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AMVF recomissioning: significance-based cut and seed width constraint

Izaac Sanderswood requested to merge (removed):master into master

Added significance-based cut and seed width constraint to adaptive multi vertex finder

Added private member m_tracksMaxSignificance to AdaptiveMultiPriVxFinderTool. Added method to calculate significance of tracks using Trk::TrackToVertexIPEstimator. Updated some output messages to say e.g. "added tracks due to significance"

Created Analytic seed finder interface, which inherits from previous seed finder interface. This allows a seed finder to return a width to use as a constraint for the vertex seed in the fit. Updated Track density seed finder to new analytic seed finder. Updated Gaussian density finder to new interface. Updated AMVF to use constraint. Added some counters and messages that are very useful for debugging.

This update allows the AMVF to use the seed constraint explained in detail in https://cds.cern.ch/record/2670380 and https://cds.cern.ch/record/2679446

Edited by Izaac Sanderswood

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