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use outliers in branch stopper

Tim Adye requested to merge adye/athena:adye-ckf53 into main
  • select on maxOutliers in branch stopper and set maxOutliers = 2 to work around outliers being counted as holes.
  • change chi2CutOff = 15 → 25 to match Athena Xi2maxNoAdd.

This change gives large improvement in CPU time.

It also gives us a reduction in efficiency in the transition region, which needs to be understood. In the meantime, we need to update the count references.

Based on #3116. More information from ACTS-ITk meeting.

Edited by Tim Adye

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