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CPAlgorithms: updated experimental OverlapRemoval

Baptiste Ravina requested to merge ravinab/athena:newOR into main

New overlap removal scheme based on the nominal-OR decision, but run also for systematically-varied kinematic selections.

This is for experimental tests only at this stage, tagging @mdubovsk @ekourlit. I tested it locally on a small sample, and I see the intended behaviour in one electron event: the branch el_select_or is set to 1, and at the same time we have el_select_loose_NOSYS (the nominal ID+Iso+Pt+Eta cuts) set to 0, and all but one systematic variations also set to 0. Using the previous setup (run nominal-OR only, and only on the nominal kinematic selection), this electron event is not present at all.

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