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Event data model


The DØ event data model (EDM) is a library of C++ classes and templates
whose purpose is to support the implementation of reconstruction and analysis
software.

The central feature of the EDM is the event, a class that represents the results
of a single beam crossing. The event acts as a container to manage all of the
data associated with a single crossing: the raw output of the detector, the
results of trigger processing, and the results of many different reconstruction
tasks. Each of the items in this collection contains both the data describing
the crossing in question as well as metadata that describe the configuration
of the program that constructed these results. This allows us to run multi-
ple instances of single algorithms with different configuration information (for
example, several cone-based jet algorithms with different cone radii), and to
distinguish between the output of these different algorithms. The EDM also
provides a mechanism for access to the collected reconstruction results, re-
lieving the users from the burden of understanding the somewhat complex
internal organization required for the management of the event data and the
corresponding metadata
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