News Releases

.

Updates every hour. Last Updated: 25-Aug-2025 08:11 ET (25-Aug-2025 12:11 GMT/UTC)

17-Sep-2024

New results from the CMS experiment put W boson mass mystery to rest

DOE/Fermi National Accelerator Laboratory
Peer-Reviewed Publication

Physicists on the CMS experiment announce the most elaborate mass measurement of a particle that is notoriously difficult to study and has captivated the physics community for decades.