Norwegian High-Energy Heavy Ion

Theory 1998 - 2005

Bergen, Oct. 19, 2005

Bergen-Oslo Staff

Bergen-Oslo Junior Staff

?

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”!

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]

• Development of QGSM is continuing

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)

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

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

Finite b & Elliptic flow

Beam

dire

ctio

n

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

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!

Nuclear Theory

Staff