Since the two pion decay is much faster than the three pion decay, | K 1 0 ⟩ was referred to as the short-lived Kaon | K S 0 ⟩ , and | K 2 0 ⟩ as the long-lived Kaon | K L 0 ⟩ . The 1964 experiment showed that contrary to what was expected, | K L 0 ⟩ could decay to two pions. This implied that the long lived Kaon cannot be purely the CP eigenstate | K 2 0 ⟩ , but must contain a small admixture of | K 1 0 ⟩ , thereby no longer being a CP eigenstate. Similarly, the short-lived Kaon was predicted to have a small admixture of | K 2 0 ⟩ . That is,