In the meantime, in 2020 a bunch of 170 specialists 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 Normal Mannequin. That reply bolstered 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, stated she didn’t know the end result 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 stated. “We’ve been ready for this for a very long time.”
On the day of the Fermilab announcement one other group, utilizing a unique 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 Normal Mannequin.
“Sure, we declare that there is no such thing as a discrepancy between the Normal Mannequin and the Brookhaven end result, no new physics,” stated Zoltan Fodor of Pennsylvania State College, one of many authors of a report revealed in Nature on Wednesday.
Dr. El-Khadra, who was aware of that work, referred to as it an “superb calculation, however not conclusive.” She famous that the computations concerned had been horrendously difficult, 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 a whole lot of hours of supercomputer time.
These lattice calculations, she stated, wanted to be checked towards unbiased outcomes from different teams to get rid of the potential of systematic errors. For now, the Principle Initiative’s calculation stays the usual by which the measurements can be in contrast.