A Dalitz plot is a graphical representation used in particle physics to visualize the energy and momentum distribution of decay products from a three-body decay process. It is particularly useful for studying the kinematics of interactions involving three particles resulting from the decay of a parent particle. In a Dalitz plot, the axes typically correspond to the invariant masses of pairs of the decay products.
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A display of three-body final states in two independent pairwise squared invariant masses. For a parent of mass decaying into daughters of masses , four-momentum conservation gives . A narrow intermediate two-body resonance fixes one pairwise invariant mass and appears as a band.