Fermilab Muon g-2 result

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Fermilab Muon g-2 result

#1  Postby newolder » Apr 05, 2021 11:51 am

The much anticipated result because of beyond-standard-model implications is almost due for release and it's difficult to curb enthusiasm...

Kevin Pitts, Fermilab
Aida El-Khadra, UIUC
Chris Polly, Fermilab
The first results from the Muon g-2 experiment at Fermilab will be unveiled and discussed in a special seminar to be held Wednesday, April 7, 2021, at 10:00 AM US Central Time.

The Muon g-2 experiment searches for telltale signs of new particles and forces by examining the muon’s interaction with a surrounding magnetic field. By precisely determining the magnetic moment of the muon and comparing with similarly exact theoretical predictions, the experiment is sensitive to new physics lurking in the subatomic quantum fluctuations surrounding the muon. A previous experiment performed two decades ago at Brookhaven National Laboratory revealed an intriguing hint of such physics. The highly anticipated result from Fermilab pushes the precision of the experiment into uncharted territory in the quest to confirm or refute that finding.
...


More @ Fermilab source

Further information on g-2 with links to in depth details @ another Fermilab source
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Re: Fermilab Muon g-2 result

#2  Postby newolder » Apr 07, 2021 4:11 pm

There is increased tension between observation and Standard Model predictions on the magnetic moment "g-factor" for Muons.

Brookhaven 2001 result 3.7 sigma
Fermilab Run 1 result 3.3 sigma
Combined result 4.2 sigma

Future runs will improve the statistics (where most of Run 1 error is found)

Conclusion

There is, to increased probability, more to the kit of parts than the Standard Model supplies. Not yet a 5-sigma discovery but such analysis is expected within 18 months from now.

_______________

As ever, there's different views about this and another research group (called BMW) published a paper today in Nature that claims this is a Standard Model prediction, after all...

So writes Natalie Wolchover today at Quanta Magazine

...
However, even as many particle physicists are likely to be celebrating — and racing to propose new ideas that could explain the discrepancy — a paper published today in the journal Nature casts the new muon measurement in a dramatically duller light.
...


More @ Quanta link
I am, somehow, less interested in the weight and convolutions of Einstein’s brain than in the near certainty that people of equal talent have lived and died in cotton fields and sweatshops. - Stephen J. Gould
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