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HK: Physik der Hadronen und Kerne
HK 7: Heavy Ions I
HK 7.2: Gruppenbericht
Montag, 8. März 2004, 16:15–16:45, F
Anisotropic Flow and Global Observables in the Forward Directions at RHIC — •Jörn Putschke — Max-Planck-Institut für Physik, Föhringer Ring 6, 80805 München
We present the first observation of directed flow (v1) in Au+Au collisions at 200 GeV at RHIC. Measured by three particle correlations, v1 is found to be independent of pseudorapidity near mid rapidity (η =0) and a peak value of 1.5% around η = 4. This analysis also gives us the first direct indication of in-plane elliptic flow at RHIC.
First results of the centrality and η dependence of particle multiplicity density and mean transverse momenta in this forward region at the STAR experiment will be reported for Au+Au collisions at √sNN = 200 GeV and discussed in connection with the anisotropic flow measurements in the limiting fragmentation picture.
The measurements of the centrality dependence of dN/dη and transverse momentum spectra from mid-rapidity to forward rapidity in d+Au collisions at 200 GeV provide a sensitive tool to understand the dynamics of multi-particle production in the high parton density regime.
Comparsion with theoretical predictions of parton saturation in the Color Glass Condensate [1] and a perturbative QCD parton model [2] will be discussed.
[1] Dmitri Kharzeev, arXiv:hep-ph/0212316 v2 16 Jan 2003
[2] Xin-Nian Wang, arXiv:nucl-th/0303004 v1 3 Mar 2003