Hello, I am startfing to study kaons and I can not understand why (or how) We know that the decay process of k → 2 π is much faster than the K → 3π. In the Griffits´ book he says that: The reason is the energy released is greater. But I don´t get it. Can someone explain me this issue a bit? And, if possible, how could Gell-Mannand Pais predict the conversion between a K° and its antiparticle?