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Option to use inv. mass of AB in Dalitz phasespace

Anja Beckrequested to merge
dalitzphsp_mass into master

Add a function MAB(x) to the Dalitz phasespace that returns the "normal invariant mass of AB" (instead of m' from the square Dalitz plane). This is useful when having an acceptance histogram of m(AB) and for example cos(thetaAB):

acceptance_hist.shape( tf.stack([phsp.MAB(x), phsp.CosHelicityAB(x)], axis=1) )

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