Speaker
D. Brown
(LAWRENCE BERKELEY NATIONAL LAB)
Description
This talk will describe the new analysis computing model deployed by
BaBar over the past year. The new model was designed to better
support the current and future needs of physicists analyzing data,
and to improve BaBar's analysis computing efficiency.
The use of RootIO in the new model is described in other talks.
Babar's new analysis data content format contains both high and low
level information, allowing physicists to pick a tradeoff between
speed and precision/flexibility appropriate to their analysis.
The new format is customizable, allowing physicists to create
analysis-specific content using simple and familiar tools.
Babar's new analysis processing model involves selecting events
according to their physics content, and writing them together with
analysis-customized content to dedicated output streams.
Currently 120 such 'skims' are written as part of a periodic central
processing cycle. Skims can be further reduced and customized as
well as queried interactively in root-based applications. Skims and
subskims retain links back to the original full event information.
This processing model eliminates the need for large tuple production
efforts by physicists.
The entire BaBar data sample is available in the new format, and the
new model has been used to produce physics results presented at the
summer HEP conferences.
We will also present reactions from the BaBar analysis community,
and describe the issues that arose in deploying the new model.
Primary authors
D. Brown
(LAWRENCE BERKELEY NATIONAL LAB)
D. Lange
(Lawrence Livermore National Lab)
E. Charles
(LAWRENCE BERKELEY NATIONAL LAB)
G. De Nardo
(INFN Naples)
G. Finocchiaro
(INFN Frascati)
L. Wilden
(NIKHEV Amsterdam)
P. Elmer
(Princeton University)
