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flow workshop, BNLShinIchi Esumi, Tsukuba1 Charged particle v2 and azimuthal pair correlation with respect to the reaction plane at PHENIX ShinIchi Esumi for the PHENIX collaboration Univ. of Tsukuba v2 from r.p. and pair correlation pair correlation with r.p. my toy simulation identified particle v2 summary

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flow workshop, BNLShinIchi Esumi, Tsukuba2 r.p. Reaction plane parton hadrons p+p collisionA+A collision r.p. for a geometrical origin suffer r.p. resolution (smeared shape) dN/d( - ) = N (1 + 2v n ’ cos(n( - ))) no smearing (detailed shape analysis) event anisotropy shape (no relation to r.p.) N real ( )/N mixed ( ) = N (1 + 2v n 2 cos(n( )))

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flow workshop, BNLShinIchi Esumi, Tsukuba3 track - true -> v2 track - measured -> v2*resolution track1 - track2 -> v2*v2 reduced correlation because of v2*v2, but smaller error bar because of a large pair combination simulation close to pure 1+cos func. fine structure in d distri.

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flow workshop, BNLShinIchi Esumi, Tsukuba4 inside a jet (d) flow + flow&jets + cross jets (a) (b) (c) flow+jets track1 - track2 Parameters n f : flow particles n j : # of jet axis with v 2ja n p : # of particle per jet v 2f : v 2 of n f v 2j : v 2 of n j n p Harmonic part : 1+2p*cos(d) (a) p=v 2f v 2f : n f (n f -1) (b) p=v 2f v 2j : n f n j n p (c) p=v 2j v 2j : n j (n j -1)n p 2 Jet shape : near+far side gauss (d) F(d) : n j n p (n p -1) Jet part (c)+(d) : n j n p (n j n p -1) (c) (d) v 2j =0v 2j >0 v 2ja =1 0 d (c) (d) (c) (d)

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flow workshop, BNLShinIchi Esumi, Tsukuba5 Models (hydro/recombination + jets/fragmentation) hydro+jetsrecomb.+fragm. hydro:v 2 hydro jets:v 2 jets sum my toy model p T (GeV/c) dn/dp T (arb. unit) (1) v 2 of soft hadrons (2) amount of Jets (3) v 2 of jets (energy loss+ almond shape)

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flow workshop, BNLShinIchi Esumi, Tsukuba6 v 2 hydro v 2 jets v 2 sum v 2 pair back-to-back jets like effect like (90deg) decay effect simulation r.p. based data

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flow workshop, BNLShinIchi Esumi, Tsukuba7 simulation v 2 hydro v 2 jets V 2 jets =0 reduced jets yield

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flow workshop, BNLShinIchi Esumi, Tsukuba8 simulation v 2 hydro +v 2 jets reaction plane based analysis pair wise correlation analysis No (90deg) like decay effect No (90deg) like decay effect + reduced v 2

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flow workshop, BNLShinIchi Esumi, Tsukuba9 leading parton hadrons Q: Are jets source of v2? Q: Does reaction zone make flowing jets? track1 - track2 | r.p. in-plane pair out-of-plane pair in between trigger particle in the selected angular window hydro:v 2 hydro jets:v 2 jets sum p T (GeV/c) dn/dp T (arb. unit)

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3GeV/c) hydro flow, flowing jets, like decay are included in the simulation as same as in the previous slide data PHENIX preliminary

11 flow workshop, BNLShinIchi Esumi, Tsukuba11 No flowing jets No flowing jets, reduced jets yield p T (trig)>3GeV/c 0

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3GeV/c 0

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flow workshop, BNLShinIchi Esumi, Tsukuba12 PHENIX preliminary

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flow workshop, BNLShinIchi Esumi, Tsukuba13 PHENIX preliminary

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flow workshop, BNLShinIchi Esumi, Tsukuba14 High p T initial v 2 =0energy lossfragmentation Low p T (1) (2)(3) (4) (1)-(2)hydro press. (5)(6) recombination/ hadronize/freeze-out time v 2 (high p T ) (1) (2) (3) time v 2 (low p T ) (4) (5) (6) chemical f.o. thermal f.o. phase transition

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flow workshop, BNLShinIchi Esumi, Tsukuba15 v2(p T ) pTpT 2~3GeV/c final state after f.o. initial state just after p.t. Yield,slope,v2 measurements on (1),k,p,d,, (2), (3)open charm, J (4) direct

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flow workshop, BNLShinIchi Esumi, Tsukuba16 quark flow plus hadron flow minimum bias Au+Au at s NN = 200 GeV PHENIX preliminary

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flow workshop, BNLShinIchi Esumi, Tsukuba17 v2(proton) v2(pion) v2(e) v 2 pion & v 2 proton : nucl-ex/0305013 (PHENIX) p t [GeV/c] v2 (M.B) conversion 0 ee ee, 3 0 ee, 0 ee ee, ee ee ’ ee electron v2 to measure charm quark v2

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flow workshop, BNLShinIchi Esumi, Tsukuba18 phenix preliminary

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flow workshop, BNLShinIchi Esumi, Tsukuba19 extraction of direct photon v2?! phenix preliminary direct / inclusive

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flow workshop, BNLShinIchi Esumi, Tsukuba20 Summary non-flow is not always additive jets seem to have v2 (not new) jet shape/yield w.r.t. reaction plane different identified particles v2

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TWO PARTICLE CORRELATION MEASUREMENTS AT PHENIX Takahito Todoroki For the PHENIX Collaboration University of Tsukuba & RIKEN Nishina Center Hard Probes.

TWO PARTICLE CORRELATION MEASUREMENTS AT PHENIX Takahito Todoroki For the PHENIX Collaboration University of Tsukuba & RIKEN Nishina Center Hard Probes.

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