请问正物质世界和反物质世界用什么办法隔离?

Actually there is no evidence so far to show that the antimatter world exists.Matter is much much more than antimatter that we can almost ignore antimatter.The question:" why matter is so much more than antimatter?" is one of the most fundemental questions of particle physics.
If there is an antimatter world, in the cross section, matter and antimatter would disappear together and send out photons. But we never see this happening.