InvariantMassTool: Use TLorentzVector to calcualte the mass

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.

This merge request affects 1 package:

• PhysicsAnalysis/DerivationFramework/DerivationFrameworkTools

This merge request affects 2 files:

• PhysicsAnalysis/DerivationFramework/DerivationFrameworkTools/DerivationFrameworkTools/InvariantMassTool.h
• PhysicsAnalysis/DerivationFramework/DerivationFrameworkTools/src/InvariantMassTool.cxx

added Derivation master review-pending-level-1 labels

CI Result SUCCESS (hash 3b203548)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis	DetCommon
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
DetCommon: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 30820]

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit 73befee8

added sweep:ignore label