Physicists think they've solved the muon mystery

A landmark physics experiment confirms the Standard Model with unprecedented precision, closing the door on theories of a new fundamental force. | Contesto: cronaca

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• Physicists think they've solved the muon mystery

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A major international collaboration of physicists has announced a definitive resolution to the long-standing "muon mystery," delivering a result that powerfully confirms the Standard Model of particle physics while dashing hopes for evidence of a new, fifth fundamental force of nature. The findings, published this week, stem from the Muon g-2 experiment at Fermilab, which has produced the world's most precise measurement of the muon's magnetic moment, a fundamental property of the subatomic particle. The new data aligns perfectly with the theoretical predictions of the Standard Model, the reigning but incomplete framework that describes the universe's fundamental particles and forces. The so-called "muon mystery" originated over two decades ago with results from the Brookhaven National Laboratory's predecessor experiment. Those measurements suggested the muon's magnetic moment was slightly stronger than what the Standard Model predicted. This tantalizing discrepancy hinted at the influence of unknown particles or forces interacting with the muon, potentially offering a gateway to physics beyond the established theory. The possibility of a fifth force, beyond gravity, electromagnetism, and the strong and weak nuclear forces, captivated the physics community, driving the design and construction of the more powerful Fermilab experiment to settle the question. The latest results from Fermilab, however, have closed that gap with extraordinary precision. By collecting vastly more data and combining it with a monumental, years-long theoretical effort to refine the Standard Model prediction, the collaboration has shown the experimental and theoretical values are now in agreement. "This is a triumph for fundamental physics," said a lead scientist on the experiment. "We have subjected the Standard Model to one of its most stringent tests, and it has passed spectacularly. The precision we have achieved is equivalent to measuring the distance from New York to Chicago to within the width of a human hair." The implications are profound for the field. While the discovery of new physics would have been electrifying, the confirmation of the Standard Model's predictive power at...

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Categoria: cronaca