CERN’s director-general, Rolf Heuer, looks beyond the results announced on 4 July to a wider significance.
The new state is observed with a significance exceeding 5σ and a mass of 5945.0 ± 2.8 MeV.
A new theoretical calculation of the effects of the nuclear medium may account for experimental result that disagreed with the Standard Model.
A look back to the first observation of weak neutral currents.
The measurements gave a value for an electroweak parameter that was three standard deviations higher than predicted by the Standard Model.