Abstract
Complementary to parallel open access and analysis preservation initiatives, ATLAS is taking steps to ensure that the data taken by the experiment during Run-1 remain accessible and available for future analysis by the collaboration. An evaluation of what is required to achieve this is underway, examining the ATLAS data production chain to establish the effort required and potential problems. Several alternatives are explored, but the favoured solution is to bring the Run 1 data and software in line with the equivalent to that which will be used for Run 2. This will result in a coherent ATLAS dataset for the data already taken and that to come in the future.
Highlights
The requirements and plans for analysis preservation is the subject of an ongoing task force that is due to report in summer 2015
For use by third parties, ATLAS is exploring the potential of recasting of analyses as a means of providing a robust mechanism for new physics models to be tested against well-validated analysis chains by nonmembers of the collaboration
Summary
In terms of data sharing for additional research, ATLAS regards the scientific utility as an important consideration, and places its resources into tools that have most likely robust scientific outcome. ATLAS requires both levels of preservation for internal purposes, access to the reprocessing data and environment is limited even within the collaboration, and will not in general be possible for third parties; the long-term preservation does not require the ability for full reprocessing once the experiment is inactive. As ATLAS wishes to be able to make use of old data in future analyses, it regards the additional load of reprocessing with new software to be less than that of back-porting to earlier environments.
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