tl:dr Physicists from the CMS experiment at the Large Hadron Collider have announced a new, highly precise measurement of the W boson’s mass, consistent with the Standard Model’s predictions, resolving a long-standing mystery. The mystery arose after a 2022 measurement from Fermilab suggested a different W boson mass, raising questions about potential new physics, but the CMS result now aligns with established theory after nearly a decade of analysis.
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tl:dr Physicists from the CMS experiment at the Large Hadron Collider have announced a new, highly precise measurement of the W boson’s mass, consistent with the Standard Model’s predictions, resolving a long-standing mystery. The mystery arose after a 2022 measurement from Fermilab suggested a different W boson mass, raising questions about potential new physics, but the CMS result now aligns with established theory after nearly a decade of analysis.