Münster 2002 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 6: Heavy Ions I
HK 6.5: Vortrag
Montag, 11. März 2002, 18:00–18:15, E
Directed and Elliptical Flow Measured with the Forward-TPCs of the STAR Experiment — •Markus Oldenburg, Volker Eckardt, Andreas Gärtner, Patrizia Krok, Gaspare Lo Curto, Maria Mora, Jörn Putschke, Norbert Schmitz, Andreas Schüttauf, Frank Simon, Janet Seyboth, Peter Seyboth, and Michael Vidal — Max-Planck-Institut für Physik, Föhringer Ring 6, 80805 München, Germany
The STAR detector at the Relativistic Heavy Ion Collider (RHIC) measures the hadronic observables of Au+Au collisions at √sNN = 200 GeV per nucleon pair. The ’Max-Planck-Institut für Physik’ in Munich contributes two Forward-TPCs which expand the overall acceptance of STAR into the pseudorapidity region 2.5<|η|<4.
Hydrodynamical models predict that in peripheral heavy-ion collisions the initial spatial anisotropy of the reaction zone is transformed into an anisotropy in the momentum distribution of the produced particles. This is caused by the pressure gradient generated at a very early stage of the collision. Anisotropic flow measures these azimuthal anisotropies by a Fourier expansion of the azimuthal angular distribution of the detected hadrons.
Due to their acceptance coverage the FTPCs are suited to measure not only elliptical flow v2 (2nd order Fourier coefficient) as the TPC already did in the region |η|<1.5 but also directed flow v1 (1st order Fourier coefficient). Therefore these detectors allow the determination of the (up to now) unknown sign of v2. In this talk a feasibility study and first results of the flow measurement with the FTPCs will be presented.