PAT v2 Conversion Guide

Complete:

How to convert an old config file to the new PAT workflow

Overview

The main differences between the new and the old workflow is that:

• There is no longer a 'layer 0'. there is just:
  • Duplicated Electron and Photon removal, only for 2.2.X (in 3.0.X the POG will take care of it correctly).
  • Some extra reconstruction on top of AOD (e.g. extra electron ids, trigger matching, ...)
• After this step, we produce PAT objects: the allLayer1Objects
• Such objects are then passed through a preselection step: selectedLayer1Objects
• Selected objects are then passed through a cleaning step to produce the cleanLayer1Objects

You can turn off the layer 1 cleaning step with these lines in your config file:

from CMS.PhysicsTools.PatAlgos.tools.coreTools import removeCleaning
removeCleaning(process)

You must then also update your output module configuration to use the patEventContentNoLayer1Cleaning instead of the patEventContent
An example config file is patLayer1_fromAOD_noLayer1Cleaning_full.cfg.py
Note: layer 1 cleaning is of course turned off in the PF2PAT example config files, as the cleaning is performed by the PF2PAT sequence.

Recipe for the impatient user

• remove patLayer1_cff and patLayer0_cff ; load instead patSequences_cff
• remove patLayer1 and patLayer0 replace with patDefaultSequence
• replace the EventContent part

        ##  OLD
        process.load( "CMS.PhysicsTools.PatAlgos.patLayer1_EventContent_cff" )
        process.out.outputCommands.extend( process.patLayer1EventContent )

        ## NEW
        from CMS.PhysicsTools.PatAlgos.patEventContent_cff import *
        process.out.outputCommands += patEventContent

• Warning: patEventContent only contains the PAT Objects. You should add yourself the other AOD objects you want to keep.
• replace PATLayer0Summary with PATSummaryTables in the MessageLogger configuration

Review status

Reviewer/Editor and Date (copy from screen)	Comments
GiovanniPetrucciani - 13 Jan 2009	created page
GiovanniPetrucciani - 26 Jan 2009	updated for cleaning

Responsible: GiovanniPetrucciani
Last reviewed by: GiovanniPetrucciani