Uploaded March 2023 | Updated September 2026, 2 weeks ago
An improved ATLAS measurement of the W boson mass is in line with the #StandardModel of particle physics.
In its new study, @ATLASExperiment reanalysed its 2011 sample of W bosons, improving the precision of its previous measurement. The new W boson mass, 80360 MeV with an uncertainty of 16 MeV, is 10 MeV lower than the previous ATLAS result and 16% more precise. The result is in agreement with the Standard Model. Further measurements of the W boson mass are expected from ATLAS and @CMSExperiment and from @lhcbexperiment, which has also recently weighed the boson.
Find out more: https://home.cern/news/press-release/physics/improved-atlas-result-weighs-w-boson
Contributors
Director:
Jacques Herve Fichet
Co-Producer:
Katarina Anthony
An improved ATLAS measurement of the W boson mass is in line with the #StandardModel of particle physics.
In its new study, @ATLASExperiment reanalysed its 2011 sample of W bosons, improving the precision of its previous measurement. The new W boson mass, 80360 MeV with an uncertainty of 16 MeV, is 10 MeV lower than the previous ATLAS result and 16% more precise. The result is in agreement with the Standard Model. Further measurements of the W boson mass are expected from ATLAS and @CMSExperiment and from @lhcbexperiment, which has also recently weighed the boson.
Find out more: https://home.cern/news/press-release/physics/improved-atlas-result-weighs-w-boson
Contributors
Director:
Jacques Herve Fichet
Co-Producer:
Katarina Anthony
