin. Ichi Esumi, Univ. of Tsukuba 4

62. 4 Ge. V Au+Au: preliminary 200 Ge. V Au+Au, charged p, K, p : PRL 91, 182301 (2003) v 2 /nquark p 0 : preliminary stat. error only sys. error <20% (62 Ge. V) 15% (200 Ge. V) p. T /nquark [Ge. V/c] LBL 2005/May/20 Shin. Ichi Esumi, Univ. of Tsukuba 5

minimum bias Au+Au at s. NN = 200 Ge. V Almost NO mass ordering PHENIX preliminary quark + hadron flow Similar effect from the time-difference is seen in v 2 SPS PHENIX preliminary early freeze-out some remaining mass ordering LBL 2005/May/20 Shin. Ichi Esumi, Univ. of Tsukuba Tfo 6

Hadronic cascade fails in magnitude (too small, it needs a big push from QGP), but it shows clear meson / baryon difference. LBL 2005/May/20 Shin. Ichi Esumi, Univ. of Tsukuba 7

hydro + jet Jets dominate the high p. T part of spectra. recombination + fragmentation And they (jets) are suppressed. v 2 PHENIX LBL 2005/May/20 STAR Shin. Ichi Esumi, Univ. of Tsukuba 8

What about charm quark? Converter method binary scaling vs suppression Nuclear modification factor PHENIX Preliminary Cocktail subtraction method RAA (2. 5<p. T<5. 0 Ge. V/c) LBL 2005/May/20 Shin. Ichi Esumi, Univ. of Tsukuba p. T (Ge. V/c) 9

nucl-ex/0502009 inclusive e+e- v 2 charmed e+e- v 2 If charm quarks also flow, charm quarks are thermalized and / or suppressed (interact with matter) similarly to the light quarks. LBL 2005/May/20 • charmed electron v 2 > 0 • rule out an extreme case, charm does not interact with QGP and fragment in vacuum into D meson • get charm quark v 2 with quark coalescence assumption STAR SQM 04 Shin. Ichi Esumi, Univ. of Tsukuba 10

Direct photons are enhanced w. r. t. p 0 production, but it’s just because p 0 is suppressed, and the direct photons are in fact binary scaled. Inclusive Single g Run 2 Au. Au 200 Ge. V PHENIX Preliminary LBL 2005/May/20 Shin. Ichi Esumi, Univ. of Tsukuba 11

Note : Inclusive photon = including all of the decay effect from hadrons , 200 Ge. V Au+Au phenix preliminary vertical bar : stat. error curves, gray box : sys. error , 200 Ge. V Au+Au phenix preliminary hand-written calculate hadronic (p 0, h, . . ) decay The difference here and the photons v 2 and g/p 0 ratio R (s/n) will give us subtract from inclusive photon v 2 a measure of direct g v 2. p. T [Ge. V/c] Direct/prompt photon v 2 = 0, thermal photon v 2>0, bremsstrahlung photon v 2 < 0, so let’s try to extract, I’ve tried. . . Alternatively g/p 0 ratio R can be measured by assuming v 2 g=0, I’ve tried, too. . . LBL 2005/May/20 Shin. Ichi Esumi, Univ. of Tsukuba 12

STAR : nucl-ex/0409033 non-flow reduced v 2{RP} v 2{2} PHENIX Preliminary Different ways to reduce non-flow correlation, v 2 w. r. t. SMD R. P. LBL 2005/May/20 Shin. Ichi Esumi, Univ. of Tsukuba 13

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 4 < p. T(trig. ) < 6 Ge. V/c Low p. T! LBL 2005/May/20 Shin. Ichi Esumi, Univ. of Tsukuba 14

Charged hadron-hadron azimuthal correlation Low p. T! Large modification of back-to-back jets Cherenkov-like radiation? ! LBL 2005/May/20 Shin. Ichi Esumi, Univ. of Tsukuba 15

leading parton hadrons Proof of the jet quenching and it’s at least one of sources of v 2 at high p. T Q: Are jets source of v 2? Q: Does reaction zone make flowing jets? in-plane pair in between STAR preliminary out-of-plane pair trigger particle in the selected angular window r. p. 20 -60% 4 < p. T(trig. ) < 6 Ge. V/c 2 Ge. V/c< p. T(asso. ) < p. T(trig. ) LBL 2005/May/20 track 1 - track 2| Shin. Ichi Esumi, Univ. of Tsukuba 16

real/mixed three curves are fixed by measured v 2 and resolution coalescence of jet-fragmentation could be one of the source of v 2 flow subtracted p. Ttrigger(h) 3 Ge. V/c (g) > 2 Ge. V/c 1< p. Tassociated(h) <2 Ge. V/c in-plane pair in between pair out-of-plane pair hg -- hh PHENIX preliminary 0 LBL 2005/May/20 D (rad) PHENIX preliminary p 0 D (rad) Shin. Ichi Esumi, Univ. of Tsukuba p 17

Trigger particles selected in- or out of plane 2<p. T<4 Ge. V/c 1<p. T<3 Ge. V/c 0<p. T<2 Ge. V/c simulation (v 2 only) LBL 2005/May/20 Associated particles in all phi 0<p. T<2 Ge. V/c 1<p. T<3 Ge. V/c 2<p. T<4 Ge. V/c v 2 0. 18 0 0 2 4 p. T (Ge. V/c) p. T dependence of v 2 p. T distribution Jets added realistic BBC r. p. resolution trigger particles in 6 bins over [0 - p/2] 0< -F<p/12 p/12< -F<p/6 p/6< -F<p/4 p/4< -F<p/3 p/3< -F<p 5/12< -F<p/2 |f. TRIG-f. ASSO| Shin. Ichi Esumi, Univ. of Tsukuba A, B are both fixed for f(x)=A(1+2 Bcos(2 x)) by <v 2>trig, <v 2>asso, <cos(2 F)>, bin size No fitting!! Phys. Rev. C 69 (2004) 021901 18

d. N/dp. T case study : flow+jets p. T v 2 0. 2 case 1 case 2 case 3 case 4 (v 2 jet=0) (v 2 jet=0. 08) (v 2 jet=0. 16) (v 2 jet=0. 24) flow 0. 1 inclusive jets 0. 0 0 LBL 2005/May/20 1 2 Shin. Ichi Esumi, Univ. of Tsukuba 3 4 p. T (Ge. V/c) 19

Trigger particles selected in- or out of plane (2<p. T<3 Ge. V/c 1<p. T<2 Ge. V/c 0<p. T<1 Ge. V/c) Associated particles in all phi (1<p. T<2 Ge. V/c) c 2 data-c 2 func 0. 03 0< -F<p/12 p/12< -F<p/6 p/6< -F<p/4 p/4< -F<p/3 p/3< -F<p 5/12 p 5/12< -F<p/2 case 1 (v 2 jet=0) case 2 case 3 case 4 jet=0. 08) jet=0. 16) (v 2 jet=0. 24) (v 2 0. 00 0. 06 0. 00 0. 10 0. 00 LBL 2005/May/20 0 D p Shin. Ichi Esumi, Univ. of Tsukuba 20

Trigger particles selected in- or out of plane (2<p. T<3 Ge. V/c 1<p. T<2 Ge. V/c 0<p. T<1 Ge. V/c) Associated particles in all phi (1<p. T<2 Ge. V/c) c 2 data-c 2 func case 3 (v 2 case 3 + v 4 jet=0. 16) (v 2 jet=0. 16) effect of v 4 (flow part) A realistic resolution for v 2 and v 4 with 2 nd moment BBC R. P. is needed. v 2 v 4 p. T (Ge. V/c) 0< -F<p/12 p/12< -F<p/6 p/6< -F<p/4 p/4< -F<p/3 p/3< -F<p 5/12 p 5/12< -F<p/2 0 D p LBL 2005/May/20 Shin. Ichi Esumi, Univ. of Tsukuba 21

Out-Ofplane B Reaction Plane Rside Rout • 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 ! LBL 2005/May/20 Shin. Ichi Esumi, Univ. of Tsukuba 22

geo. cross term geo. + time (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 LBL 2005/May/20 Shin. Ichi Esumi, Univ. of Tsukuba 23

Summary v 2 scaling of identified hadrons open charm and direct photon azimuthal correlation a way to get v 2 of jets azimuthal dependent HBT LBL 2005/May/20 Shin. Ichi Esumi, Univ. of Tsukuba 24

q_other<40 Me. V/c • Pairs are divided into 4 Δφbins (width=45 degree) qα(Ge. V/c) LBL 2005/May/20 Shin. Ichi Esumi, Univ. of Tsukuba 25