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

3. Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX” 2 Outlook of this talk PHENIX experiment Future strangeness and heavy flavor measurement at PHENIX –Charged hadron identification at high p T : Aerogel Cherenkov Counter –Upgrade around vertex : Silicon Vertex, Hadron Blind Detector, TPC Nosecone Calorimeter Recent results from PHENIX –Event anisotropy 62.4GeV Au+Au :  , K , p, and p (comparing with 200GeV) 200 GeV Au+Au : Heavy flavor electron –Single particle spectra of  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) Summary

4. Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX” 3 USAAbilene 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 BrazilUniversity of São Paulo, São Paulo ChinaAcademia Sinica, Taipei, Taiwan China Institute of Atomic Energy, Beijing Peking University, Beijing FranceLPC, 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 GermanyUniversity of Münster, Münster HungaryCentral Research Institute for Physics (KFKI), Budapest Debrecen University, Debrecen Eötvös Loránd University (ELTE), Budapest IndiaBanaras Hindu University, Banaras Bhabha Atomic Research Centre, Bombay IsraelWeizmann Institute, Rehovot JapanCenter 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. KoreaCyclotron 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 RussiaInstitute 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 SwedenLund University, Lund 12 Countries; 58 Institutions; 480 Participants* *as of January 2004

5. 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) , 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 ( 0, ,...) –EMCal (PbSc, PbGl) Muon –Muon Tracker (MuTr) Cathode-strip readout chamber –Muon Identifier (MuID) Streamer (Iarocci) tube and steel

6. 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 s NN = 130 GeV Au+Au Collisions –K. Adcox et al., Phys. Rev. C 69, 024904 (2004) Centrality dependence of  , K , p andp production from s NN =130 GeV Au+Au collisions at RHIC –K. Adcox et al., Phys. Rev. Lett. 88, 242301 (2002) Measurement of the  and particles in Au+Au Collisions at s NN =130 GeV –K. Adcox et al., Phys. Rev. Lett. 89, 092302 (2002) Identified Charged Particle Spectra and Yields in Au+Au Collisions at s NN = 200 GeV –S. S. Adler et al., Phys. Rev. C 69, 034909 (2004) Elliptic Flow of Identified Hadrons in Au+Au Collisions at s NN = 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 s NN =130 GeV –K. Adcox et al., Phys. Rev. Lett. 88, 192303 (2002) J/ production from proton-proton collisions at s = 200 GeV –S.S. Adler et al., Phys. Rev. Lett. 92, 051802 (2004) J/ Production in Au-Au Collisions at s NN =200 GeV at the Relativistic Heavy Ion Collider –S.S. Adler et al., Phys. Rev. C 69, 014901 (2004)

7. Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX” 6 Bulk Properties at RHIC What we learnt from RHIC? –Low p T (<~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 , K, p are described by common temperature and flow velocity –Intermediate and high p T (>~2GeV/c) phenomena Dense matter effect in Au+Au collisions –High p T 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)? Topics related to this talk

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

9. Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX” 8 Elliptic Flow at 62.4 GeV Au+Au Identified particle v 2 from 62.4 GeV Au+Au –Looks similar , 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 , etc.?) v2v2 p T [GeV/c] PHENIX preliminary s NN = 62.4 GeV Au+Au centrality : 0-84% stat. error only sys. error <20% v2v2 p T [GeV/c] Charged ,K,p : PRL91, 182301 (2003)  0 : work in progress s NN = 200 GeV Au+Au centrality : 0-92% stat. error only sys. error <15%

10. Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX” 9 Elliptic flow : n quark Scaling A scaling of number of constituent quark –Quark coalescence picture stat. error only sys. error <20% (62GeV) 15% (200GeV) 62.4 GeV Au+Au: PHENIX preliminary 200 GeV Au+Au, charged p,K,p : from PRL  0 : work in progress p T /n quark [GeV/c] v 2 /n quark 62.4GeV Au+Au –The scaling looks working like 200 GeV Au+Au –Seems to be slightly lower than 200 GeV in p T /n quark <1 GeV/c

11. Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX” 10 v 2 of Heavy Flavor Electrons v 2 of Heavy flavor electron –Looks consistent with/without charm flow –We hope that run4 data will give an answer 0 1 2 3 4 p T [GeV/c] 0.3 0.25 0.2 0.15 0.1 0.05 0 -0.05 -0.1 v2v2 bin width systematic errors of estimation Inclusive e ± v 2 (statistical error only) Heavy flavor e ± v 2 100% of “photonic electron” “r (p T )”  “ ” s NN = 200 GeV Au+Au centrality : 0-92% Photonic electron : e ± from Dalitz decay of  0, , ,  di-electron decays , ,  photon conversions kaon decays ( e) r : photonic electron / inclusive electron Glossary v 2 inclusive-e - r v 2 photo-electron 1 – r v 2 heavy-flavor-e = Estimation of v 2 Heavy Flavor e ± v 2 w/ charm flow w/o charm flow V. Greco, C.M. Ko, R. Rapp nucl-th/0312100 Hor. bar : stat. err. Box : total sys. err. work in progress

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

13. Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX” 12  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 Kaon ID : TOF of PbSc EMCal work in progress Counts / bin S ~ 120 S/B = 1/4 Counts / bin Invariant mass [GeV/c 2 ] K + K - e + e - work in progress Run3  s NN = 200 GeV d+Au

14. Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX” 13 Single Particle Spectra of  ] ) [(GeV/c 2 1 2 - 2 2 dy dm N d m T T  0 0.5 1 1.5 2 2.5 3 m T – mass [GeV/c 2 ] 1 10 -1 10 -2 10 -3 10 -4 10 -5 10 PHENIX final data to be submitted to PRC s NN = 200 GeV Au+Au  K + K - m T – mass [GeV/c 2 ] 0 0.5 1 1.5 2 2.5 3 10 -1 10 -2 10 -3 10 -4 10 -5 PHENIX preliminary s NN = 200 GeV d+Au, Min. Bias   e+e-  e+e-   K+K-  K+K-

15. Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX” 14 Inverse Slope Parameter and Yield of  Extracting inverse slope parameter and yield –Using a fit function Inverse slope parameter yield m T – mass [GeV/c 2 ] 0 0.5 1 1.5 2 2.5 3 10 -1 10 -2 10 -3 10 -4 10 -5 PHENIX preliminary s NN = 200 GeV d+Au, Min. Bias   e+e-  e+e-   K+K-  K+K- stat. err. only ] ) [(GeV/c 2 1 2 - 2 2 dy dm N d m T T  0 0.5 1 1.5 2 2.5 3 m T – mass [GeV/c 2 ] 1 10 -1 10 -2 10 -3 10 -4 10 -5 10 PHENIX final data to be submitted to PRC s NN = 200 GeV Au+Au  K + K - stat. err. only

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

17. Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX” 16 Computed by Akio Kiyomichi (2003 DNP / 2004 JPS meeting) Radial flow Single particle spectra of  , 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  , K , p,p –How about for phi meson? Fit range : m T – mass < 1 GeV/c 2

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

19. Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX” 18 Does  has same T fo and with , K, p ? Simultaneous fit by  , K , p,p and  –Seems to be common T fo and –But don’t hurry up to conclude –Again, need more statistics Fit range m T -mass < 1 GeV/c 2 200GeV Au+Au , K, p : PHENIX, PRC 69, 034909 (2004)  : PHENIX final (to be submitted to PRC)

20. Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX” 19 Intermediate p T phenomena Energy loss effect in proton at intermediate p T is different from pion –Note : Those are expected to be merged at very high p T (=R cp ) Yield (0 – 10%) / N coll (0 – 10%) Yield (40 – 92%) / N coll (40 – 92%) p T [GeV/c 2 ] R cp of  is close to pion rather than proton –Address a scaling of number of constituent quarks –Statistical error is still large Need more statistic Shown in PHENIX white paper s NN = 200 GeV Au+Au

21. Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX” 20 Exotic Particle Search in RHIC Energy at PHENIX

22. 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 Summary table from hep-ex/0406077 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

23. Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX” 22 Reliability of Anti-n Candidate Anti-n momentum resolution checked –Applying the reconstruction method to anti-proton Comparison of momentum from TOF and tracking –Resolution<4%,10%,15% in p T <1.0, 1.5, 2.0 GeV/c, respectively –Momentum shift <~5% p T [GeV/c] mass peak [GeV/c] Marker : Data Dash line : MC -- ++ mass from PDG –Invariant mass peak of   - (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 -- ++ 1.1 1.2 1.3 1.4 1.5 1.6 Counts / bin n +  - n +  + No p T cut 200 GeV p+p Same event high p T photon trigger Mixed event MinBias trigger Invariant mass [GeV/c 2 ]

24. 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/c 2 per bin work-in progress Same event Mixed event Counts / bin work in progress Run3  s NN = 200 GeV d+Au – Minimum bias trigger – 91 M events – 5 MeV/c 2 per bin Same event Mixed event Counts / bin Top 30% central 30-50% 50-92% work in progress Same event Mixed event Run2  s NN = 200GeV Au+Au – Minimum bias trigger – 36M events – 4 MeV/c 2 per bin Counts / bin No significant signal seen

25. Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX” 24 More Strangeness at PHENIX From combinations of  ±, K ±, p,p, andn Invariant mass [GeV/c 2 ] 00 K0sK0s p T =1-2 GeV/c Invariant mass [GeV/c 2 ] p T =1-2 GeV/c  Invariant mass [GeV/c 2 ] K *0 p T =1-2 GeV/c Invariant mass [GeV/c 2 ] Not enough statistics..    p T =1-2 GeV/c Invariant mass [GeV/c 2 ]  p T =1-2 GeV/c Invariant mass [GeV/c 2 ]  p T =1-2 GeV/c Invariant mass [GeV/c 2 ]  p T =1-2 GeV/c Demonstration from –Run3 s NN =200 GeV p+p –~24M events of Min Bias trigger Blue histograms –Pair from save event Red histograms –Combinatorial back ground from event mixing from Min. Bias trigger –Normalization range »solid filled area

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

27. Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX” 26 Aerogel Cherenkov Counter 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 /K up to p = 7 GeV/c charged track 160 segments z (beam) direction Azimuthal angle Half of them in 2003 Reflector (Goretex) PMT (3 inch) Aerogel (index~1.011) （ 11x22x20 cm 3 ） Integration Cube (Air) PMT (3 inch)

28. 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 p T range Aerogel Required (N p.e. >3 in each PMT) Aerogel Veto (N p.e. <1 in each PMT) Peak position (calibration is not perfect yet) Experimental resolution (2-sigma) line Statistics used for this analysis is less than 4% of total data from run4

29. Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX” 28 Upgrade Plan around Vertex  = 1.17  = 0.88  = 0.70  = 0.35 Provides tracking coverage over -2.6 <  < 2.6 Silicon Vertex detector and TPC –Enhancement of momentum resolution –Measurement of in-flight-decay particle Will reduce background at high p T  = 2.6 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

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

31. Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX” 30Summary Elliptic flow of charged , K, p from 62.4 GeV Au+Au –Similar , K, p dependence with 200GeV Au+Au –Quark coalescence picture still works in p T /n quark <1 GeV/c Heavy flavor electron from 200 GeV Au+Au –Consistent with/without Charm flow Cross section of  meson –200GeV d+Au and Au+Au Less dependence of inverse slope parameter (from m T exponential fit) dN/dy increases with, but liner scaling –Study of blast wave model fit There is overlap of (T fo, ) of  with , K, p –But large range of within-3-sigma of  –need more statistics for detail analysis –R cp 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 (1520) –With mixing-event technique, we will have the other strangeness New detectors –Aerogel Cherenkov counters are installed PHENIX PID capability (proton separation from /K) will be increased up to p T =7 GeV/c –Silicon VTX, HBD, TPC will come to help electron measurements

32. 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 Yohhh Po Po Pon Click them {

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

34. Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX” 33 BBC Reaction Plane Resolution BBC Charge sum Correlation 200 GeV Au+Au 62.4 GeV Au+Au

35. Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX” 341/”r” Inclusive electron / photonic electron

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

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

38. Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX” 37 PID Capability with ACC Run4 Au+Au 200GeV  K TOF Aerogel (+ TOF or RICH) RICH Momentum [GeV/c]  K p 1234567 0.5 2.5 ~10 4.2 Aerogel : (n=1.011. ) TOF : 100 ps time resolution RICH : CO 2, (n = 1.00041) 5.5 3.7

39. Masashi Kaneta, RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX” 38 STAR PHENIX STAR PHENIX ] ) [(GeV/c 2 1 2 - 2 2 dy dm N d m T T  0 0.5 1 1.5 2 2.5 3 m T – mass [GeV/c 2 ] 1 10 -1 10 -2 10 -3 10 -4 10 -5 10 PHENIX final data to be submitted to PRC s NN = 200 GeV Au+Au  K + K - STAR 200GeV Au+Au from preprint

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

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