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Skimming in Zztop

This document outlines the process of implementing skimming and slimming within the ZZtop framework, specifically utilizing the Multiple Stream Manager (MSMgr). It describes creating a derived output stream and integrating algorithms for event selection, which can include various filters and vetoing strategies. The configuration process is streamlined through ZZtop's job options, allowing for easy modification of skimming and slimming flags. Results from running these processes highlight significant data size reductions and emphasize future steps to enhance code efficiency and functionality.

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Skimming in Zztop

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  1. Skimming in Zztop Ricardo – SLT meeting

  2. Skimming in ZZtop • ZZtop updated to do skimming and slimming (only in my area now) • Uses Multiple Stream Manager (MSMgr) • Actually very easy – the basis was already done in ZZtopFilterBase – difficulty was knowing where to look • Need to: • Create a new MSMgr-derived output stream • Add list of algorithms which accept events into stream • Define stream content (which collections get written to stream) • Several ways to select events: • Define list of filter algorithms which can select events (OR) • Define list of filter algorithms which are required to select events (AND) • Define list of algorithms which can veto events (NOT) • Chose to implement the OR, but can be easly changed

  3. Slimming in ZZtop • Several ways to define output stream content: • Add each item (collectio/key) explicitely • Define list of collectio/key to exclude and add all other input collections • Use predefined list of items maintained in convenient functions from PrimaryDPDMaker package

  4. Skimming and slimming configuration • Done through 2 flags and a list in ZZtop_master_jobOptions.py • ZZtopFlags.DoSkimming = True/False • ZZtopFlags.SkimAcceptAlgs= [list of filter algs] • ZZtopFlags.DoSlimming= True/False • Details of e.g. output file content are hidden away in Zztop_master.py as usual – since they should not change often

  5. Some numbers • Pure skimming: • Running on 200 ttbar MC, and asking for 1 electron and 3 jets with pT > 35GeV we get 90 events • No skimming: 104MB (200 events) • Skimming: 53MB (90 events) • Skimming + Slimming: • Adding only basic physics objects to skimmed file: 2MB (90 events) • Adding basic physics + detailed performance & physics objects: 24MB (90 events)

  6. Problems & next steps • Problems: • Somehow adding trigger info to output file with PrimDPD functions doesn’t work • Tried (briefly) to run ZZtop on output file but it didn’t work “out of the box” • Next steps: • Tidy up code and check it in to SVN • Finalize contents of slimmed output file • Make sure we can run ZZtop on slimmed/skimmed dAOD • Run on data

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