The £º can decay to Aº without changing strangeness, so it decays by the electromagnetic interaction Eº → Aº + y. In contrast, the charged E± decays to p or n by the weak interac- tion with characteristic lifetimes of 10-10 s. Why can’t E± decay to Aº by the strong inter- action in a much shorter time?

The £º can decay to Aº without changing strangeness, so it decays by the electromagnetic interaction Eº → Aº + y. In contrast, the charged E± decays to p or n by the weak interac- tion with characteristic lifetimes of 10-10 s. Why can’t E± decay to Aº by the strong inter- action in a much shorter time?