Keyword
The Fermilab Muon g-2 Collaboration reported its first measurement of the positive muon's anomalous magnetic moment with 0.46 ppm precision. The result was consistent with the earlier Brookhaven measurement, and the combined experimental value showed a tension of about 4.2 sigma with the Standard Model theoretical prediction. This hinted at possible physics beyond the Standard Model.
The ATLAS Collaboration reported the observation of a new neutral boson in searches for the Standard Model Higgs boson, using proton-proton collision data from the LHC corresponding to about 4.8 fb⁻¹ at √s = 7 TeV (2011) and 5.8 fb⁻¹ at √s = 8 TeV (2012). Combining sensitive decay channels, the analysis found an excess at a mass of about 126.0 GeV with a local significance of 5.9 standard deviations, consistent with the production and decay of a Standard Model Higgs boson. The result, announced jointly with a companion CMS measurement, provided experimental confirmation of the boson associated with the Brout–Englert–Higgs mechanism of electroweak symmetry breaking.