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Option to use inv. mass of AB in Dalitz phasespace

Anja Beck requested 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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