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In this letter, hadronic decay channels of light pseudoscalar mesons arerealized in Yangian algebra. In the framework of Yangian, we find that thesedecay channels can be formulated by acting transition operators, composed ofthe generators of Yangian, on the corresponding pseudoscalar mesons. This newdescription of decays allows us to present a possible interpretation of the newunknown particle $X$ in the decay $K^0_L\to \pi^0 \pi^0 X$: it is an entangledstate of $\pi^0$ and $\eta$.

Yangian description for decays and possible explanation of $X$ in the decay $K^0_L\to \pi^0 \pi^0 X$