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Centrality and Energy Dependence of Meson, Proton and Hyperon Production Christoph Blume for the Collaboration.

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Presentation on theme: "Centrality and Energy Dependence of Meson, Proton and Hyperon Production Christoph Blume for the Collaboration."— Presentation transcript:

1 Centrality and Energy Dependence of Meson, Proton and Hyperon Production Christoph Blume for the Collaboration

2 The NA49 Collaboration C. Alt, T. Anticic, B. Baatar, D. Barna, J. Bartke, L. Betev, H. Białkowska, C. Blume, B. Boimska, M. Botje, J. Bracinik, R. Bramm, P. Bunčić, V. Cerny, P. Christakoglou, P. Chung, O. Chvala, J.G. Cramer, P. Csató, P. Dinkelaker, V. Eckhardt, D. Flierl, Z. Fodor, P. Foka, V. Friese, J. Gál, M. Gaździcki, V. Genchev, G. Georgopoulos, E. Gładysz, K. Grebieszkow, S. Hegyi, C. Höhne, K. Kadija, A. Karev, D. Kikola, M. Kliemant, S. Kniege, V.I. Kolesnikov, E. Kornas, R. Korus, M. Kowalski, I. Kraus, M. Kreps, A. Laszlo, R. Lacey, M. van Leeuwen, P. Lévai, L. Litov, B. Lungwitz, M. Makariev, A.I. Malakhov, M. Mateev, G.L. Melkumov, A. Mischke, M. Mitrovski, J. Molnár, S. Mrówczyński, V. Nicolic, G. Pálla, A.D. Panagiotou, D. Panayotov, A. Petridis, W. Peryt, M. Pikna, J. Pluta, D. Prindle, F. Pühlhofer, R. Renfordt, C. Roland, G. Roland, M. Rybczyński, A. Rybicki, A. Sandoval, N. Schmitz, T. Schuster, P. Seyboth, F. Siklér, B. Sitar, E. Skrzypczak, M. Slodkowski, G. Stefanek, R. Stock, C. Strabel, H. Ströbele, T. Susa, I. Szentpétery, J. Sziklai, M. Szuba, P. Szymanski, V. Trubnikov, D. Varga, M. Vassiliou, G.I. Veres, G. Vesztergombi, D. Vranić, A. Wetzler, Z. Włodarczyk, A. Wojtaszek, I.K. Yoo, and J. Zimányi Christoph Blume Quark Matter, Nov

3 Outline Protons Light fragments (t, 3He) Hyperons Elliptic Flow
Energy dependence of stopping Light fragments (t, 3He) Coalescence  production at chemical freeze-out Hyperons System size dependence at 40 and 158A GeV Elliptic Flow Scaling properties at SPS (quark number, KEt) High-pt Baryon-meson ratios Nuclear suppression relative to p+A Christoph Blume Quark Matter, Nov

4 Protons (Anti-)Proton y-Spectra in Central Pb+Pb
Mid-rapidity (TOF analysis) Phys. Rev. C 73 (2006), NA49 preliminary NA49 preliminary p p Forward rapidities (dE/dx analysis) E. Kornas Central Pb+Pb (7 %) Feed-down corrected Syst. error  10% New data points at forward rapidities dE/dx-Analysis Clear evolution of shape for protons Christoph Blume Quark Matter, Nov

5 Protons Net-Baryon Distributions in Central Pb+Pb
20A GeV 30A GeV 40A GeV 80A GeV Construction of total net-baryon distributions Scaling factors S X taken from statistical model fits (F. Becattini et al., Phys. Rev. C 73 (2006), ) Christoph Blume Quark Matter, Nov

6 Protons Energy-Dependence of Net-Baryons
158A GeV Phys. Rev. Lett. 82 (1999), 2471 E802 Phys. Rev. C 60 (1999), BRAHMS Phys. Rev. Lett. 93 (2004), NA49 preliminary Central Pb+Pb/Au+Au Change of shape most pronounced at SPS energies Peak  dip structure Mid-rapidity net-baryon density decreases rapidly Christoph Blume Quark Matter, Nov

7 Protons Energy-Dependence of Stopping
y /yp  0.6 at AGS+SPS Drops towards RHIC energies Good agreement with UrQMD UrQMD values correspond to almost energy independent xF ( 0.38) NA49 preliminary Central Pb+Pb/Au+Au Averaged rapidity shift y : UrQMD M. Bleicher, Florence Workshop on Critical Point an Onset of Deconfinement, 2006 Christoph Blume Quark Matter, Nov

8 Protons Energy-Dependence of Inelasticity
Inelasticity in central A+A around K  Indications for weak energy dependence at SPS ? Central data NA49 preliminary Energy of single net-baryon: Total inel. energy per net-baryon: Central data NA49 preliminary NA35 Phys. Rev. Lett. 72 (1994), 1419 Christoph Blume Quark Matter, Nov

9 Light Fragments Rapidity Distributions of 3He
Concave shape is energy independent Contrast to protons Coalescence picture ? NA49 data V. Kolesnikov NA49 preliminary 3He Central Pb+Pb 3He identification (dE/dx + TOF): 3He t d Christoph Blume Quark Matter, Nov

10 Light Fragments mt-m0 Spectra of t and 3He
NA49 preliminary t Central Pb+Pb |y | < 1.0 NA49 preliminary 3He Central Pb+Pb |y | < 1.0 Provides constraints to coalescence models  Extraction of mt-m0 from data (+2 exp. fit for extrapolation) Christoph Blume Quark Matter, Nov

11 Light Fragments Energy-Dependence of 3He Yields
Central Pb+Pb 4 yields NA49 preliminary Agrees with statistical hadron gas prediction 4 extrapolation ? Clusters produced at chemical freeze-out? How about coalescence at thermal freeze-out? Do both coincide? Statistical hadron gas model (SHM): F. Becattini et al., Phys. Rev. C 73 (2006), , and private communication Christoph Blume Quark Matter, Nov

12 Hyperons System Size Dependence of Yields
New data on  ,, - production in minimum bias Pb+Pb at 40A GeV NA49 preliminary Mid-rapidity: |y| < 0.4 (, ) |y| < 0.5 (-) NA49 preliminary Data at 158A GeV M. Mitrovski et al., arXiv:nucl-ex/ Open symbols: Central Filled symbols: Min. bias Christoph Blume Quark Matter, Nov

13 Hyperons Hyperon Enhancement at 158A GeV
Enhancement factor: p+p baseline! NA49 preliminary Mid-rapidity: |y| < 0.4 158A GeV Enhancement increases with system size for - No significant size dependence observed for  and  Open symbols: Central Filled symbols: Min. bias NA49 data M. Mitrovski et al., arXiv:nucl-ex/ Christoph Blume Quark Matter, Nov

14 Elliptic Flow Scaling Properties of v2 (Pb+Pb at 158A GeV)
Scaling with KEt/n ? Ok for , p,  K0s below others Definition of KEt : KEt Scaling M. Issah and A. Taranenko, arXiv:nucl-ex/ R. Lacey and A. Taranenko, arXiv:nucl-ex/ NA49 preliminary Quark number scaling ? Quark coalescence picture pt-reach at SPS too small ? NA49 preliminary NA49 poster G. Stefanek NA49 data G. Stefanek et al., arXiv:nucl-ex/ Christoph Blume Quark Matter, Nov

15 High-pt Energy Dependence of Baryon/Meson-Ratios
NA49 preliminary p/+ p/- /K0s NA49 preliminary NA49 preliminary Central Pb+Pb (sNN = 17.3 GeV) Central Au+Au (sNN = 200 GeV) NA49 T. Schuster et al., arXiv: nucl-ex/ STAR arXiv: nucl-ex/ pt-dependence of baryon/meson ratio appears to be energy independent PHENIX Phys. Rev. C 69 (2004), Christoph Blume Quark Matter, Nov

16 High-pt Nuclear Suppression Factor
relative to p+A baseline Larger pt-reach than p+p at SPS Divides out Cronin effect Central Pb+Pb/Au+Au (+ + -)/2 -0.3 < y < 0.7 NA49 preliminary SPS PHENIX Small suppression relative to p+A observed at SPS for pt < 2.5 GeV/c NA49 poster Z. Fodor, A. Laszlo, G. Vesztergombi Christoph Blume Quark Matter, Nov

17 Summary (Anti-)proton rapidity spectra 3He and t production Hyperons
Stopping: y /yp  0.6 at AGS+SPS Inelasticity approx. energy independent in A+A (K  ) 3He and t production Concave 3He rapidity distribution, shape independent of energy Remarkable agreement of 3He yields with statistical model Hyperons New data on system size dependence of -, ,  production Elliptic flow KEt scaling at the SPS? High-pt Same pt-dependence of baryon/meson ratio at SPS and RHIC Christoph Blume Quark Matter, Nov

18 The End Christoph Blume Quark Matter, Nov

19 Light Fragments Mass Dependence of mt-m0
Linear dependence of mt-m0 on cluster mass Same at all energies (20 – 80A GeV) 20A GeV NA49 preliminary Central Pb+Pb |y | < 1.0 Coalescence with blast wave: (A. Polleri et al., Phys. Lett. B419 (1998) 19 ) Box + lin. velocity profile: mt-m0 ~ A Gaussian + v(r) = vf (r/R): mt-m0 ~ A1- Described by box shaped density profile Christoph Blume Quark Matter, Nov

20 Light Fragments Energy-Dependence of BA
Coalescence parameter BA from p, d, and 3He distributions: Strong but smooth energy dependence of B2 and B3 NA49 preliminary Christoph Blume Quark Matter, Nov

21 Light Fragments A-Dependence of Yields
NA49 preliminary Penalty factor p : mid-rapidity yields Agrees with statistical hadron gas prediction Central Pb+Pb Statistical hadron gas model (SHM): F. Becattini, private communication Christoph Blume Quark Matter, Nov

22 Hyperons System Size Dependence of Slope Parameters
NA49 preliminary NA49 preliminary Fit-range: 0.1GeV < mt-m0 < 0.8 GeV 0.3GeV < mt-m0 (, 158A GeV) Open symbols: Central Filled symbols: Min. bias Mid-rapidity: |y| < 0.4 No system size dependence of T for - Slight dependence for  and  Christoph Blume Quark Matter, Nov

23 Protons Energy-Dependence of Stopping (UrQMD)
UrQMD values correspond to almost energy independent xF ( 0.38) UrQMD M. Bleicher, Florence Workshop on Critical Point an Onset of Deconfinement, 2006 Christoph Blume Quark Matter, Nov

24 Elliptic Flow pt-Dependence of v2
New results on K0s flow Hydro with Tf = 120MeV overpredicts data (P. Huovinen, priv. comm.) NA49 data G. Stefanek et al., arXiv:nucl-ex/ Christoph Blume Quark Matter, Nov

25 High-pt Baryon/Meson-Ratios
increases with pt Similar to RHIC Coalescence models applicable at SPS? Christoph Blume Quark Matter, Nov

26 The NA49 Experiment Setup
Particle identification: Pions, charged Kaons: dEdx in TPCs + TOF (mid-rapidity) K0s, , , : Decay topology + invariant mass : Invariant mass of identified Kaons Christoph Blume Quark Matter, Nov

27 The NA49 Experiment Particle Identification
dE/dx measured in TPCs Large acceptance Resolution 3-4% Time-of-flight Mid-rapidity Resolution 60 ps Example: 40 AGeV Christoph Blume Quark Matter, Nov

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