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LHCb data reduction (stripping)

The LHCb computing model foresees that not all events recorded by the data acquisition are made available for physics analysis. After an initial reconstruction of all events, an event selection step (stripping) is executed - this is an analysis job that selects events based on "stripping sekections" provided by the physics groups. Only events passing one or more of these selections are made available for further analysis.

Stripping framework

The stripping framework is a framework based on DaVinci within which the stripping selections are defined. More details are available here

Stripping workflow

The sequence of steps needed to produce a stripped DST ("stripping workflow") is shown in the following picture:

MC09 stripping workflow

What follows describes the workflow used to strip MC09 data, it refers to the picture above

In MC09, the RAW data was produced by Boole v18r1 and the RDST data by Brunel v34r7. In MC production, these datasets are not stored in separate files, they are combined in a single DST file which is the output of the Brunel production step.

Step 1: DaVinci (stripping)
This step reads the RDST from the MC09 production (taken from the MC09 DST files), it runs the default stripping and produces a “full” event tag collection (FETC): it stores the result of the stripping selection for each event on the RDST.

Program version: DaVinci v24r2p1
Options AppConfig/v3r4/options/DaVinci/
Database: SQLDDDB v5r11 with tags:
SIMCOND MC09-20090402-vc-md100
DDDB MC09-20090602

-- MarcoCattaneo - 2009-09-29

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Topic revision: r1 - 2009-09-29 - MarcoCattaneo
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