Masashi Kaneta for the PHENIX collaboration Event anisotropy of identified p0, g and e compared to charged p, K, p, and d in sNN = 200 GeV Au+Au at PHENIX x z y Masashi Kaneta Masashi Kaneta for the PHENIX collaboration 15 sec Let me start event anisotropy talk from PHENIX about pi zero gamma and electron in 200 GeV Gold on Gold collisions.

12 Countries; 58 Institutions; 480 Participants* Brazil University of São Paulo, São Paulo China Academia Sinica, Taipei, Taiwan China Institute of Atomic Energy, Beijing Peking University, Beijing France LPC, University de Clermont-Ferrand, Clermont-Ferrand Dapnia, CEA Saclay, Gif-sur-Yvette IPN-Orsay, Universite Paris Sud, CNRS-IN2P3, Orsay LLR, Ecòle Polytechnique, CNRS-IN2P3, Palaiseau SUBATECH, Ecòle des Mines at Nantes, Nantes Germany University of Münster, Münster Hungary Central Research Institute for Physics (KFKI), Budapest Debrecen University, Debrecen Eötvös Loránd University (ELTE), Budapest India Banaras Hindu University, Banaras Bhabha Atomic Research Centre, Bombay Israel Weizmann Institute, Rehovot Japan Center for Nuclear Study, University of Tokyo, Tokyo Hiroshima University, Higashi-Hiroshima KEK, Institute for High Energy Physics, Tsukuba Kyoto University, Kyoto Nagasaki Institute of Applied Science, Nagasaki RIKEN, Institute for Physical and Chemical Research, Wako RIKEN-BNL Research Center, Upton, NY Rikkyo University, Tokyo Tokyo Institute of Technology, Tokyo University of Tsukuba, Tsukuba Waseda University, Tokyo S. Korea Cyclotron Application Laboratory, KAERI, Seoul Kangnung National University, Kangnung Korea University, Seoul Myong Ji University, Yongin City System Electronics Laboratory, Seoul Nat. University, Seoul Yonsei University, Seoul Russia Institute of High Energy Physics, Protovino Joint Institute for Nuclear Research, Dubna Kurchatov Institute, Moscow PNPI, St. Petersburg Nuclear Physics Institute, St. Petersburg St. Petersburg State Technical University, St. Petersburg Sweden Lund University, Lund 12 Countries; 58 Institutions; 480 Participants* USA Abilene Christian University, Abilene, TX Brookhaven National Laboratory, Upton, NY University of California - Riverside, Riverside, CA University of Colorado, Boulder, CO Columbia University, Nevis Laboratories, Irvington, NY Florida State University, Tallahassee, FL Florida Technical University, Melbourne, FL Georgia State University, Atlanta, GA University of Illinois Urbana Champaign, Urbana-Champaign, IL Iowa State University and Ames Laboratory, Ames, IA Los Alamos National Laboratory, Los Alamos, NM Lawrence Livermore National Laboratory, Livermore, Ca University of New Mexico, Albuquerque, NM New Mexico State University, Las Cruces, NM Dept. of Chemistry, Stony Brook Univ., Stony Brook, NY Dept. Phys. and Astronomy, Stony Brook Univ., Stony Brook, NY Oak Ridge National Laboratory, Oak Ridge, TN University of Tennessee, Knoxville, TN Vanderbilt University, Nashville, TN 10 sec This is the PHENIX collaboration from 12 countries, 58 institutions and 480 participants. *as of January 2004 Masashi Kaneta, RBRC, BNL

Announcement * Students The flow and event anisotropy from the PHENIX collaborators in the poster session Shingo Sakai* Azimuthal anisotropy of electrons/positrons in 200 GeV Au+Au collisions at RHIC-PHENIX Andrey Kazantsev* Elliptic flow of inclusive photons in Au+Au collisions at sNN=200 GeV from the PHENIX experiment at RHIC Hiroshi Masui* Measurement of directed flow in sNN=200 GeV Au+Au, d+Au, p+p collisions at RHIC-PHENIX Akio Kiyomichi Radial flow study from identified hadron spectra in Au+Au collisions at sNN=200 GeV (at PHENIX) Michael Issah* Azimuthal anisotropy measurements in PHENIX via cummulants of Multiparticle azimuthal correlations Debsankar Mukhopadhyay Elliptic flow of f mesons in Au+Au collisions at sNN=200 GeV (at PHENIX) ShinIchi Esumi Analysis of event anisotropy and azimuthal pair correlation 20 sec Before start of my talk, I want to mention PHENIX poster related flow and event anisotropy. The names colored by red are students. It is not too late to go to poster session to read it. Please go the poster session and talk with those students, especially. * Students Masashi Kaneta, RBRC, BNL

Motivations Event anisotropy p0 Photon Electron/positron Sensitive to the initial state Collectivity of hadron/parton  thermalization / recombination Energy loss by Jet quenching  dense matter p0 Large pT coverage as an identified hadron Large contribution of the decay to the following inclusive measurements Photon Radiation / Compton from hot gas Photon flow? Electron/positron Open charm and bottom Flow and energy loss of heavy flavors? 90 sec We are interested in event anisotropy. It is one of reasons why you are here. OK? The event anisotropy is sensitive to the initial state. In the low pT region, we see collectivity of hadron and parton, and it relate to thermalization and recombination in the early stage. And the energy loss by jet quenching is also important to find an evidence of dense matter, that is, QGP. This talk focuses on pi0, photon, and electrons. pi0 is good observable as identified hadron because technically the pT coverage in larger than the other hadrons. And it makes large contribution of the decay to the photon and electrons yields. We can have early stage of information by photon due to small cross section. We don’t know whether photon flow exist, but if there is, it is interesting. Our goal of electron analysis is for the open charm and bottom measurement. It is interesting to see flow and energy loss of heavy flavors. p+ Masashi Kaneta, RBRC, BNL

The PHENIX experiment at RHIC Photons/p0 Tracking : vertex be BBC to EMC hit positions PID : EMCal PHOENIX Electrons Tracking DC, PC hits, vertex by BBC PID RICH (pT<4.9 GeV/c) Energy/momentum cut by EMCal Event centrality BBC and ZDC 60 sec The phenix experiment is at RHIC where stay in New York, Long Islands. You can see the RHIC from the satellite. The PHENIX is here at RHIC. Photons pi0 are measured be Electro-Magnetic Calorimeters. Electron is identified by RICH detector and EMC. The event centrality is defined by Beam-Beam counters and Zero-Degree Calorimeter stay here The selection of centrality is like this in PHENIX. Masashi Kaneta, RBRC, BNL

Method of v2 Measurement reaction plane angle event anisotropy parameter measured azimuthal angle of the particle vnreal = vnmeasured/ (reaction plane resolution)n Note: the detail of reaction plane definition will be found in nucl-ex/0305013 Define reaction plane by charged multiplicity on Beam-Beam Counters Photons Obtained the second harmonic coefficient v2 from <cos[2(f-r)]> p0 p0 reconstruction and background subtract (combinatorial and the others) For each pT, azimuthal angle, centrality Combine both information Counting number of p0 as a function of f-r and fit by the formula Electrons Both methods are used The analysis of pi zero v2 is done as the following steps. The Reaction plane is defined by charged multiplicity on Beam-Beam counters. The pi zero is reconstructed by two photon measured by EMC. Both information are combined and we obtained pi zero distribution as a function of the following formula. Here, the cross section is describe pT, rapidity and Fourier expansion of phi minus reaction plane. The vn is event anisotropy parameter measured and it is smeared by uncertainty of reaction plane. It is corrected by reaction plane resolution. Masashi Kaneta, RBRC, BNL

Reaction plane definition North South 144.35 cm ⊿η = 3.1 ~ 4.0 ⊿φ = 2π inner ring middle ring outer ring North South 144.35 cm ⊿η = 3.1 ~ 4.0 ⊿φ = 2π 64 elements Quartz Cherenkov radiator meshed dynode PMT inner ring middle ring outer ring BBC - p /2 p/2 Correlation of reaction planes Masashi Kaneta, RBRC, BNL

g & p0 v2 3 sec let me start from gamma and pi0 v2 results.

Inclusive photon v2 and p0 v2 in 200 GeV Au+Au Note : Inclusive photon = including all of the decay effect from hadrons vertical bar : stat. error curves, gray box : sys. error , 200 GeV Au+Au , 200 GeV Au+Au , 200 GeV Au+Au phenix preliminary phenix preliminary phenix preliminary 90 sec Here is inclusive photon v2 and pi0 v2 as a function of pT for there centrality bins, top 20, 20-40, 40-60 %. You can see the both v2 are increasing with pT until around 3 GeV of pT, then saturated. The photon we measured is including hadron decays mainly pi0. For the our goal, we need to subtract the decay effect to see thermal and direct photon However, to see them, we need more statistics. pT [GeV/c] Inclusive photon v2 shows similar tendency with p0 Need more statistics to see photon v2 after p0 (and also h) decay effect subtraction Masashi Kaneta, RBRC, BNL

p0 decay effect for photon v2 (MC) Test 1 Test 2 v2 0.35 0.3 0.25 0.2 0.15 0.1 0.05 -0.05 p0 v2 for MC input p0 v2 generated g v2 from p0 decay 60 sec I said, we need more statistics. However, it is no reason to wait for starting the decay effect study until we have fine data. This is a result of the study. Assuming pi0 v2 as shown by solid line, we can generate pi0 and process decay effect in Monte-Carlo. The tool is ready, then once we have better statistics we can subtract the decay effect from inclusive photon. 0 1 2 3 4 5 0 1 2 3 4 5 pT [GeV/c] Tool is ready for the decay effect in photons Masashi Kaneta, RBRC, BNL

<v2> vs. centrality from 200 GeV Au+Au Npart 26 46 74 114 167 235 325 Npart 26 46 74 114 167 235 325 200 GeV Au+Au 200 GeV Au+Au phenix preliminary phenix preliminary Vertical bar : stat. error Gray Box : sys. error Masashi Kaneta, RBRC, BNL

v2 vs. pT vs. centrality from 200 GeV Au+Au Statistical error is shown by error bar Systematic error from p0 count method and reaction plane determination is shown by horizontal bar The data point stays at <pT> in the bin and horizontal bar shows the bin range The charged p and K v2 are shown only with statistical errors 200 GeV Au+Au phenix preliminary } nucl-ex/0305013 Charged meson v2 consistent with p0 v2 in pT<4 GeV/c Masashi Kaneta, RBRC, BNL

v2 vs. pT (Min. Bias) from 200 GeV Au+Au Identified particle v2 up to pT=10 GeV/c Consistent with charged pions 200 GeV Au+Au Min. Bias phenix preliminary }nucl-ex/0305013 Also Similar pT dependence with charged hadron v2 Low pT : consistent with hydrodynamical calculation High pT : interesting to compare to a jet quenching calculation/ fragmentation-recombination model Vertical bar : stat. error curves, Gray Box : sys. error The data point :at <pT> in the bin 36.3106 [events] = 5.3± [(mb)-1] 0.5 0.4 Masashi Kaneta, RBRC, BNL

v2 : Identified hadrons at mid-rapidity PHENIX p, K, p in nucl-ex/0305013 and they are consistent with STAR data PHENIX p0, d+d preliminary data STAR K0S , L+L in nucl-ex/0306007 200 GeV Au+Au Min. Bias Difference between meson and baryon Hydrodynamical picture can describe mass dependence of v2 Masashi Kaneta, RBRC, BNL

Coalescence picture It is established for the nuclei cross section 200 GeV Au+Au Min. Bias preliminary } nucl-ex/0305013 A : nuclear number P : momentum p = P/A BA : coalescence parameter Masashi Kaneta, RBRC, BNL

Quark coalescence? qqmeson, qqq(qqq)Baryon What data looks like? - - Phys. Rev. Lett. 91 (2003) 092301, D. Molnar and S.A. Voloshin qqmeson, qqq(qqq)Baryon What data looks like? - - - - 200 GeV Au+Au Min. Bias Non-strange and strange mesons and baryons seem to be merged around pT/nquark 1-3 GeV/c With more statistics, we may discuss precisely Masashi Kaneta, RBRC, BNL

e± v2

Non-photonic e± v2 Have a look of the poster for detail discussion Shingo Sakai Azimuthal Anisotropy of electrons/positrons in 200 GeV Au+Au Collisions at RHIC-PHENIX Takashi Hachiya Single Electrons From Semi-leptonic Decays of Heavy Flavor in Au+Au Collisions at sNN=200 GeV Non-photonic electron (sorry for jargon) means Measured electron minus background: hadron decay g conversion that is, charmed (+bottomed) electron we think 0 1 2 3 0.3 0.25 0.2 0.15 0.1 0.05 -0.05 -0.1 non-photonic electron v2 pT [GeV/c] The data point : on <pT> in the bin horizontal bar : RMS of dN/dpT Two scenarios in nucl-th/0312100 thermalized charm + transverse flow no re-interaction Data is consistent with both scenarios Masashi Kaneta, RBRC, BNL

Summary

Summary First measurement of p0, g, e v2 at RHIC p0 v2 g v2 e v2 Minimum bias data (pT =1-10 GeV/c) v2 at the highest pT from the identified particle analysis Non-zero p0 v2 up to pT ~8 GeV/c Charged p v2 consistent with p0 v2 in pT =1-3 GeV/c Quark coalescence picture seems to work from combining various hadron v2’s at RHIC g v2 Centrality (top 20, 20-40, 40-60%) and pT dependence (in pT <5 GeV/c) are consistent with p0 With more statistics from run4, we hope to reject the decay effect e v2 Minimum bias data (pT =0.4-3.0 GeV/c) Non-photonic e v2 is consistent with both models: charm flow and no-charm flow We can discuss more precisely with more data. Masashi Kaneta, RBRC, BNL

New results of charged hadron vn Have a look of the poster for detail discussion Hiroshi Masui Measurement of directed flow in sNN=200 GeV Au+Au, d+Au, p+p collisions at RHIC-PHENIX Elliptic Flow Directed Flow Masashi Kaneta, RBRC, BNL