STNTUPLE Data Blocks

STNTUPLE ROOT file has multiple branches. Each branch corresponds to a data block - container for Mu2e data objects.

Currently implemented are the following data blocks

TCalDataBlock              stores calorimeter hits

TGenpBlock                 stores generated MC particles

TSimpBlock                 stores particles simulated by G4

TStnHeaderBlock            stores event header

TStnTrackBlock             stores track collections (mu2e::KalRepCollection's)

TStnClusterBlock           stores mu2e::Cluster collections

TStnTimeClusterBlock       stores mu2e::TimeCluster collection

TStnHelixBlock             stores mu2e::Helix collections

TStepPointMCBlock          stores mu2e::StepPointMC collections

TStnTrackSeedBlock         stores mu2e::TrackSeed collections

TStrawDataBlock            stores mu2e::StrawHit data

TTrackStrawHitBlock        stores straw hits associated with tracks

TVdetDataBlock             stores hits on virtual detectors

Each data block normally contains some book-keeping information and a list of objects, for example, number of tracks and a list of tracks.

Data blocks are written out in split mode with split=1. This means that one could plot distribution for the number of tracks in 'click mode', however plotting distributions for track parameters requires using stnana.

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