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Anomalous Magnetic Moment of Muon Even More Anomalous - Possible New Force of Nature

Discussion in 'Physical & Life Sciences' started by essentialsaltes, Apr 8, 2021.

  1. essentialsaltes

    essentialsaltes Stranger in a Strange Land

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    Muons: 'Strong' evidence found for a new force of nature

    There is currently a one in a 40,000 chance that the result could be a statistical fluke - equating to a statistical level of confidence described as 4.1 sigma.

    A level of 5 sigma, or a one in 3.5 million chance of the observation being a coincidence, is needed to claim a discovery.

    Prof Mark Lancaster, who is the UK lead for the experiment, told BBC News: "We have found the interaction of muons are not in agreement with the Standard Model [the current widely-accepted theory to explain how the building blocks of the Universe behave]."

    The experiment, based at the Fermi National Accelerator Laboratory (Fermilab) in Batavia, Illinois, searches for signs of new phenomena in physics by studying the behaviour of sub-atomic particles called muons.

    The Muon g-2 experiment involves sending the particles around a 14-metre ring and then applying a magnetic field. Under the current laws of physics, encoded in the Standard Model, this should make the muons wobble at a certain rate.

    Instead, the scientists found that muons wobbled at a faster rate than expected. This might be caused by a force of nature that's completely new to science.

    --

    Per the "g-2" wiki link: A new experiment at Fermilab called "Muon g−2" using the E821 magnet will improve the accuracy of this value.[11] Data taking began in March 2018 and is expected to end in September 2022.[12] An interim result released on April 7, 2021[13] yields [​IMG] which, in combination with existing measurements, gives a more precise estimate [​IMG], exceeding the Standard Model prediction by 4.2 standard deviations.
     
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  2. SelfSim

    SelfSim A non "-ist"

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    Hmm .. interesting .. that'll raise a few eyebrows!
     
  3. Strathos

    Strathos No one important

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    I assume they've taken external magnetic fields into account.
     
  4. durangodawood

    durangodawood Dis Member

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    It would be funny if they discovered an actual "centrifugal force".
     
  5. FrumiousBandersnatch

    FrumiousBandersnatch Well-Known Member

    +6,086
    Atheist
    The plot thickens - a new supercomputer calculation by the BMW Group, based on the Standard Model, has produced a result closer to the empirical value than the International Group's prediction...

    See 'What's Up With Muons?' from Sixty Symbols.

     
  6. Ponderous Curmudgeon

    Ponderous Curmudgeon Member

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    And I just posted something on the demise of the Aether theory and here we have another one :)

    Anyhow thank you for a very entertaining 30 minutes away from cleaning my living room.

    Not to mention carrot sprout soup? LOL
     
  7. FrumiousBandersnatch

    FrumiousBandersnatch Well-Known Member

    +6,086
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    I don't follow - this isn't an aether theory...

    You're welcome :)

    ??
     
  8. sfs

    sfs Senior Member

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    Okay, semi-pedantry here, but that's not right. A 4.1 sigma result means there is a 1 in 40,000 chance that if you made a measurement of g-2 and it really matched expectation, you'd get a result this far from the expected value. That's actually quite a different value than the probability that the observed result is nothing but a fluke. To calculate the latter, you have to know how likely genuine anomalies or, or equivalently, what the prior probability of a non-standard result is.
     
  9. Tinker Grey

    Tinker Grey Wanderer Supporter

    +3,307
    Atheist
    This video (at the this time code) addresses this "new force", why they are excited, why they are cautious, etc. It is both informative (and covers the 1/40000 stuff, too) and implicitly describes the scientific process. And too, why scientists enjoy the mystery, majesty of reality and why being found wrong is exciting. (The rest of the video is worth a watch, too.)

    N.B. She's a PhD in Astrophysics.

     
  10. Ponderous Curmudgeon

    Ponderous Curmudgeon Member

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    (at the this time code)=11:30
     
  11. Tinker Grey

    Tinker Grey Wanderer Supporter

    +3,307
    Atheist
    Thanks. I intended to link it with the time code. Lost it in the cut & paste I guess.
     
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