In the meantime, in 2020 a gaggle of 170 consultants often known as the Muon g-2 Principle Initiative revealed a brand new consensus worth of the theoretical worth of muon’s magnetic second, based mostly on three years of workshops and calculations utilizing the Customary Mannequin. That reply strengthened the unique discrepancy reported by Brookhaven.
Reached by telephone on Monday, Aida X. El-Khardra, a physicist on the College of Illinois and a co-chair of the Muon g-2 Principle Initiative, mentioned she didn’t know the outcome that Fermilab can be asserting two days later — and she or he didn’t wish to, lest she be tempted to fudge in a lecture scheduled simply earlier than the official unveiling on Wednesday.
“I’ve not had the sensation of sitting on sizzling coals earlier than,” Dr. El-Khadra mentioned. “We’ve been ready for this for a very long time.”
On the day of the Fermilab announcement one other group, utilizing a distinct approach 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 Customary Mannequin.
“Sure, we declare that there isn’t any discrepancy between the Customary Mannequin and the Brookhaven outcome, no new physics,” mentioned Zoltan Fodor of Pennsylvania State College, one of the authors of a report revealed in Nature on Wednesday.
Dr. El-Khadra, who was conversant in that work, referred to as it an “superb calculation, however not conclusive.” She famous that the computations concerned have been horrendously difficult, having to account for all doable ways in which a muon may work together with the universe, and requiring 1000’s of particular person sub-calculations and lots of of hours of supercomputer time.
These lattice calculations, she mentioned, wanted to be checked towards impartial outcomes from different teams to eradicate the chance of systematic errors. For now, the Principle Initiative’s calculation stays the usual by which the measurements will likely be in contrast.
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