Tübingen 2003 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 20: Physik mit schweren Ionen II
HK 20.9: Talk
Tuesday, March 18, 2003, 18:15–18:30, E
First Results of Directed and Elliptical Flow Measurements with the Forward-TPCs of the STAR Experiment — •Jörn Putschke, Volker Eckardt, Peter Maierbeck, Maria Mora Corral, Markus Oldenburg, Norbert Schmitz, Janet Seyboth, Peter Seyboth, and Frank Simon — Max-Planck-Institut für Physik, Föhringer Ring 6, 80805 München
The two Forward-TPCs, designed and constructed at the Max-Planck-Institut für Physik in Munich, expand the overall acceptance of the STAR detector at the Relativistic Heavy Ion Collider (RHIC) to 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).
First results of Au+Au collisions at √sNN = 200 GeV per nucleon pair will be presented.