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added TrackClassifierTool (TCT) to FlavorTagDiscriminants pkg: a few updates

Martino Salomone Centonze requested to merge mcentonz/athena:master into 22.0

Following the previously approved MR that integrates a NN classifier of tracks under the FlavorTagDiscriminants area (!52952 (merged)), I updated the tool by including a new function:

  • select_tracks: select tracks according to the heavy flavor output score of the NN, according to the cuts defined in the member vector m_WP_cut. The cuts are tested to reproduce the desired 99% WP efficiency in classifying heavy flavor tracks in singleB jets in the ttbar+Zprime training/test sample used for training b-taggers.

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