The InDetExtensionProcessor package

The InDetExtensionProcessor package provides algorithms which form part of the Inner Detector track reconstruction sequence [1].

Currently there is one algorithm, InDet::InDetExtensionProcessor, which is run at the end of the inside-out track finding to evaluate by means of a full track fit if a proposed extension of TRT hits matches with the associated silicon track. Three possible situations are treated in this algorithm:

• For a given Si track no extension is proposed. The original Si track is kept unmodified.
• For a given Si track an extension is proposed, but the track fit failed or gives a worse score than the initial Si track. A new track object is then made with the additional TRT hits added as outlier states and the original Si track fit result.
• For a given Si track an extension is proposed, and the additional hits have improved the track score. The new fit result is kept and a new Track made.

The algorithm is coded in a general way and can work with any combination of original tracks and associated extensions given through a Trk::TrackExtensionMap and with any type of track fitter.

Author

Markus Elsing

References

[1] T. Cornelissen et al., Concepts, Design and Implementation of the ATLAS New Tracking, ATLAS int.comm com-soft-2007_002

Job options for InDet::InDetExtensionProcessor

TrackName

Name of the input Trackcollection in StoreGate. Default: Tracks

ExtensionMap

Name of the input extension map in StoreGate. Default: TrackExtensionMap

NewTrackName

Name of the output Trackcollection under which it shall be written to StoreGate. Default: ExtendedTrack

TrackFitter

Toolhandle for the track fitter. Default: Trk::KalmanFitter

ScoringTool

Toolhandle for the track scorer. Default: Trk::TrackScoringTool

runOutlier

switch whether to run outlier logics or not. Default: True

RefitPrds

switch whether to have the fit re-calibrated the clusters and drift circles (true) or not. Default: False

matEffects

particle hypothesis to assume for material effects in track fit. Default: 4 (pion)

keepFailedExtension

switch whether to keep failed extension as outlier hits on the new track. Default: True

etaBounds

eta intervals for internal monitoring. Default: 0.8, 1.6, 2.1

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