MC and Parameters

1
MC and Parameters

• Rick St. Denis
• Glasgow University

2
Generation of MC

• Generation (dont store)
• Simulation (dont store)
• ReconstructionStore file
• Stripping
• Ntuples
• Refers to these stages as Tiers.
• There is a heirarchy. Files are stored at a Tier.

3
Parameters

• In each case we store parameters. Parameters are
  relevant to certain categories.
• Generator categories Pythia,Herwig,
• Simulation categories QuickSim, CDFSim
• Reconstruction Production (note RCP)
• The name of a parameter is a type so parameters
  are ltcategorygt.lttypegt

4
What is needed

• Define the parameter categories and types
• Store files with relevant ltcategorygt.lttypegt
  specifying the data tier for the file
• Select sets of files with constraints on
  parameters
• Run AC (that you know) to analyze

5
Definition of Params

• samadmin add parameter --typelamqcd
  --categorypythia --datatiergenerated
• samadmin add dimension mcrun
  --namepythia.lamqcd --categorypythia
  --typelamqcd
• Requires an administrator to enter
• Needed to avoid lamqcd, lambdaqcd,lambda_qcd
  etc.!Should keep the number under control

6
Storage

• sam store --descripmyParam.py --source.
  --dest/pnfs/filesets/
• Where
• myParam.py has
• pythia
• lamqcd 0.200,

7
Selection of files

• Check the list of files
• Sam translate constraints
  --dimpythia.lamqcd 0.200
• Create a dataset definition (aka dataset)
• Sam create dataset --defnamembot04
  --dimpythia.lamqcd 0.200
• GUI also available
• Defname can be anything need to keep it under
  control!
• Do NOT use filename to select datasets!

8
What Exists

• Files have been stored from Glasgow
• Some parameters are defined
• GUI exists for creating dataset definitions

9
What is Needed

• Sensible way to get the parameters out of AC
  and into the description file. (grep for now)
  Turn to Liz
• Specification and definition of all parameters
  and categories MC group
• Assurance that the GUI will not allow mixture of
  files from various generations for now you need
  to take care! SAM Group
• Nonetheless, this can be used now and improved
  based on feedback

10
Advanced thoughts

• Obvious Param names pythia.lamqcd
• What about using the RCP names for modules
  ClusteringRCP jetcone7
• Gives less parameters to type