How do collisions occur between different particles when the field excitements that make them are not the same? Also how do you collide when the field are the same? Wouldn't the values of the field just increase until the particles pass through each other? (Like a constructive wave). What I mean by all this is that all fundamental particles are excitations within a field, like the higgs boson, which is an excitation in the higgs field. How would a gluon(strong) interact with a photon(electromagnetic) if the fields they disturb are different?