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BPVMASSMOMCONSTR (2017-patches)

Mark Smith requested to merge BPVMASSMOMCONSTR_2017_patches into 2017-patches

From !892 (merged) . It was easier to start a new branch

Functor to calculate the invariant mass of a resonance (or any combination of particles), including one missing particle, using the mother mass and flight direction as a constraint.

e.g. M -> A + R, R -> X + B1 + B2 + ..., with M=mother, R=resonance, X=missing.

Can also be used to calculate q2 for semileptonic decays.

@vlisovsk @chefdevi @masmith @mrotondo

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