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BuildTruthTau, move vertex related decorations to float instead of double (part of ATLASG-2741)

Antonio De Maria requested to merge ademaria/athena:vertex_float into main

This MR is going to convert from double to float the truth tau vertex decorations. As discussed in ATLASG-2741, the vertex related variables are natively floats:

https://gitlab.cern.ch/atlas/athena/-/blob/main/Event/xAOD/xAODTruth/xAODTruth/versions/TruthVertex_v1.h#L116

so converting them in double is wrong.

Tagging @martindl, @gwatts , @krumnack , @jcatmore

Edited by Antonio De Maria

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