Hey I'm getting muddled deciding which forces are responsible in individual particle decays. I'm looking at the hyperphysics page: http://hyperphysics.phy-astr.gsu.edu/hbase/forces/funfor.html Here it says that the photon mediates the EM force. So does that mean that if photons are produced after a decay, the EM force was involved? Then it says that the strong force is mediated by gluons and [tex]\pi[/tex] (nucleons), which I assume means pions(??). So if there are pions involved in a decay, the strong force must be involved? I'm confused because I don't think it can be this straightforward, given that you get decays involving pions and photons. Any advice would be very helpful ! Thanks!