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 ...

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 ...

Top quarks follow the rules of special relativity ... The laws of physics could therefore differ for observers in different frames of reference. That would mean that experimental observations ...