by Large Hadron Collider (LHC) Compact Muon Coils (CMS) International Collaboration Group in the latest issue of “Nature Physics”Write an articlepointed out that they have mademost accurate measurement: 3.2 MeV. This is in line with Standard Model predictions, but more precise than previous measurements, which only indicated that its width must be less than 9.2 MeV. In the Standard Model of particle physics, the Higgs boson gives mass to all other elementary particles, and was first discovered by the LHC in 2012. But the properties of the Higgs boson are difficult to determine because it decays quickly into other particles and doesn’t always appear with the same mass. In the latest study, the CMS collaboration determined the width of the Higgs boson based on data collected during the second run of the LHC from 2016 to 2018. Their strategy was to compare data on two different processes in which the Higgs boson decays into two other particles. In one process, an unusually massive Higgs boson decays into two Z bosons. In another case, the mass of the Higgs boson is the more common mass predicted by theoretical models. By comparison, the researchers calculated that the Higgs boson might have a width of 3.2 MeV.
