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3.2 Data Formats and Data Tiers

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  Reconstruction is expensive in terms of CPU and is dominated by tracking. The RECO data-tier will provide compact information for analysis to avoid the necessity to access the RAW data for most analysis. Following the hierarchy of event reconstruction, RECO will contain objects from all stages of reconstruction. At the lowest level it will be reconstructed hits, clusters and segments. Based on these objects reconstructed tracks and vertices are stored. At the highest level reconstructed jets, muons, electrons, b-jets, etc. are stored. A direct reference from high-level objects to low-level objects will be possible, to avoid duplication of information. In addition the RECO format will preserve links to the RAW information.
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The RECO data includes quantities required for typical analysis usage patterns such as: track re-finding, calorimeter reclustering, and jet energy calibration. The RECO event content is documented in the Reference Manual at RECO Event Content, RECO data tier.
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The RECO data includes quantities required for typical analysis usage patterns such as: track re-finding, calorimeter reclustering, and jet energy calibration. The RECO event content is documented in the Offline Guide at RECO Data Format Table.
 

AOD

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  The AOD data tier will contain physics objects: tracks with associated Hits, calorimetric clusters with associated Hits, vertices, jets and high-level physics objects (electrons, muons, Z boson candidates, and so on).
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Because the AOD data tier is relatively compact, all Tier-1 computing centres are able to keep a full copy of the AOD, while they will hold only a subset of the RAW and RECO data tiers.
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Because the AOD data tier is relatively compact, all Tier-1 computing centres are able to keep a full copy of the AOD, while they will hold only a subset of the RAW and RECO data tiers. The AOD event content is documented in the Offline Guide at AOD Data Format Table.
 

Reference Documentation for RECO and AOD Data Format Packages

 
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