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The intrinsic parity of the pion is P = -1 (since the pion is a bound state of a quark and an antiquark, which have opposite parities, with zero angular momentum), and parity is a multiplicative quantum number. Therefore, assuming the parent particle has zero spin, the two-pion and the three-pion final states have different parities (P = +1 and P = -1, respectively). It was thought that the initial states should also have different parities, and hence be two distinct

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