Dalitz plot of the d-π⁰ versus the π⁰-π⁰ invariant mass squared for the pd → dπ^0π^0 + (spectator proton) interaction, from an experiment by the WASA-at-COSY Collaboration. The experimental results point to the existence of a new, unconventional I = 0, J ^P = 3⁺ resonance in the two-baryon system.

From the article:

Abashian-Booth-Crowe Effect in Basic Double-Pionic Fusion: A New Resonance?
P. Adlarson et al. (WASA-at-COSY Collaboration)
Phys. Rev. Lett. 106, 242302 (2011)

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