Dalitz plot for the Λ _c⁺ -> pK^- π⁺ decay, showing the estimated efficiency from Monte Carlo statistics with invariant mass squared values of K^-π⁺ versus pK^- .

From the article:

First Observation of the Doubly Cabibbo-Suppressed Decay of a Charmed Baryon: ${\mathrm{\Lambda }}_c^{+}\to p{K}^{+}{\pi }^{-}$
S. B. Yang et al. (Belle Collaboration)
Phys. Rev. Lett. 117, 011801 (2016)

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