A long-standing mystery in particle physics may have just been resolved, but not in the way many scientists had hoped. For years, a key particle seemed to defy the known rules of physics, hinting that the universe might be hiding unknown forces or exotic new particles. Now, new research suggests that the apparent rule-breaking was an illusion, caused by the extreme difficulty of the calculations rather than new physics.
For more than 50 years, measurements of a key property of the muon, a heavier and short-lived relative of the electron, did not match theoretical expectations. This gap fueled speculation that undiscovered physics could be influencing the results.
In a study published in Nature, researchers report one of the most precise calculations ever achieved in the field. Their results show that the Standard Model, which describes the fundamental components of matter, remains accurate.
“There were many calculations in the last 60 years or so, and as they got more and more precise they all pointed toward a discrepancy and a new interaction that would upend known laws of physics,” said Zoltan Fodor, distinguished professor of physics at Penn State and lead author of the study. “We applied a new method to calculate this discrepancy quantity, and we showed that it’s not there. This new interaction we hoped for simply is not there. The old interactions can explain the value completely.”
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