Online Pattern Recognition for the ALICE High Level Trigger

Details Online Pattern Recognition for the ALICE High Level Trigger Online Pattern Recognition for the ALICE High Level Trigger

2003-07-21

arxiv.org/abs/physics/0307102v1

Physics

Instrumentation and Detectors

Realtime Conference 2003, Montreal, Canada to be published in IEEE Transactions on Nuclear Science (TNS), 6 pages, 8 figures

Scientific paper

10.1109/TNS.2004.829384

The ALICE High Level Trigger has to process data online, in order to select interesting (sub)events, or to compress data efficiently by modeling techniques.Focusing on the main data source, the Time Projection Chamber (TPC), we present two pattern recognition methods under investigation: a sequential approach "cluster finder" and "track follower") and an iterative approach ("track candidate finder" and "cluster deconvoluter"). We show, that the former is suited for pp and low multiplicity PbPb collisions, whereas the latter might be applicable for high multiplicity PbPb collisions, if it turns out, that more than 8000 charged particles would have to be reconstructed inside the TPC. Based on the developed tracking schemes we show, that using modeling techniques a compression factor of around 10 might be achievable

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