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CERN's LHC Measures W Boson Mass, Confirms Standard Model

4/13/2026

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Summary

Story summary

The Large Hadron Collider at CERN (LHC) measured the W boson mass as 80,360.2 ± 9.9 MeV, aligning with Standard Model predictions.
The measurement analyzed more than 100 million proton collision events to achieve this precision.
The findings were published in Nature on April 8, 2026.
Some scientists point to discrepancies with prior results from Fermi National Accelerator Laboratory (Fermilab), indicating the need for further investigation.

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Story summary

The Large Hadron Collider at CERN (LHC) measured the W boson mass as 80,360.2 ± 9.9 MeV, aligning with Standard Model predictions.
The measurement analyzed more than 100 million proton collision events to achieve this precision.
The findings were published in Nature on April 8, 2026.
Some scientists point to discrepancies with prior results from Fermi National Accelerator Laboratory (Fermilab), indicating the need for further investigation.