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InvariantMassTool: Use TLorentzVector to calcualte the mass

Johannes Junggeburth requested to merge (removed):ATLASRECTS-6135 into master

Hi,

as reported in ATLASRECTS-6135, it could happen that the invariant mass of the two particles becomes very rarely invalid returning a number less than 0. The second item is that the methods in place use lots of float variables and are quite cumbersome given that ROOT already provides lot's of implementations to calculate invariant momenta.

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