Norwegian High-Energy Heavy Ion Theory 1998 - 2005
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Norwegian High-Energy Heavy Ion
Theory 1998 - 2005
Bergen, Oct. 19, 2005
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Bergen-Oslo Staff
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Bergen-Oslo Junior Staff
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?
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An example of important results:
1999: Csernai & Röhrich [Phys.Lett.B458(99)454] observed the “3rd flow component” at SPS energies, not discussed before. It is observable in the directed flow v1. It is a signature of the soft Quark Gluon Plasma.
2004: Five years later, it was first observed at RHIC, and presented now at QM 2004! STAR, PHOBOS & PHENIX have all measured the flow component v1, and have detected the signs of the “3rd flow component”!
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Aihong Tang, Quark Matter 04
Oakland CA4
Directed flow (v1) and phase transition
flow
antiflow
Brachmann, Soff , Dumitru, Stocker, Maruhn, Greiner Bravina, Rischke , PRC 61 (2000) 024909. L.P. Csernai, D. Roehrich PLB 458, 454 (1999) M.Bleicher and H.Stocker, PLB 526,309(2002)
Anti-flow/3rd flow component, with QGP v1 flat at middle rapidity.
Hydro [Csernai, HIPAGS’93]
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• Development of QGSM is continuing
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The model links shadowing in A+A collisions to diffraction. In the high-energy limit the blobs in the diagrams are approximated by Pomeron exchanges.
Input: data from HERA on diffractive and inclusive cross-sections - effective quark and gluon structure functions of nucleon and Pomeron
Gluon shadowing and the nuclear modification factor in Glauber-
Gribov model
Bravina, Zabrodin, Arsene, Tywoniuk (UiO) and A. B. Kaidalov (ITEP)
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Au-Au – directed flow
Au-Au 19.6 GeV h± Au-Au 62.4 GeV h±
Au-Au 130 GeV h± Au-Au 200 GeV h±
Update of directed flow result first
shown at QM2004
Similar (2-subevent) technique
Added 62.4 GeV data
Confirmed with mixed harmonic
analysis
See poster by A. Mignerey in Poster 1, section 2, number 47
PHOBOS preliminary PHOBOS preliminary
PHOBOS preliminary PHOBOS preliminary
0-40% centrality
0-40% centrality0-40% centrality
0-40% centrality
S. Manly – U. Rochester Quark Matter, Budapest, Hungary - August 2005 • 11 • 11
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Baseline analysis overlaid with new PHOBOS mixed
harmonic analysis
Shows non-flow correlations small
Mixed harmonic method: STAR collaboration, Phys. Rev. C 72 (2005) 014904
PHOBOS preliminary h± Au-Au
Au-Au update – directed flow
PHOBOS preliminary h± Au-Au
PHOBOS preliminary h± Au-Au
PHOBOS preliminary h± Au-Au
12 • S. Manly – U. Rochester Quark Matter, Budapest, Hungary - August 2005 • 12
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Finite b & Elliptic flow
Beam
dire
ctio
n
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FOHS - Movies:FOHS - Movies:
B=0, T-fo = 139MeV
B=0, T-fo = 180MeV
B=0.4, T-fo = 139MeV
B=0.4, T-fo = 180MeV
[Dan Strottman, Bernd Schlei, Los Alamos, [Dan Strottman, Bernd Schlei, Los Alamos, LA-UR-03-3410]
Freeze OutFreeze OutFreeze OutFreeze Out
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OUTLOOK
Theoretical heavy ion physics is very much needed by complex experiments, new fundamental problems, and high level education.
We need in Bergen new permanent staff, with resources to plan for the next years!
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Nuclear Theory
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Staff