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Muon g-2 calculations match Fermilab but clash with four decades of collider data
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ScienceBlog.com
Brookhaven National Laboratory reported a measurement in the early 2000s that was higher than the accepted Standard Model prediction.
Even relatively small differences in the measured production rate can noticeably shift the final Standard Model prediction for muon g-2.
Those datasets became the foundation of calculations that left a substantial gap between the Standard Model and the muon experiments.
It means the muon measurement, by itself, no longer provides persuasive evidence that they must exist.
Until that conflict is resolved, the field cannot claim a final Standard Model prediction with precision comparable to Fermilab’s measurement.