FunTuple DTF_BestPV_PV_X stores position of decay vertex instead of PV
The quantity that FunTuple labels as "Bs_DTF_BestPV_PV_X" etc, is actually the endvertex of the B instead of its origin.
It is not so easy to fix this unless we add something to DTFAlg to access the head of the decay tree. (But see also this issue for what may be an easier way forward.) Until that is fixed, it may be better to remove this altogether.
However, to get access to the PV associated to the particle there is now an easier set of functors. I added 'functorcollections.PrimaryVertexInfo' to add this to FunTuple: https://gitlab.cern.ch/lhcb/DaVinci/-/blob/sevda-v2PV-packing/Phys/FunTuple/python/FunTuple/functorcollections.py#L368 We can eventually extend this with the value of 'F.OWNPV_IPCHI2' which is probably the one functor that is most wanted.