The DecayFinder package has a settings file found in the python sub folder. The following are explanations of the options found therein: - parentCollectionName: The set of RECO tier tracks to be used when looking for candidate parent track when searching for a decay tuple. - daughterCollectionName: The same thing as the parentCollectionName. Both are set by default to the "generalTracks" collection which contains the most tracks produced in the reconstruction stage. - vertexFitterName: This is currently set to "KalmanVertexFitter". As the Kalman fitter is the golden standard at the moment this is not changeable. It may be in the future though. - doVisualization: If this is set to 1 or 2 then we produce two RECO track collections per event "visParents" and "visDaughters" so that it may be used with the cmsShow application. - dcaCut: This cut is the 3D distance sqrt( x^2 + y^2 + z^2). By default it is set to 1cm (which is large!). The value was chosen based upon a study of DCAs in montecarlo, but is not that useful given the following two cuts... - dcaXYCut: 2D distance in the CMS XY plane. This cut is most important as the resolution in XY is higher than Z. This is set by default to .02cm. Also based upon study. - dcaZCut: 1D distance in Z. Set by default to .1cm. - doDCAPlanarCut: A cut that ensures that the PCA is past the outerpoint on the mother track. This must be set to on for regular running otherwise the Vertex finder will create large numbers of pair of tracks with PCAs near the PV. - doDaughterSanity: checks that a vector from the daughter hits vs PCA compared to the vector formed by the outer mother hit to PCA is positive. Off by default. - parentMinPt: The minimum pt of a prospective parent RECO track. - minDaughterHits- The minimum number of valid hits required on a daughter track - minParentHits- The minimum number of valid hits required on a mother track

By default the DecayFinder package should be run with skim (which removes unnecessary collections). The default (with skim) filtering settings are:

'keep *_generalTracks_*_*' , 'keep *_dedxHarmonic2_*_*', 'keep *_offlineBeamSpot_*_*', 'keep *_offlinePrimaryVertices_*_*', 'keep *_dedxTruncated40_*_*', 'keep *_pfMet_*_*', 'keep *_g4SimHits_*_*', 'keep *_mergedtruth_*_*', 'keep *_siPixelClusters_*_*', 'keep *_siStripClusters_*_*', 'keep *_DecayFinder_*_*',

This filtering setting creates larger files, but allows us to essentially re-do any part of the analysis on the fly. This may be changed in the very near future to move to a lightweight/ultra- lightweight version as many of the basic features of the analysis are set.