Speaker
Dr
Paul Laycock
(University of Liverpool)
Description
Over a decade ago, the H1 Collaboration decided to embrace the
object-oriented paradigm and completely redesign its data analysis
model and data storage format. The event data model, based on the
RooT framework, consists of three layers - tracks and calorimeter
clusters, identified particles and finally event summary data -
with a singleton class providing unified access. This original
solution was then augmented with a fourth layer containing
user-defined objects.
This contribution will summarise the history of the solutions used,
from modifications to the original design, to the evolution of
the high-level end-user analysis object framework which is used
by H1 today. Several important issues are addressed - the
portability of expert knowledge to increase the efficiency of
data analysis, the flexibility of the framework to incorporate
new analyses, the performance and ease of use, and lessons
learned for future projects.
Author
Dr
Paul Laycock
(University of Liverpool)
Co-author
Dr
David South
(DESY)
