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Harmonise the tZq and ttZ parton histories

Baptiste Ravina requested to merge ravinab-21.2-patch-59609 into 21.2

Changes are made to two TopPartonHistories within AnalysisTop:

  • for the ttZ topology: the decay products of the Z boson are taken immediately after the decay of the Z boson, instead of going down the radiation chain with findAfterFSR. This changes the definition of these decay products from "bare" to "Born/ME", similarly to what is done in the ttbar topology.
  • for the tZq topology: do the same, except the radiation method there is called findAfterGamma. Also remove calls to findAfterGamma in the arguments of TauIsHadronic, since it itself calls findAfterFSR internally.

Tagging @mdubovsk @thsteven @dellasta @alhroob for the ttZ and tZq analyses.

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