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Measurements

Meanwhile, in 2020, a group of 170 experts known as the Muon g-2 Theory Initiative published a new consensus value of the theoretical value of the muon’s magnetic moment , based on three years of workshops and calculations using the Standard Model. That answer reinforced the original discrepancy reported by Brookhaven.

On the day of the Fermilab announcement another group, using a different technique known as a lattice calculation to compute the muon’s magnetic moment, got a different answer than Dr. El-Khadra’s group, adding a new note of uncertainty to the proceedings.

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Muon's entourage

Muons owe their current fame to a quirk of quantum mechanics, the nonintuitive rules that underlie the atomic realm. Among other things, quantum theory holds that empty space is not really empt...

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Challenge to the Standard Model

The particle célèbre is the muon, which is akin to an electron but far heavier, and is an integral element of the cosmos. Dr. Polly and his colleagues — an international team of 200 physicists from seven countries — found that muons did not behave as predicted when shot through an intense magneti...

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Avoiding human bias

The team had to accommodate another wrinkle. To avoid human bias — and to prevent any fudging — the experimenters engaged in a practice, called blinding, that is common to big experiments. In this case, the master clock that keeps track of the muons’ wobble had been set to a rate unknown to the r...

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Muon behaviour

But they are 207 times as massive as their better-known cousins. They are also unstable, decaying radioactively into electrons and super-lightweight particles called neutrinos in 2.2 millionths of a second.

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On the path to Dark Matter

It might also lead in time to explanations for the kinds of cosmic mysteries that have long preoccupied our lonely species. What exactly is dark matter , the unseen stuff that astronomers say makes up one...

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A fluke ?

A fluke ?

The measurements have about one chance in 40,000 of being a fluke, the scientists reported, well short of the gold standard needed to claim an official discovery by physics standards. Promising signals disappear all the time in science, but more data are on the way. Wednesday’s results represent ...

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What is a Muon ?

Muons are an unlikely particle to hold center stage in physics. Sometimes called “fat electrons,” they resemble the familiar elementary particles that power our batteries, lights and computers and whiz around the nuclei of atoms; they have a negative electrical charge, and they have a property ca...

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g2

This entourage influences the behavior of existing particles, including a property of the muon called its magnetic moment, represented in equations by a factor called g. According to a formula derived in 1928 by Paul Dirac, the English theoretical physicist and a founder of quantum theory, the g ...

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