Title and Abstract for the seminar talk at IReS on July 5th 2002

Titel: The STAR Level-3 Trigger System

Abstract:
The STAR experiment at RHIC (Relativistic Heavy Ion Collider) on Long 
Island/USA is a large acceptance detector for the measurement of a wide 
variety of observables form heavy ion and p+p collisions. The STAR Level-3 
trigger system is a high level trigger, based on the real-time 
reconstruction of the events. A simple analysis of physics observables 
based on the particle track information is performed and a trigger 
decision can be issued. Central Au+Au collisions can be processed at a 
rate of up to 50$s^{-1}$. In 2001 the Level-3 trigger system was used for 
the first time to enhance rare physics signals in central Au+Au collisions 
e.g. trigger on Antihelium, high momentum particles, $\Upsilon$ (test). 
In 2003 it is planed to use the system for measuring of  $J/\Psi 
\rightarrow e^+ e^-$ and $\Upsilon \rightarrow e^+ e^-$.