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Μesons are unstable hadronic subatomic particles of integral spin, and hence bosons. They are composed of one quark and one antiquark, and bound together by the strong interaction to a physical size of roughly one fermi.

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Why is the decay of a neutral $\rho$ meson into two neutral pions forbidden?

If we look at isospin, $\rho = |1,0\rangle$ and $\pi^0= |1,0\rangle$. Since SU(2) isospin is a really good symmetry in strong interactions, it must be conserved. Looking at the isospin of the final …
David Albandea's user avatar