Tracking Strategy and Performance for the Atlas High Level Triggers

Details Tracking Strategy and Performance for the Atlas High Level Triggers Tracking Strategy and Performance for the Atlas High Level Triggers

Apr 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apsp.conf.1077k&link_type=abstract

ASTROPARTICLE, PARTICLE AND SPACE PHYSICS, DETECTORS AND MEDICAL PHYSICS APPLICATIONS . Proceedings of the 9th Conference . Held

Physics

Medical Physics

Scientific paper

Tracking has a central role in the event selection at the High Level Triggers of ATLAS. The earliest stage where tracking information can be used is the Second Level Trigger, where about 10 ms will be available for event processing. This constraint, together with the high multiplicity environment of ATLAS due to the multiple pp collisions, poses great challenges to the track reconstruction algorithms. In this review, we will describe the pattern recognition strategy for tracking in the HLT, and present results on (a) the tracking performance for different trigger signatures, such as single high-pt leptons, b-jets, and exclusive B decays; and (b) timing measurements of the complete tracking chain, including data access, unpacking, clustering, space point formation and the final pattern recognition.

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