CMS Experiment at W Boson Mass Consistent with Standard Model

New high-precision measurement aligns with previous results, challenging earlier anomaly from Fermilab's Tevatron.

The CMS collaboration at CERN has reported a new measurement of the W boson mass at 80,360.2 MeV with an uncertainty of 9.9 MeV.
This result is consistent with the Standard Model of particle physics and aligns with previous measurements, except for the 2022 CDF result from Fermilab.
The CDF experiment at Fermilab had earlier measured the W boson mass at 80,433.5 MeV, suggesting a potential deviation from the Standard Model.
The CMS measurement is the most precise W boson mass determination at the Large Hadron Collider and confirms the robustness of the Standard Model.
Physicists continue to investigate the discrepancy between the CMS and CDF results, emphasizing the need for further studies to understand the difference.