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New jet cleaning variable for LLP search

Andrea Coccaro requested to merge coccaro/athena:JetCleaningSUSY6 into 21.2

A new jet cleaning variable is coded in this MR. The variable itself is not new. It was computed at the analysis level in past releases but the needed information is no longer preserved in derivations.

The variable is called SuperLooseBadLLP. It differs from LooseBadLLP on the cut of negative energy, which was tested and found to be too tight in LooseBadLLP to be working for the SUSY pixel dE/dx analysis.

The variable is added in the official JetSelectorTool and saved in SUSY6 derivation, being the format the analysis relies on.

Tagging @zmarshal and @fmeloni as SUSY conveners, @hoide and @kpachal as SUSY RPV/LL conveners and @ljeanty and @passaggi as analysis contacts.

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