The ATLAS collaboration measured the W-boson width at the LHC for the first time. The W-boson width had previously been measured at CERN’s LEP collider and Fermilab’s Tevatron collider. This is the most precise measurement to date made by a single experiment, and—while a bit larger—it is consistent with the Standard-Model prediction to within 2.5 standard deviations.

CERN’s accelerators and the LHC’s detectors have undergone major upgrades that will allow scientists to collect more data in the upcoming run than they did in the previous two runs combined.