The asymmetry between matter and antimatter in the universe requires processes that violate CP symmetry, which the current Standard Model particles do not sufficiently explain.

“we know that this CP symmetry is broken which is a good thing because if it wasn't we wouldn't be here but the mystery is our current the particles we know about don't break it enough so the Symmetry is is very is only very slightly broken and we need way more of this symmetry breaking”