Meanwhile, in 2020 a gaggle of 170 consultants often known as the Muon g-2 Theory Initiative revealed a new consensus value of the theoretical value of muon’s magnetic moment, based mostly on three years of workshops and calculations utilizing the Standard Model. That reply bolstered the unique discrepancy reported by Brookhaven.

Reached by telephone on Monday, Aida X. El-Khardra, a physicist on the University of Illinois and a co-chair of the Muon g-2 Theory Initiative, mentioned she didn’t know the consequence that Fermilab could be asserting two days later — and he or she didn’t need to, lest she be tempted to fudge in a lecture scheduled simply earlier than the official unveiling on Wednesday.

“I have not had the feeling of sitting on hot coals before,” Dr. El-Khadra mentioned. “We’ve been waiting for this for a long time.”

On the day of the Fermilab announcement one other group, utilizing a unique method often known as a lattice calculation to compute the muon’s magnetic second, concluded that there was no discrepancy between the Brookhaven measurement and the Standard Model.

“Yes, we claim that there is no discrepancy between the Standard Model and the Brookhaven result, no new physics,” mentioned Zoltan Fodor of Pennsylvania State University, one of the authors of a report published in Nature on Wednesday.

Dr. El-Khadra, who was accustomed to that work, known as it an “amazing calculation, but not conclusive.” She famous that the computations concerned have been horrendously sophisticated, having to account for all doable ways in which a muon might work together with the universe, and requiring hundreds of particular person sub-calculations and tons of of hours of supercomputer time.

These lattice calculations, she mentioned, wanted to be checked towards unbiased outcomes from different teams to eradicate the likelihood of systematic errors. For now, the Theory Initiative’s calculation stays the usual by which the measurements might be in contrast.



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