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Decades-long experiment finds muon still behaving unexpectedly

  • Scientists announced final results from a long-running muon experiment at Fermilab near Chicago on July 20, 2023.
  • The experiment follows unexpected findings from tests in the late 1990s at Brookhaven National Laboratory, where muons behaved strangely.
  • Scientists circulated muons through a magnetic circular path and observed their distinctive oscillations to determine whether their behavior aligns with predictions from the Standard Model.
  • The experiment used over twice the data compared to 2023, and physicist Tova Holmes called it "a huge feat in precision."
  • Scientists continue analyzing data and preparing future tests, aiming to answer fundamental questions about physics and possibly dark matter.
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Different measured values around muons promised a revolution in physics. But the effect can be explained theoretically, also thanks to help from Austria

·Vienna, Austria
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A long-running experiment finds a tiny particle is still acting weird

Final results from a long-running U.S.-based experiment show a tiny particle continues to act strangely -- but that’s still good news for the laws of physics as we know them.

·United States
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U.S. News broke the news in New York, United States on Tuesday, June 3, 2025.
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