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Recent Results from the NA49 Experiment Christoph Blume for the Collaboration Strange Quark Matter 2007 Levoča, Slovakia.

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Presentation on theme: "Recent Results from the NA49 Experiment Christoph Blume for the Collaboration Strange Quark Matter 2007 Levoča, Slovakia."— Presentation transcript:

1 Recent Results from the NA49 Experiment Christoph Blume for the Collaboration
Strange Quark Matter 2007 Levoča, Slovakia

2 Outline Protons Hyperons Global  polarisation Elliptic Flow High-pt
Energy dependence of stopping Hyperons System size dependence at 40 and 158A GeV Global  polarisation Quark coupling to QGP global angular momentum Elliptic Flow Scaling properties at SPS (quark number, KEt) High-pt Baryon-meson ratios Nuclear suppression factors Christoph Blume SQM07 Levoča June 2007

3 Protons (Anti-)Proton y-Spectra in Central Pb+Pb
Mid-rapidity data Phys. Rev. C 73 (2006), NA49 preliminary NA49 preliminary p p 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 SQM07 Levoča June 2007

4 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 Statistical Model F. Becattini et al., Phys. Rev. C73 (2006), Christoph Blume SQM07 Levoča June 2007

5 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 SQM07 Levoča June 2007

6 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 and Onset of Deconfinement, 2006 Christoph Blume SQM07 Levoča June 2007

7 Protons Energy-Dependence of Inelasticity
Energy of single net-baryon: Total inel. energy per net-baryon: Inelasticity: Inelasticity in central A+A around K  Indications for weak energy dependence at SPS ? Central data NA49 preliminary Central data NA49 preliminary NA35 Phys. Rev. Lett. 72 (1994), 1419 Christoph Blume SQM07 Levoča June 2007

8 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., J. Phys. G32 (2006) 543. Open symbols: Central Filled symbols: Min. bias Christoph Blume SQM07 Levoča June 2007

9 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 SQM07 Levoča June 2007

10 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 - Weak dependence for  No significant Nw dependence for  Open symbols: Central Filled symbols: Min. bias Christoph Blume SQM07 Levoča June 2007

11 Hyperons Comparison of Enhancements
NA49 preliminary Mid-rapidity: |y| < 0.4 158A GeV Open symbols: Central Filled symbols: Min. bias STAR (sNN = 200GeV): Filled symbols arXiv:nucl-ex/ Stronger Enhancement observed at SPS energies NA57 (sNN = 17.3GeV): Open symbols Nucl. Phys. A698 (2002), 118c. Different size dependence for  Christoph Blume SQM07 Levoča June 2007

12 Global  Polarization Idea
Polarization of quarks Coupling of system orbital momentum to spins of (anti-)quarks in QGP (for non-central A+A collisions) Might survive hadronization as a polarization of hadrons L Reaction Plane  polarization PH relative to the reaction plane H = Hyperon decay parameter * = Angle between momentum of daughter baryon relative to Standard technique for event plane determination EP(1) = Event plane angle REP (1) = Event plane resolution p* = Azimuthal angle rel. to EP Globally polarized QGP Z. Liang and X.N. Wang, Phys. Rev. Lett. 94 (2005), Christoph Blume SQM07 Levoča June 2007

13 Global  Polarization Results
Pb+Pb at 158A GeV minimum bias (12.5–43.5%) No significant polarization P observed Similar to RHIC measurements NA49 preliminary stat. errors only 200GeV (20-70%) 62GeV (0-80%) (GeV/c) STAR Preliminary STAR J. Chen, QM06 arXiv:nucl-ex/ NA49 preliminary stat. errors only Christoph Blume SQM07 Levoča June 2007

14 Elliptic Flow pt-Dependence of v2
New results on K0s flow Mass hierarchy v2() > v2(K0s)  v2 (p) > v2() Hydro withTf = 120MeV overpredicts data Good description by blast wave fit Tf = 90 MeV,  = 0.5 NA49 data G. Stefanek et al., arXiv:nucl-ex/ Hydro model P. Huovinen, priv. comm. Blast wave model F. Retiere and M. Lisa, Phys. Rev. C70 (2004), Christoph Blume SQM07 Levoča June 2007

15 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/ Quark number scaling ? Quark coalescence picture pt-reach at SPS too small ? NA49 preliminary NA49 preliminary Christoph Blume SQM07 Levoča June 2007

16 High-pt Baryon/Meson-Ratios
increases with pt Similar to RHIC Coalescence models applicable at SPS? Christoph Blume SQM07 Levoča June 2007

17 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., J. Phys. G32 (2006), s479. STAR arXiv: nucl-ex/ pt-dependence of baryon/meson ratio appears to be energy independent PHENIX Phys. Rev. C 69 (2004), Christoph Blume SQM07 Levoča June 2007

18 High-pt Nuclear Suppression Factor RAA
Unsatisfactory exp. situation for RAA A+A measurements up to pt = 4.2GeV/c, but no equivalent p+p spectra Consistent with energy loss scenario with constructed p+p baseline (?) s = 19.4GeV Prediction with energy loss dNg/dy = Compilation C. Blume, Nucl. Phys. A783 (2007), 65c. p+p baseline S. Blattnig et al., Phys. Rev. D62 (2000), D. d’Enterria, Phys. Lett. B596 (2004), 32. Energy loss calc. I. Vitev and M. Gyulassy, Phys. Rev. Lett. 89 (2002), Christoph Blume SQM07 Levoča June 2007

19 High-pt Nuclear Suppression Factor: RCP
NA49 PHENIX NA49 preliminary -0.3 < y < 0.7 NA49 preliminary NA49 preliminary Measured baseline Peripheral A+A Feed down corrected RCP() < 1 RCP(p)  1 PHENIX Phys. Rev. C69 (2004), Phys. Rev. C74 (2006), Christoph Blume SQM07 Levoča June 2007

20 High-pt Nuclear Suppression Factor rel. to p+A
Measured baseline p+A spectra Larger pt-reach than p+p at SPS Divides out Cronin effect Small suppression relative to p+A observed at SPS (+ + -)/2 -0.3 < y < 0.7 NA49 preliminary NA49 PHENIX PHENIX Phys. Rev. C69 (2004), Phys. Rev. C74 (2006), Christoph Blume SQM07 Levoča June 2007

21 Summary (Anti-)proton rapidity spectra Hyperons Global  polarization
Stopping: y /yp  0.6 at AGS+SPS Inelasticity approx. energy independent in A+A (K  ) Hyperons New data on system size dependence of -, ,  production Global  polarization No significant polarization observed Elliptic flow KEt scaling at the SPS? High-pt Same pt-dependence of baryon/meson ratio at SPS and RHIC Weak high-pt suppression (pt < 3.5 GeV/c ) Christoph Blume SQM07 Levoča June 2007

22 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 SQM07 Levoča June 2007

23 The End Christoph Blume SQM07 Levoča June 2007

24 Hyperons Comparison of Enhancements
STAR (sNN = 200GeV) arXiv:nucl-ex/ Stronger Enhancement observed at SPS energies NA57 (sNN = 17.3GeV): Open symbols Nucl. Phys. A698 (2002), 118c. Christoph Blume SQM07 Levoča June 2007

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