Physicists have struggled for seven decades with the question of why there is more matter in the universe than antimatter.

In all, DØ uses 49 different quantities measured on each ... assuming single top quarks are produced at their Standard-Model rate, is 11%. The other two analyses agree with the decision-tree ...

Or not. Thanks to a quirk of quantum physics, four known particles made up of two different quarks—such as the electrically neutral D meson composed of a charm quark and an up antiquark—can ...