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Strangeness (and heavy flavor) at RHIC Recent Results from PHENIX

Strangeness (and heavy flavor) at RHIC. Strangeness (and heavy flavor) at RHIC Recent Results from PHENIX. Recent Results from PHENIX. Masashi Kaneta RIKEN-BNL Research Center for the PHENIX collaboration. Masashi Kaneta RIKEN-BNL Research Center. Outlook of this talk.

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Strangeness (and heavy flavor) at RHIC Recent Results from PHENIX

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  1. Strangeness (and heavy flavor) at RHIC Strangeness (and heavy flavor) at RHICRecent Resultsfrom PHENIX Recent Resultsfrom PHENIX Masashi Kaneta RIKEN-BNL Research Center for the PHENIX collaboration Masashi Kaneta RIKEN-BNL Research Center Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  2. Outlook of this talk • Recent results from PHENIX • Event anisotropy • 62.4GeV Au+Au : p, K, p, and p (comparing with 200GeV) • 200 GeV Au+Au : Heavy flavor electron • Single particle spectra of f • 200GeV d+Au and 200GeV Au+Au • Anti-Pentaquark search and capability of the other strangeness • 200GeV p+p, d+Au, and Au+Au • Heavy Flavor Results from PHENIX • See talk of H. Pereira (Saclay) on Sep. 17 (Fri) • PHENIX experiment • Future strangeness and heavy flavor measurement at PHENIX • Charged hadron identification at high pT: Aerogel Cherenkov Counter • Upgrade around vertex : Silicon Vertex, Hadron Blind Detector, TPC • Nosecone Calorimeter • Summary Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  3. 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 *as of January 2004 Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  4. PHENIX • Collision vertex and centrality • Beam-Beam Counters (BBC) • Zero Degree Calorimeters (ZDC) • Tracking of Charged particle • Drift Chambers (DC) • Pad Chambers (PC1, PC2, PC3) • p, K, p, d, ... ID by Time-Of-Flight • Start timing from BBC • Stop timing from • High resolution TOF detectors (TOF) • TOF from Lead Scintillator EMCal (PbSc) • Electron ID • Ring Image Cherenkov (RICH) detectors • EMCal (PbSc, PbGl) • Photon (p0, h, ...) • EMCal (PbSc, PbGl) • Muon • Muon Tracker (MuTr) • Cathode-strip readout chamber • Muon Identifier (MuID) • Streamer (Iarocci) tube and steel Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  5. Publication about Strangeness and Heavy Flavor • Single Identified Hadron Spectra from sNN = 130 GeV Au+Au Collisions • K. Adcox et al., Phys. Rev. C 69, 024904 (2004) • Centrality dependence of p, K, p andp production from sNN =130 GeV Au+Au collisions at RHIC • K. Adcox et al., Phys. Rev. Lett. 88, 242301 (2002) • Measurement of the L andL particles in Au+Au Collisions at sNN =130 GeV • K. Adcox et al., Phys. Rev. Lett. 89, 092302 (2002) • Identified Charged Particle Spectra and Yields in Au+Au Collisions at sNN = 200 GeV • S. S. Adler et al., Phys. Rev. C 69, 034909 (2004) • Elliptic Flow of Identified Hadrons in Au+Au Collisions at sNN = 200 GeV • S.S. Adler et al, Phys.Rev.Lett. 91 182301 (2003) • Measurement of Single Electrons and Implications for Charm Production in Au+Au Collisions at sNN =130 GeV • K. Adcox et al., Phys. Rev. Lett. 88, 192303 (2002) • J/y production from proton-proton collisions at s = 200 GeV • S.S. Adler et al., Phys. Rev. Lett. 92, 051802 (2004) • J/y Production in Au-Au Collisions at sNN =200 GeV at the Relativistic Heavy Ion Collider • S.S. Adler et al., Phys. Rev. C 69, 014901 (2004) Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  6. Bulk Properties at RHIC Topics related to this talk • What we learnt from RHIC? • Low pT (<~2GeV/c) phenomena • Thermalization • Elliptic Flow • Agreement with Hydrodynamical calculations • Chemical freeze-out • The model well describes the data and strangeness equilibration at RHIC • Radial Flow • Single spectra of p, K, p are described by common temperature and flow velocity • Intermediate and high pT (>~2GeV/c) phenomena • Dense matter effect in Au+Au collisions • High pT suppression in single particle spectra • Back-to-Back jet suppression • Different effect in Baryon/meson • Mass scaling? • Due to number of consistent quarks? • Any difference in flavor (between light quark (u,d) and s)? Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  7. Elliptic Flow Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  8. Elliptic Flow at 62.4 GeV Au+Au sNN = 62.4 GeV Au+Au centrality : 0-84% sNN = 200 GeV Au+Au centrality : 0-92% v2 v2 stat. error only sys. error <15% stat. error only sys. error <20% Charged p,K,p : PRL91, 182301 (2003) p0 : work in progress PHENIX preliminary pT [GeV/c] pT [GeV/c] • Identified particle v2 from 62.4 GeV Au+Au • Looks similar p, K, p dependence with 200GeV Au+Au • With more statistics, we will be able to do detail analyses • Centrality dependence • More particle species (How about L, f, etc.?) Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  9. Elliptic flow : nquark Scaling 62.4 GeV Au+Au: PHENIX preliminary 200 GeV Au+Au, charged p,K,p : from PRL p0 : work in progress stat. error only sys. error <20% (62GeV) 15% (200GeV) • A scaling of number of constituent quark • Quark coalescence picture • 62.4GeV Au+Au • The scaling looks working like 200 GeV Au+Au • Seems to be slightly lower than 200 GeV in pT/nquark<1 GeV/c v2 /nquark pT /nquark [GeV/c] Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  10. v2 of Heavy Flavor Electrons sNN = 200 GeV Au+Au centrality : 0-92% Heavy Flavor e±v2 V. Greco, C.M. Ko, R. Rapp nucl-th/0312100 w/ charm flow w/o charm flow 100% of “photonic electron” “r(pT)”  “ ” Glossary • Photonic electron : e± from • Dalitz decay of p0, h, w, f • di-electron decays r, w, f • photon conversions • kaon decays ( pen) r : photonic electron / inclusive electron v2heavy-flavor-e v2inclusive-e - r v2photo-electron 1 – r = • v2 of Heavy flavor electron • Looks consistent with/without charm flow • We hope that run4 data will give an answer bin width 0.3 0.25 0.2 0.15 0.1 0.05 0 -0.05 -0.1 v2 Inclusive e±v2 (statistical error only) Heavy flavor e±v2 Estimation of v2 systematic errors of estimation work in progress Hor. bar : stat. err. Box : total sys. err. 0 1 2 3 4 0 1 2 3 4 pT [GeV/c] Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  11. f meson Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  12. f measurement at PHENIX • Both K+K- and e+e-channel are available • K : mass square from Time-of-Flight from TOF detector and EMCal • e : RICH and EMCal Run3 sNN= 200 GeV d+Au f  K+K- f  e+e- Kaon ID : TOF of PbSc EMCal work in progress work in progress Counts / bin Counts / bin S ~ 120 S/B = 1/4 Invariant mass [GeV/c2] Invariant mass [GeV/c2] Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  13. Single Particle Spectra of f sNN = 200 GeV d+Au, Min. Bias sNN = 200 GeV Au+Au PHENIX final data to be submitted to PRC 10 ] 2 - ) 2 1 [(GeV/c 10-1 PHENIX preliminary 10-1 dy   e+e- N 10-2 T 2 d dm 10-2   K+K- T 10-3 m 1 10-3 p 2 10-4 10-4 K+K- 10-5 10-5 0 0.511.522.5 3 0 0.511.522.5 3 mT – mass [GeV/c2] mT – mass [GeV/c2] Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  14. Inverse Slope Parameter and Yield of f sNN = 200 GeV Au+Au Inverse slope parameter PHENIX final data to be submitted to PRC yield 10-1 ] 10 2 - ) 2 1 sNN = 200 GeV d+Au, Min. Bias 10-2 [(GeV/c PHENIX preliminary stat. err. only 10-1 dy stat. err. only 10-3 N   e+e- T 2 d dm 10-2   K+K- T m 10-4 1 p 2 10-3 10-5 10-4 K+K- 10-5 0 0.511.522.5 3 0 0.511.522.5 3 mT – mass [GeV/c2] mT – mass [GeV/c2] • Extracting inverse slope parameter and yield • Using a fit function Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  15. Inverse Slope Parameter and Yield of f Inverse slope of f Flat as a function of <Npart> Over d+Au and Au+Au Within statistics + systematic error Yield of f Increasing with <Npart> Not simple linear of <Npart> Inverse Slope Parameter [MeV] Hor. bar : stat. err. Box : total sys. err. Hor. bar : stat. err. Box : total sys. err. dN/dy (dN/dy) / (2<Npart> ) <Npart> 200 GeV d+Au (preliminary) 200 GeV Au+Au w/ centrality cut 200GeV Au+Au Min. Bias 200 GeV d+Au (preliminary) 200 GeV Au+Au w/ centrality cut 200GeV Au+Au Min. Bias 0 100 200 300 0 100 200 300 <Npart> <Npart> Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  16. Radial flow Fit range : mT – mass < 1 GeV/c2 Computed by Akio Kiyomichi (2003 DNP / 2004 JPS meeting) • Single particle spectra of p, K, p,p • Well described by Blast wave mode (E.Schnedermann et al, PRC48, 2462 (1993)) fit • Common thermal freeze-out temperature and flow velocity for p, K, p,p • How about for phi meson? Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  17. Does f has same Tfo and <bT> with p, K, p ? Fit range mT -mass < 1 GeV/c2 • Simultaneous fit • The c2 contour plot for each particle 200 GeV Au+Au, 40-92% 200 GeV Au+Au, top 10% 200 GeV Au+Au, 10-40% 3 s 2 s 1 s • Within 3 s • Overlap of f with p, K, p • Large area of c2 contour for f • Because of larger statistical error (i.e. smaller c2) of f than p, K, p • Need more statistics to conclude p, K, p,p p, K, p,p, f Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  18. Does f has same Tfo and <bT> with p, K, p ? 200GeV Au+Au p, K, p : PHENIX, PRC 69, 034909 (2004) f : PHENIX final (to be submitted to PRC) • Simultaneous fit by p, K, p,p and f • Seems to be common Tfo and <bT> • But don’t hurry up to conclude • Again, need more statistics Fit range mT -mass < 1 GeV/c2 Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  19. Intermediate pT phenomena sNN = 200 GeV Au+Au Yield (0 – 10%) / Ncoll(0 – 10%) Shown in PHENIX white paper Yield (40 – 92%) / Ncoll(40 – 92%) • Energy loss effect in proton at intermediate pT is different from pion • Note : Those are expected to be merged at very high pT (=Rcp) • Rcp of f is close to pion rather than proton • Address a scaling of number of constituent quarks • Statistical error is still large • Need more statistic pT [GeV/c2] Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  20. Exotic Particle Searchin RHIC Energyat PHENIX Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  21. Anti-Pentaquark Search Motivation: Why anti-pentaquark? If a particle exists, anti-particle does Anti-Baryon to Baryon ratio is high (>~0.7) at RHIC energy Channel K+ +n PHENIXn measurement is unique at RHIC (so far) Large energy deposit in EMCal Not photon-like shower shape No charged track association on the candidate Momentum reconstruction from Time-Of-Flight • Pentaquark state is still not established yet • Many positive results • Many negative results • How about at PHENIX? • So far, negative with current statistics • We report a summary of the search in s(NN)=200 GeV p+p, d+Au, Au+Au Summary table from hep-ex/0406077 Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  22. Reliability of Anti-n Candidate 200 GeV p+p 200 GeV p+p n + - n + + Counts / bin No pT cut No pT cut • Same event • high pT • photon trigger • Mixed event • MinBias trigger - + 1.11.21.31.41.51.6 1.11.21.31.41.51.6 Invariant mass [GeV/c2] Marker : Data Dash line : MC + mass peak[GeV/c] mass from PDG - pT [GeV/c] • Anti-n momentum resolution checked • Applying the reconstruction method to anti-proton • Comparison of momentum from TOF and tracking • Resolution<4%,10%,15% in pT<1.0, 1.5, 2.0 GeV/c, respectively • Momentum shift <~5% • Invariant mass peak ofS • -(1189.4)n + - : R.R. 99.85%, c-= 2.396cm • +(1197.4)n + + : B.R. 48.31%, c+= 4.434cm • Mass shift due to no TOF calibration for n in EMCal is <~5% • Quick check by Monte-Carlo shows agreement with data Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  23. K + +n in p+p, d+Au, Au+Au • Run3 s = 200 GeV p+p • Minimum bias trigger • 35 M events • 5 MeV/c2 per bin • Run3 sNN= 200 GeV d+Au • Minimum bias trigger • 91 M events • 5 MeV/c2 per bin Counts / bin Counts / bin work in progress work-in progress Same event Mixed event Same event Mixed event • Run2 sNN = 200GeV Au+Au • Minimum bias trigger • 36M events • 4 MeV/c2 per bin Same event Mixed event Top 30% central 30-50% 50-92% Counts / bin work in progress work in progress work in progress No significant signal seen Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  24. More Strangeness at PHENIX f K0s pT =1-2 GeV/c pT =1-2 GeV/c • Demonstration from • Run3 sNN =200 GeV p+p • ~24M events of Min Bias trigger r0 Invariant mass [GeV/c2] Invariant mass [GeV/c2] pT =1-2 GeV/c L(1520)? pT =1-2 GeV/c K*0 Not enough statistics.. Invariant mass [GeV/c2] Invariant mass [GeV/c2] S+ S- L pT =1-2 GeV/c pT =1-2 GeV/c pT =1-2 GeV/c Invariant mass [GeV/c2] Invariant mass [GeV/c2] Invariant mass [GeV/c2] • From combinations of p±, K±, p,p, andn • Blue histograms • Pair from save event • Red histograms • Combinatorial back ground from event mixing from Min. Bias trigger • Normalization range • solid filled area Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  25. Future Measurement of Strangeness and Heavy Flavorat PHENIX Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  26. Aerogel Cherenkov Counter PMT (3 inch) Integration Cube (Air) Reflector (Goretex) PMT (3 inch) Aerogel (index~1.011) （11x22x20 cm3） 160 segments Azimuthal angle Half of them in 2003 z (beam) direction charged track • Modules for half sector are installed in 2003 • Left half modules are already installed in July 2004 • Enhancement of PID capability at PHENIX • Proton separation from p/K up to p = 7 GeV/c Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  27. PID Plot with Aerogel Cherenkov Counter • With(without) requiring Cherenkov light associated to the track • We can see pion enhancement (rejection) • It will be functional to study intermediate pT range Aerogel Required (Np.e.>3 in each PMT) Aerogel Veto (Np.e.<1 in each PMT) Peak position (calibration is not perfect yet) Statistics used for this analysis is less than 4% of total data from run4 Experimental resolution (2-sigma) line Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  28. Upgrade Plan around Vertex h = 0.35 h = 0.70 h = 0.88 h = 1.17 Provides tracking coverage over -2.6 < h < 2.6 • Silicon Vertex detector and TPC • Enhancement of momentum resolution • Measurement of in-flight-decay particle • Will reduce background at high pT • Nosecone Calorimeter • Jet measurement in forward region • Hadron Blind Detector • (not shown in the plot) • Surrounds TPC • Electron ID by Cherenkov radiation detected by a photocathode layer h = 2.6 Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  29. Summary Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  30. Summary • Elliptic flow of charged p, K, p from 62.4 GeV Au+Au • Similar p, K, p dependence with 200GeV Au+Au • Quark coalescence picture still works in pT /nquark<1 GeV/c • Heavy flavor electron from 200 GeV Au+Au • Consistent with/without Charm flow • Cross section of f meson • 200GeV d+Au and Au+Au • Less <Npart> dependence of inverse slope parameter (from mT exponential fit) • dN/dy increases with <Npart>, but liner scaling • Study of blast wave model fit • There is overlap of (Tfo, <bT>) of f with p, K, p • But large range of within-3-sigma of f • need more statistics for detail analysis • Rcp is close to pion’s • support quark number scaling not mass • Anti-Pentaquark search at PHENIX • No significant signal in 200 GeV p+p, d+Au, Au+Au • It might be due to S/N ratio is poor at PHENIX • Because of no significant peak of L(1520) • With mixing-event technique, we will have the other strangeness • New detectors • Aerogel Cherenkov counters are installed • PHENIX PID capability (proton separation from p/K) will be increased up to pT=7 GeV/c • Silicon VTX, HBD, TPC will come to help electron measurements Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  31. About Sound Between Sections You hear sound between sections. That is from “Noh” which is Japanese traditional lyrical drama. “Noh” is completed as current style about 800 years ago in Muromachi shogunate era. The voice is “Yohhhh.” Following that, the sound of musical instrument “Pon” is hit of “Tsuzumi” which is Japanese hand drum. The voice and sound of Tsuzumi are used for adjustment of timing and atmosphere of a serif, and changing a scene. Therefore, I used it for changing section and subject. By the way, the opening music is not traditional. I borrowed it from a recent Japanese drama. Masashi Kaneta { Yoh Pon Click them Yohhh Po Po Pon Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  32. Backup Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  33. BBC Reaction Plane Resolution <cos(2[FBBCN-FBBCS])> <sin(2[FBBCN-FBBCS])> 200 GeV Au+Au Correlation 62.4 GeV Au+Au Correlation BBC Charge sum Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  34. 1/”r” Inclusive electron / photonic electron Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  35. Heavy flavor electron v2 photonic electron non-photonic (=heavy flavor) electron inclusive electron { Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  36. Anti-Neutron PID 1 channel 5.5cm Data 0.5GeV photon all charged tracks Energy MC Energy deposit/tower [GeV] p-p+ 0.5GeV anti-n K- K+ MC Energy deposit of absorption pbar p charge  EMC TOF Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  37. PID Capability with ACC Run4 Au+Au 200GeV p K TOF Aerogel (+ TOF or RICH) RICH 1 2 3 4 5 6 7 ~10 Momentum [GeV/c] 3.7 2.5 4.2 0.5 5.5  K p Aerogel : (n=1.011.) TOF : 100 ps time resolution RICH : CO2, (n = 1.00041) Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  38. STAR PHENIX sNN = 200 GeV Au+Au PHENIX final data to be submitted to PRC ] 10 2 - ) 2 1 [(GeV/c 10-1 dy N T 2 d dm 10-2 T m 1 p 10-3 2 10-4 K+K- 10-5 0 0.511.522.5 3 mT – mass [GeV/c2] STAR 200GeV Au+Au from preprint Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  39. STAR PHENIX Inverse Slope Parameter [MeV] Hor. bar : stat. err. Box : total sys. err. Hor. bar : stat. err. Box : total sys. err. dN/dy (dN/dy) / (2<Npart> ) <Npart> 200 GeV d+Au (preliminary) 200 GeV Au+Au w/ centrality cut 200GeV Au+Au Min. Bias 200 GeV d+Au (preliminary) 200 GeV Au+Au w/ centrality cut 200GeV Au+Au Min. Bias 0 100 200 300 0 100 200 300 <Npart> <Npart> STAR 200GeV Au+Au from preprint Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

  40. STAR PHENIX pT<~1 GeV/c Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”

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