Speaker
Mr
Gianluca Comune
(Michigan State University)
Description
This paper descibes an analysis and conceptual design for the steering of the ATLAS
High Level Trigger (HLT). The steering is the framework that organises the event
selection software. It implements the key event selection strategies of the ATLAS
trigger, which are designed to minimise processing time and data transfers:
reconstruction within regions of interest, menu-driven selection and fast rejection.
This analysis also considers the needs of online trigger operation, and offline data
analysis. The design addresses both the static configuration and dynamic steering of
event selection. Trigger menus describe the signatures required to accept an event at
each stage of processing. The signatures are arranged in chains through these steps
to ensure coherent selection. The event processing is broken into a series of
sequential steps. At each step the steering will call algorithms needed according to
the valid signatures from the previous step, the existing data and the signatures
that it should attempt to validate for the next decision. After each step the event
can be rejected if it no longer satisfies any signatures. The same steering software
runs in both offline and online software environments, so the impact of the HLT on
physics analysis can be directly assessed.
Primary authors
Dr
Carlo Schiavi
(University of Genova & I.N.F.N. Genova)
Mr
Gianluca Comune
(Michigan State University)
Dr
Johannes Haller
(CERN)
Dr
Paolo Morettini
(I.N.F.N. Genova)
Dr
Rainer Stamen
(Institute of Physics, University of Mainz)
Dr
Simon George
(Royal Holloway, University of London)
Prof.
Stefan Tapprogge
(Institute of Physics, University of Mainz)
