Parameterized Muons in the CMSSW Fast Simulation

Complete: 3


Parameterized muons in the FastSimulation aim at providing the muon objects needed in the event selection and analysis (Level 1 muon trigger, Level 3 muon trigger, offline Global Muon) with efficiencies and pT resolutions parameterized on the same quantities of the full simulation. At the moment, the parameterizations are the same as the old FAMOS.

All three muon objects are produced via a single producer, located in the package FastSimulation/ParamL3MuonProducer. They can be enabled separately via control cards in the configuration file. For the L3 and Global muon the reconstructed track must also be produced in advance.

The Parameterized Muon module is defined in FastSimulation/ParamL3MuonProducer/data/ParamL3Muon.cfi and can be accessed through the sequence famosWithMuons available in FastSimulation/Configuration/data/FamosSequences.cff

The L1 muons

Parameterized L1 muons in the FastSimulation are stored as a collection of L1MuGMTCand (L1 Global Muon Trigger candidates).

Parameterization has been done for the pT, eta, phi, charge. Quality is assigned by default as 7 (matched DT-RPC or CSC-RPC, the highest) to all GMT selected cand's.

The L3 and Global muons

Parameterized L3 and Global muons in the FastSimulation are stored as a collection of reco::Muon (which is a reco::RecoCandidate).

The reco::Muon is filled by the following quantities, as a result of the parameterization of the reconstruction efficiency and pT resolution:

  • one LorentzVector → (the smeared four-vector in parameterized muons);
  • the charge → (the same charge as the corresponding tracker track);
  • one vertex → (the same vertex as the corresponding tracker track);

Also, a TrackRef to the tracker track is set (accessible by method track() ).

All other (non mandatory) ingredients of a reco::Muon are not filled at the moment.

Overall configuration cards (with their default values)

  include "FastSimulation/Configuration/data/FamosSequences.cff"

// Debug level
  replace paramMuons.MUONS.Debug = false

// What is to be produced=
  replace paramMuons.MUONS.ProduceL1Muons = true
  replace paramMuons.MUONS.ProduceL3Muons = true
  replace paramMuons.MUONS.ProduceGlobalMuons = true

// Simulate  only simtracks in this eta range
  replace paramMuons.MUONS.MinEta = -2.4
  replace paramMuons.MUONS.MaxEta =  2.4

// The muon simtrack's must be taken from there
  replace paramMuons.MUONS.simModuleLabel = "famosSimHits"
  replace paramMuons.MUONS.simModuleProcess = "MuonSimTracks"

Configuration cards for L3 and Global muons (with their default values)

In addition to what above:

// The reconstruted tracks must be taken from there
  replace paramMuons.MUONS.trackModuleLabel = "gsWithMaterialTracks"

// Set to true if the full pattern recognition was used to reconstruct tracks in the tracker
  replace paramMuons.TRACKS.FullPatternRecognition = false


An example on how to run the producer can be found in FastSimulation/ParamL3MuonProducer/test/FamosTrackProducer_withMuons.cfg.

Parameterized muons in the event can be read with the usual classes (analyzers, etc.) that reads the corresponding data formats in the full simulation: be aware of the missing quantities in the reco::Muon, however!

Review status

Reviewer/Editor and Date (copy from screen) Comments
JennyWilliams - 01 May 2007 created template page

Responsible: AndreaPerrotta
Last reviewed by: Reviewer

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Topic revision: r7 - 2011-05-03 - AndreaPerrotta

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