The matter anti matter asymmetry is still a mystery that still can't be explained. But what if there wasn't an asymmetry? Isn't it possible that there was exactly equal amounts of matter and anti matter which did in fact annihilate each other, and the energy released from it was converted into mass? I know this arises a lot of paradoxes like if so what kind of matter is everything then . I guess what I really want to know more about is, after a Matter and Anti Matter collision, what kind of matter can be created (or rather converted) from the resulting energy outburst?
Energy can indeed transform into matter - for example pair production; but this creates equal amounts of matter and anti-matter.
Many products are created by Matter and Anti Matter collision but is dependent on what matter antimatter that is annihilating. Example electron and a positron annihilate create 2 photons. Proton-anti-proton annihilation produces as many as nine mesons have been observed. If there were equal amounts of matter and antimatter in the beginning we would now see high amounts of gamma rays at the boundary's between regions of matter and antimatter. Which we do not observe. That is my answer.