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Draft: Add DaughtersInLHCbKeepSignalAndParticleWithSamePV algorithm in GenCuts

Xiaoyue Yinrequested to merge
yinx_smog2_with_underlying_particles into Sim10

The SMOG2 MC only keeps signal and its daughters in the event by using GenCuts/DaughtersInLHCbKeepOnlySignal. For example, when a \D^0 is generated, MC only store the D^0 and its daughter K^- and \pi^+ without any other particles which should be produced in one event and one PV simultaneously (another charm hadron or it's daughter).

To meet the actual requirements, a new algorithm DaughterInLHCbKeepSignalAndParticleWithSamePV is added based on the DaughtersInLHCbKeepOnlySignal. It stores particles (and their daughters in acceptance) those have the same production vertex as the signal particle.

Edited by Xiaoyue Yin

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