Frankfurt 2014 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 59: Hadronenstruktur und -spektroskopie

HK 59.1: Group Report

Friday, March 21, 2014, 14:00–14:30, HZ 1+2

Online software trigger at PANDA/FAIR — •Donghee Kang¹, Achim Denig², Klaus Götzen³, Ralf Kliemt¹, Frank Nerling¹, and Klaus Peters³ for the PANDA collaboration — ¹Helmholtz-Institut Mainz, Germany — ²Institut für Kernphysik, Universität Mainz, Germany — ³GSI Helmholtzzentrum für Schwerionenforschung GmbH

The PANDA experiment at FAIR will employ a novel trigger-less read-out system. Since a conventional hardware trigger concept is not suitable for PANDA, a high level online event filter will be applied to perform fast event selection based on physics properties of the reconstructed events. A trigger-less data stream implies an event selection with track reconstruction and pattern recognition to be performed online, and thus analysing data under real time conditions at event rates of up to 40 MHz.The projected data rate reduction of about three orders of magnitude requires an effective background rejection, while retaining interesting signal events. Real time event selection in the environment of hadronic reactions is rather challenging and relies on sophisticated algorithms for the software trigger. The implementation and the performance of physics trigger algorithms presently studied with realistic Monte Carlo simulations will be discussed. The impact of parameters such as momentum or mass resolution, PID probability, vertex reconstruction and a multivariate analysis using the TMVA package for event filtering is presented.