Egamma Standard Sequences

Complete:
Detailed Review status

Contents

• Electron standard reconstruction sequence
• Photon standard reconstruction sequence
• Conversion standard reconstruction sequence
• Examples of reconstruction code
• Review Status

Electron standard reconstruction sequence

The standard sequence to be executed is electronSequence, defined in electronSequence_cff.py. Actually, this is a referenceing gsfElectronSequence, defined in gsfElectronSequence_cff.py, and the former is made of two modules:

gsfElectronSequence = cms.Sequence(gsfElectronCores*gsfElectrons)

The first module (gsfElectronCores) produces the GsfElectronCoreCollection while the second (gsfElectrons) the GsfElectronCollection.

Worth to note: the reconstruction of electron depends on previous execution of electronGsfTracking, defined in GsfElectronTracking_cff.py. This tracking depends on mixed seeds coming from both egamma and particle-flow, this is why this sequence is not integrated in electron sequence, but defined by tracking and directly integrated into the reconstruction standard sequence. Whatsoever, the egamma subset of seeds is defined in ecalDrivenElectronSeeds_cfi.py, in the same directory as electronSequence_cff.py.

Photon standard reconstruction sequence

The standard sequence to be executed is photonSequence:

photonSequence = cms.Sequence(photonCore+photons)

It is described in photonSequence_cff.py The first module (photonCore) produces the PhotonCoreCollection while the second (photons) the final PhotonCollection. The photonCore stores Ref to conevrsions. So in order for those reference to be corrected attached, the conversionSequence needs to be run prior to the photonSequence as is indeed done in the complete Egamma reco sequence (see http://cmslxr.fnal.gov/lxr/source/RecoEgamma/Configuration/python/RecoEgamma_cff.py

Conversion standard reconstruction sequence

The standard sequence to be executed is conversionSequence:

conversionSequence = cms.Sequence(ckfTracksFromConversions*conversions)

It is described in conversionSequence_cff.py

Examples of reconstruction code

Examples on how to run the above sequences and details on the reconstruction algorithms can be found in: SWGuideElectronRecoSoftware and SWGuidePhotonReco respectively for Electrons and Photons.

Review status

Responsible: DavidChamont and Nancy Marinelli

-- NancyMarinelli - 16 Jun 2009
-- MatteoSani - 06 Apr 2009
-- UrsulaBerthon - 04 Jul 2008