The top quark decays into a bottom quark and a W boson in the time it takes light to travel just 0.1 femtometre – a fraction of the size of the particle itself. Toponium would therefore be unique ...

“It is the heaviest particle, which gives it an unusual connection to the Higgs boson.” Recently, Grohsjean and his colleagues published an analysis that looks at collisions that generate two top ...