Uploaded August 2026 | Updated September 2026, 2 weeks ago
Two competing Standard Model calculations now disagree with each other more than either disagrees with the experiment. That is the real muon g-2 story, not the one that ran in the headlines.
In 2013, a 15-meter superconducting storage ring traveled roughly 5,150 kilometers from Brookhaven on Long Island to Fermilab outside Chicago, by barge around Florida, up the Mississippi, and through the suburbs at 3 a.m. Three thousand people came out to watch it arrive. All of it to measure one number.
In this episode:
- Why g is not exactly 2, and what the deviation at the sixth decimal place is actually made of
- How virtual particles in the vacuum tug on a muon that lives for 2.2 microseconds
- What 127 parts per billion means, and why the 2026 Breakthrough Prize went to three generations of this experiment across CERN, Brookhaven and Fermilab
- Why the hadronic vacuum polarization calculation is harder than the measurement itself
- Lattice QCD versus the electron-positron collider data, and why the CMD-3 result made the disagreement worse rather than better
- What would have to happen for anyone to claim physics beyond the Standard Model
The experiment is finished, and it is not wrong. One of the two theoretical predictions is, and we do not yet know which.
CHAPTERS
00:00 A magnet barged across America. Why?
00:46 What makes a muon special?
01:20 Is g supposed to equal exactly 2?
02:00 What lives and dies in empty space?
02:36 Can a particle leave a clue without being seen?
02:56 How do you catch a wobble at near light speed?
03:56 The first experiment that hinted at something wrong
04:24 3.7 sigma: exciting enough to lose sleep over
05:04 Why move a ring 5,150 kilometres instead of building a new one?
06:04 127 parts per billion: what that precision actually means
06:38 400 scientists. 3 million dollars. One number.
06:50 The calculation harder than the experiment itself
07:36 Two theories. One has to be wrong.
08:06 Is the Standard Model actually broken?
08:24 The door is still open
FOOTAGE
Muon g-2 storage ring transport footage and stills courtesy of Fermi National Accelerator Laboratory and Brookhaven National Laboratory.
Get the transcript, bonus content, and my Monday M.A.G.I.C. Message: briankeating.com/yt
Have a .edu email and live in the USA? You automatically win a meteorite: BrianKeating.com/edu
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Join this channel for perks, monthly Office Hours, and your name in the Member Roster: youtube.com/channel/UCmXH_moPhfkqCk6S3b9RWuw/join
My books:
Losing the Nobel Prize: amzn.to/2sa5UpA
Think Like a Nobel Prize Winner: https://a.co/d/03ezQFu
Focus Like a Nobel Prize Winner: https://a.co/d/hi50U9U
Galileo's Dialogue (first-ever audiobook): https://a.co/d/iZPi9Un
Twitter/X: https://x.com/BrianKeating
Substack: briankeating.substack.com
Blog: briankeating.com/blog
Audio-only: briankeating.com/podcast
Two competing Standard Model calculations now disagree with each other more than either disagrees with the experiment. That is the real muon g-2 story, not the one that ran in the headlines.
In 2013, a 15-meter superconducting storage ring traveled roughly 5,150 kilometers from Brookhaven on Long Island to Fermilab outside Chicago, by barge around Florida, up the Mississippi, and through the suburbs at 3 a.m. Three thousand people came out to watch it arrive. All of it to measure one number.
In this episode:
- Why g is not exactly 2, and what the deviation at the sixth decimal place is actually made of
- How virtual particles in the vacuum tug on a muon that lives for 2.2 microseconds
- What 127 parts per billion means, and why the 2026 Breakthrough Prize went to three generations of this experiment across CERN, Brookhaven and Fermilab
- Why the hadronic vacuum polarization calculation is harder than the measurement itself
- Lattice QCD versus the electron-positron collider data, and why the CMD-3 result made the disagreement worse rather than better
- What would have to happen for anyone to claim physics beyond the Standard Model
The experiment is finished, and it is not wrong. One of the two theoretical predictions is, and we do not yet know which.
CHAPTERS
00:00 A magnet barged across America. Why?
00:46 What makes a muon special?
01:20 Is g supposed to equal exactly 2?
02:00 What lives and dies in empty space?
02:36 Can a particle leave a clue without being seen?
02:56 How do you catch a wobble at near light speed?
03:56 The first experiment that hinted at something wrong
04:24 3.7 sigma: exciting enough to lose sleep over
05:04 Why move a ring 5,150 kilometres instead of building a new one?
06:04 127 parts per billion: what that precision actually means
06:38 400 scientists. 3 million dollars. One number.
06:50 The calculation harder than the experiment itself
07:36 Two theories. One has to be wrong.
08:06 Is the Standard Model actually broken?
08:24 The door is still open
FOOTAGE
Muon g-2 storage ring transport footage and stills courtesy of Fermi National Accelerator Laboratory and Brookhaven National Laboratory.
Get the transcript, bonus content, and my Monday M.A.G.I.C. Message: briankeating.com/yt
Have a .edu email and live in the USA? You automatically win a meteorite: BrianKeating.com/edu
Subscribe: youtube.com/DrBrianKeating?sub_confirmation=1
Support Into the Impossible on Patreon: patreon.com/drbriankeating
Join this channel for perks, monthly Office Hours, and your name in the Member Roster: youtube.com/channel/UCmXH_moPhfkqCk6S3b9RWuw/join
My books:
Losing the Nobel Prize: amzn.to/2sa5UpA
Think Like a Nobel Prize Winner: https://a.co/d/03ezQFu
Focus Like a Nobel Prize Winner: https://a.co/d/hi50U9U
Galileo's Dialogue (first-ever audiobook): https://a.co/d/iZPi9Un
Twitter/X: https://x.com/BrianKeating
Substack: briankeating.substack.com
Blog: briankeating.com/blog
Audio-only: briankeating.com/podcast
