Diagram of the decay of a Λ_b⁰ baryon into a K^- meson and a charmonium pentaquark (P_C⁺) state. Selected for an Editors’ Suggestion and a Viewpoint in Physics.

From the article:

Observation of $J/\psi p$ Resonances Consistent with Pentaquark States in ${\mathrm{\Lambda }}_b^0\to J/\psi K^{-}p$ Decays
R. Aaij et al. (LHCb Collaboration)
Phys. Rev. Lett. 115, 072001 (2015)

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