Particle Physics' Most Famous Anomaly (almost) Solved

Ғылым және технология

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Three years ago, there was a frenzy over an experiment at Fermilab that confirmed anomaly of the muon - a fundamental particle in the standard model. Since then, physicists have debated whether the theory needs to be revised or whether there is something wrong with the calculation. A new paper now says it's neither.
Paper: journals.aps.org/prl/abstract...
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Пікірлер: 484

  • @carlbrenninkmeijer8925
    @carlbrenninkmeijer89252 ай бұрын

    Well, they opened a can of Pions, you mean ?

  • @brb__bathroom

    @brb__bathroom

    2 ай бұрын

    I opened a can of Pringles the other day, same?

  • @colinhiggs70

    @colinhiggs70

    2 ай бұрын

    Well played

  • @Nulley0

    @Nulley0

    2 ай бұрын

    Were they tasty?

  • @carlbrenninkmeijer8925

    @carlbrenninkmeijer8925

    2 ай бұрын

    @@Nulley0 Not really, but it was better than the can of wurms we had a while ago.

  • @brb__bathroom

    @brb__bathroom

    2 ай бұрын

    @@Nulley0 yes.

  • @benjaminshropshire2900
    @benjaminshropshire29002 ай бұрын

    As a software developer, when I hear of this sort of "we found the bug 6 steps back" kind of problem, I start wanting to see the "build graph" for all of physics. It would be an interesting project to try to aggregate all the calculations everything is built on in a form that would allow researchers to re-run them, either in their original form (giving access to all the intermediate values) or in modified form (simplifying checks of how changes in fundamental assumption alter other things).

  • @BANKO007

    @BANKO007

    2 ай бұрын

    It's spread over lots of bottom drawers and shoe boxes.

  • @benjaminshropshire2900

    @benjaminshropshire2900

    2 ай бұрын

    @@BANKO007 I'd love to see people working to fix that.

  • @absalomdraconis

    @absalomdraconis

    2 ай бұрын

    ​@@benjaminshropshire2900: Would be good, yes. Of course, those calculations in many cases have probably _only_ been done by hand, and properly rerunning them all on a computer probably calls for C/C++ for speed, but Prolog for behavior...

  • @rreiter

    @rreiter

    2 ай бұрын

    It's like finding a numerical methods/catastrophic cancellation bug in one of the core statistical packages they all use.

  • @benjaminshropshire2900

    @benjaminshropshire2900

    2 ай бұрын

    @@absalomdraconis Likely true, to some extent, but anything done by hand doesn't need really fast code for a computer to do it in a negligible amount of time. Writing the code is the hard part. (Side note: things like symbolic math manipulations are hard for computers, but even there, it's not that hard to get them to check works that humans already did, e.g. proof checkers.)

  • @jimsvideos7201
    @jimsvideos72012 ай бұрын

    Muon, not to be confused with a spherical cow in a vacuum which is a moo-on.

  • @simongross3122

    @simongross3122

    2 ай бұрын

    They're not spherical. That's just an approximation. The cows exist in a cloud of improbability and can only be detected by injecting a load of bull. You can see that I'm milking this for all I have...

  • @zoetropo1

    @zoetropo1

    2 ай бұрын

    @@simongross3122 Buffalo can you go?

  • @simongross3122

    @simongross3122

    2 ай бұрын

    @@zoetropo1 When I get my wings, maybe

  • @KCUFyoufordoxingme

    @KCUFyoufordoxingme

    2 ай бұрын

    A muon does not distribute it's milk uniformly. It also rotates between whole, %2, and skim.

  • @simongross3122

    @simongross3122

    2 ай бұрын

    @@KCUFyoufordoxingme That's a really good point and thank you for raising it. It probably means that muons don't have spin, but have degrees of skim instead. And it reveals the possibility of other particles such as soyons, almons, etc. These might prove to be virtual and not real, although it might depend on the observer. Then there are other families of particles involving goats or sheep which would give rise to baa-ons. The particle zoo is so exciting!

  • @gregallen485
    @gregallen4852 ай бұрын

    What always made me slightly uncertain/dubious (beyond never having been a physicist nor able to do the math myself ;) about this experiment was, while it was conducted in two different places, Brookhaven and Fermi labs, it was done on the same piece of equipment which was shipped from Brookhaven to Fermi labs. I'm sure that was top on the experimental physicists' minds but wouldn't this cut into the 5 sigma level of certainty?

  • @Mrluk245

    @Mrluk245

    2 ай бұрын

    I have always wondered about this as well. Because its nice that this Equipment predicts the same result with 5sigma but what if there is an general systematic error involved.

  • @inevespace

    @inevespace

    2 ай бұрын

    there are much more experiments than shown in the video. Muonic hydrogen type experiments were like 5-10. Plus few experiments on e^+e^- colliders in Russia and Japan.

  • @-yttrium-1187

    @-yttrium-1187

    2 ай бұрын

    @@Mrluk245 That's precision versus accuracy. The measurements are very precise ( up to 3 sigma) but might not be accurate. Yet the only reasonable way to measure accuracy without reusing similar equipment is to calculate the same property from a different set of axioms. In this case, with the help of the pair of pions. Ofcourse, then you can restate your question of accuracy of the pion/muon experiments compared to any other axiom used in the paper. But the end result will be that eventually, all known experiments will have values that are precise and accurate, at least relative to each other. This is why the meter is defined as the speed of light over time instead of any form of absolute distance that we cannot measure.

  • @O_Lee69

    @O_Lee69

    2 ай бұрын

    And all their experiments operated with anti-muons, not with muons.

  • @davidhiggen3029

    @davidhiggen3029

    2 ай бұрын

    Agreed. It would be a lot more convincing if the equipment had been built from scratch in both cases. This smells like experimental error to me.

  • @thebooksthelibrarian8530
    @thebooksthelibrarian85302 ай бұрын

    For Sabines relativity course on Brilliant: make sure your math is fresh, although a good basis at high school is sufficent (I mean: the schooling from 16 till 18 years, so not higher eduction). However, you have to know how to multiply matrices. Also: after you've done a lesson, study it. You have to grasp it well enough to be able to do the next one. In the beginning it will work out, but especially the later lessons of the course will become hard if you don't know enough of the first ones. Except for that, I would like to see that in a book.

  • @pez4
    @pez42 ай бұрын

    1:13 we engineers be like: that's literaly the same number!!!

  • @MCsCreations
    @MCsCreations2 ай бұрын

    Well, I can only hope this paper was published on 3/14. Thanks, Sabine! 😊 Stay safe there with your family! 🖖😊

  • @drgetwrekt869

    @drgetwrekt869

    2 ай бұрын

    1st April, that is today

  • @alieninmybeverage
    @alieninmybeverage2 ай бұрын

    I have often wondered if one or some combination of the consensus rules of mathematics might begin to introduce noise at these levels of precision. The reason being the difference between proving something is necessarily the case and proving something is necessary for "well-functioning" use of further mathematical approximation.

  • @geraldeichstaedt

    @geraldeichstaedt

    2 ай бұрын

    Physicists often enough have a creative way to interpret mathematical theorems.

  • @LouisEmery
    @LouisEmery2 ай бұрын

    2:04 Funny, I personally know one of the authors right in the middle of the block. He's a geodesist (handles alignment of the instrument). "7" means Fermilab, I assume.

  • @zyxzevn
    @zyxzevn2 ай бұрын

    I love the humor in the presentation.

  • @CANomad27
    @CANomad272 ай бұрын

    Im half way through your book "existential physics" and I'm loving it. Its a nice change up from reading books written buy people who lived 1500 years and ruled roman empires haha. Also, my anxiety has decreased. Its amazing what a little extra understanding of the big picture does for the restless troubled mind.

  • @DigitalRackGear
    @DigitalRackGear2 ай бұрын

    You are an amazing presenter who can breathe life for the 'every-day person' into a highly complex and specialised area. Well done Sabine.

  • @johnkeck
    @johnkeck2 ай бұрын

    It's no coincidence that the problem is PI-ons making the calculation only aROUND the experimental finding.

  • @MassimoAngotzi

    @MassimoAngotzi

    2 ай бұрын

    Your joke deserves better fortune. 👍

  • @simongross3122

    @simongross3122

    2 ай бұрын

    @@MassimoAngotzi This joke should have been made on March 14

  • @e7yu
    @e7yu2 ай бұрын

    I truly enjoy catching up with science news from your channel.👍🤠

  • @jayspell179
    @jayspell1792 ай бұрын

    I love your channel! Your presentation style is charming, and your accent is addictive to what little hearing I still have. Sabine, you have really brightened my days, since I became disabled.

  • @qswaefrdthzg
    @qswaefrdthzg2 ай бұрын

    The problem has been solved for a while, it's called lattice QFT, because it actually works with proper QFT and not just scattering approximations (of course both are perturbative)

  • @hannomzt6833
    @hannomzt68332 ай бұрын

    2:22 does not show the prediction vs the observation. It shows the data-driven result from the new paper vs the previous results obtained from lattice QCD.

  • @alexkaapa

    @alexkaapa

    2 ай бұрын

    exactly! well spotted. lattice-QCD predictions fit well with the measure value in fact

  • @mal2ksc

    @mal2ksc

    2 ай бұрын

    That makes me think they got the slides out of order somehow. That slide clearly belongs, just not at that exact moment.

  • @alexkaapa

    @alexkaapa

    2 ай бұрын

    @@mal2ksc the labeling is wrong though

  • @dboito

    @dboito

    2 ай бұрын

    Having done the plot, I couldn't agree more :)

  • @genessab

    @genessab

    2 ай бұрын

    Yes, good catch!

  • @timhaldane7588
    @timhaldane75882 ай бұрын

    If a mathematician thinks your calculations might be incorrect, it's probably a good idea to check again.

  • @genessab

    @genessab

    2 ай бұрын

    It is definitely important to care more about the quality of our calculations and data, than an end goal new physics scenario! I think this topic is most interesting because of its immediate applications in Lattice QCD, but it’s always good to have that back motivation too!

  • @bjornfeuerbacher5514

    @bjornfeuerbacher5514

    2 ай бұрын

    "If a mathematician thinks your calculations might be incorrect" That's not what happened in this case.

  • @timhaldane7588

    @timhaldane7588

    2 ай бұрын

    @@bjornfeuerbacher5514 but it is. Might I assume you are relatively new to following Sabine?

  • @bjornfeuerbacher5514

    @bjornfeuerbacher5514

    2 ай бұрын

    @@timhaldane7588 "but it is." No, it isn't. Sabine explained in the video that the problem is with _data_ which goes into the calculations. _Not_ with the calculations themselves. Additionally, no mathematicians were involved here, this was a discussion among physicists. "Might I assume you are relatively new to following Sabine?" No, I've been watching her videos for several years.

  • @hhier9395

    @hhier9395

    2 ай бұрын

    Particle physics is not based on solid mathematics, there is a lot of heuristics and hand weaving. This is a fact which most (?) physics are well aware of since decades. However, nobody found a solution since decades. Because the results fits quite well, this pseudo mathematics is usually accepted. The mathematican Folland, the writer of the well estadlished book „Quantum Field Theory: A Tourist Guide for Mathematicans“ calls this „bargin with the devil“.

  • @Thomas-gk42
    @Thomas-gk422 ай бұрын

    My modest physics knowledge literally grew up with this. Is there a calculation for the decay of twitter discussions, too? Navier-Stokes?

  • @aniksamiurrahman6365

    @aniksamiurrahman6365

    2 ай бұрын

    I suspect there is, may be only available to Twitter insiders.

  • @renedekker9806

    @renedekker9806

    2 ай бұрын

    _"Is there a calculation for the decay of twitter discussions, too?"_ - Probably Dunning-Kruger.

  • @Thomas-gk42

    @Thomas-gk42

    2 ай бұрын

    @@renedekker9806 😆

  • @Thomas-gk42

    @Thomas-gk42

    2 ай бұрын

    @@aniksamiurrahman6365I assume, they are still calculating and therefore not to find on those debates.🙃

  • @simongross3122

    @simongross3122

    2 ай бұрын

    Well this is a real problem. The only way to calculate the decay of twitter discussions is to participate in the the twitterverse. This adds uncertainty as the observer becomes an actor and it becomes impossible to work out what would happen without that observation. Oh dear, I've just gone cross-eyed.

  • @41alone
    @41alone2 ай бұрын

    Interesting, keep us informed Doll

  • @hamishfox

    @hamishfox

    2 ай бұрын

    *oboe music plays* I could tell she was bad news as soon as she mentioned statistical analysis, but I guess I always have been a sucker for a dame with with a p-value lower than 0.05... or at least that's what I thought.

  • @wtfatc4556
    @wtfatc45562 ай бұрын

    I love this channel. The nerd in me is sooo happy

  • @nunomaroco583
    @nunomaroco5832 ай бұрын

    Thanks for the explanation, far more complicated than what I think....

  • @modolief
    @modolief2 ай бұрын

    Thanks for the shortened intro theme. PBS Eons also does a good job with this.

  • @justincase5272
    @justincase52722 ай бұрын

    I wonder if the 4.2 sigma deviation in -2 muons corresponds well with the difference in the universe's mass for normal matter as opposed to dark matter and dark energy.

  • @Tesla_Einstein_Newton
    @Tesla_Einstein_NewtonАй бұрын

    Thank you for telling us this wonderful information as a scientist. We hope that the number of scientists who not only focus on their field and work, but also raise awareness of people like you will increase.

  • @henriksundt7148
    @henriksundt71482 ай бұрын

    Thanks for increasing the frequency of your videos - I watch almost every one now - a daily scientific vitamin shot.

  • @meenki347
    @meenki3472 ай бұрын

    It's very easy to solve this problem with a simple new partical, a mewon would fit perfectly.

  • @robertfitzjohn4755

    @robertfitzjohn4755

    2 ай бұрын

    Mewtwo would fit even better!

  • @gfabasic32
    @gfabasic322 ай бұрын

    Always a pleasure.

  • @orthoplex64
    @orthoplex642 ай бұрын

    I wonder if they have tried redoing the calculation over and over with inputs that are slightly different but still within the measurement confidence intervals from experiments

  • @garethdean6382

    @garethdean6382

    2 ай бұрын

    Yes, that was why confidence intervals had to be shrunk,so that we could rule out the possibility that we just had to use values that weren't considered the most likely, but still possible. That took some time but was eventually successful.

  • @simongross3122

    @simongross3122

    2 ай бұрын

    So a sensitivity analysis? I'm sure they wouldn't have forgotten to do that.

  • @newlaty72
    @newlaty722 ай бұрын

    Muon has always been my favorite particle

  • @Hydroverse
    @Hydroverse2 ай бұрын

    I'm just waiting for them to discover the moron alongside lepton, boson, and muon.

  • @RabiesTheBeagle
    @RabiesTheBeagle2 ай бұрын

    Hi Sabine. If you read this comment, I hope you are a friend of the good mood 😊

  • @OkThxBye1

    @OkThxBye1

    2 ай бұрын

    Hi hottie.

  • @georgkrahl56
    @georgkrahl562 ай бұрын

    That's strange. Even in Switzerland - NB outside of CERN - pions are studied now for 40 years. So enough trustworthy data should be around.

  • @pierreabbat6157
    @pierreabbat61572 ай бұрын

    What numerical type did the calculations use? Eight-byte floats have about 17 digits of precision; the accumulated roundoff error could overwhelm the errors in the data. I'd like to get a Power9 box, which has sixteen-byte floats.

  • @jackiscrow
    @jackiscrow2 ай бұрын

    Hi Sabine, huge fan of yours, my Dad and I love watching all your videos together! In my very uneducated opinion it seems as though there are more and more theory’s being proposed that are missing a solid “base”. A “recent” (2010 I believe) example that comes to mind is the theory of Entropic Gravity which is reliant on the assumption that the Holographic Univers theory is correct. How can we attempt to understand how space-time curves if we aren’t even sure what space-time is? (If space is emergent or fundamental, or if it is continuous or discrete) Similar to a point you made about astronomy, where the phrase “something that shouldn’t exist” seems to come up a lot, how can we create a tower of knowledge if we are unsure that we are building on the right base? Thanks for everything you do

  • @garethdean6382

    @garethdean6382

    2 ай бұрын

    An issue is that science isn't like building a tower of knowledge,starting from fundamental true things and adding to it; it's more like inventing new building materials and having to rebuild our houses anew each time. We didn't go from stuff, to atoms to subatomic particles, with each step proceeding logically from the last and adding to what we knew. Instead we asked questions about what we knew, looked for things we couldn't prove and our new discoveries changed what we already knew entirely. We didn't com across atoms because someone saw one and built a theory on it. Rather we took the two options,atoms exist or they don't, and asked what we could look for and find in either case. All theories must start without a solid base, or they'd immediately be proven. First you assume, then you look and test. You search *for* the solid base for your theory and if you find it then everything that came before must be rebuilt according to this new understanding. There should be a multitude of theories with their own strange assumptions;that shows that we are thinking. There should be experiment to test them, that shows we are working. A theory becomes worthless only when people cling to it after it has been shown to be false,something science is certainly not immune to.

  • @Thomas-gk42

    @Thomas-gk42

    2 ай бұрын

    She describes the trouble with mainstream physics and scientific establishment very accurately in her book 'Lost in Math'. Her books are a pleasure to read.💚

  • @drmanhattan71
    @drmanhattan712 ай бұрын

    @SabineHossenfelder finally I can comment on your channel with something more than just fan mail :) When I studied physics at university I actually had Fred Combley as one of my tutors in Sheffield, he was famous (it turned out) for one of the big "muon g-2 experiments" I think in 1974 so 50 years ago this year, he was a lovely lovely man, sadly he died of illness some years ago but I have fond memories of being taught by him, I even had the pleasure of having him as a mentor for my experimental masters project building a water moderated neutron detector.

  • @Clara_linking
    @Clara_linking2 ай бұрын

    \

  • @johnwollenbecker1500
    @johnwollenbecker15002 ай бұрын

    Did they release this on 14 March?

  • @randomguy9241
    @randomguy92412 ай бұрын

    Impressed.

  • @martf1061
    @martf10612 ай бұрын

    2:21 "..testicules.. " 🤫🤣🤣

  • @stephenwilson9872
    @stephenwilson98722 ай бұрын

    Bless you

  • @michaelcornish2299
    @michaelcornish22992 ай бұрын

    I was hoping for new physics but thought it was something like this. So in summary various physicists become pi-eyed after mu-sing over this problem for (of?) a moment...

  • @larry785
    @larry7852 ай бұрын

    These complications are complicated!!!

  • @davesutherland1864
    @davesutherland18642 ай бұрын

    At almost the same time as Fermilab announced the original results for their g-2 result, another team announced the results from a different technique to make the prediction. They claimed their result agreed with the measurement (and there was no discrepancy). I believe it was called the BMW prediction based on the university teams involved. Has there been any advancement in this prediction, or is the prediction discussed here related to the BMW prediction.

  • @williamgidrewicz4775
    @williamgidrewicz47752 ай бұрын

    For all that difficult math those dang muons better have a real good song and dance😊

  • @Mike-yt4jq
    @Mike-yt4jq2 ай бұрын

    Muon research is where it's at!

  • @babyrazor6887
    @babyrazor68872 ай бұрын

    Which would you rather have? 1. the correct answer to a physics problem that has stumped the academic world...or 2. the ability to levitate.

  • @downformexico5470
    @downformexico54702 ай бұрын

    Shortly thought that my local automotive OEM was doing some physics experiment and was disappointed when I saw the original paper

  • @stephenwilson9872
    @stephenwilson98722 ай бұрын

    I love the way you. Sound.

  • @aquahood
    @aquahood2 ай бұрын

    Even Richard Feynman had a problem with infinity and how it's dealt with in mathematics and it's the same today and I really like him due to the fact that he's really humble in the way he speaks and it says it said that he only had an IQ of 128 so that really says something about that particular measure of intelligence.

  • @margaretneanover3385
    @margaretneanover33852 ай бұрын

    Try reversing the analogy input. Use a measure of regular data minus the change, then subtract a full unchanged data from unchanged. Of course it seems simple. If amaebas are the course of balanced energy and not micro organisms, then how many are left to keep a balance sheet? What does the test say about unchanged neurons, neutrons or well you get it. We can ask why it carries special weight. Is it airs filter or growth of the magnetics?

  • @drgetwrekt869
    @drgetwrekt8692 ай бұрын

    its also amazing how these are preoccupied over a 0.000000000000000000x difference, whereas in other fields we are basically at O(1) discrepancy and we are totally fine.

  • @martf1061
    @martf10612 ай бұрын

    3:14 It's pronounced " Let us "

  • @kabaduck
    @kabaduck2 ай бұрын

    Good video

  • @tomarmadiyer2698
    @tomarmadiyer26982 ай бұрын

    This is exciting. A ripple in a pond, that causes an avalanche across the world.

  • @Thomas-gk42

    @Thomas-gk42

    2 ай бұрын

    butterfly-effect

  • @imaginaryangle
    @imaginaryangle2 ай бұрын

    My layman outside impression is that in the last couple of decades there's been an inflation of confidence in fuzzy methods across many scientific disciplines and that there's a lot of cleanup ahead of us.

  • @Thomas-gk42

    @Thomas-gk42

    2 ай бұрын

    Exactly my experience as interested layperson. Reading Sabine's book 'Lost in Math' cleaned up my brain. It explains a lot.

  • @genessab

    @genessab

    2 ай бұрын

    I disagree completely, these dispersive methods and lattice QCD both have very understandable errors, it would be very wrong in my opinion to classify them as “fuzzy” methods. If anything our errors were more conservative, not less.

  • @Thomas-gk42

    @Thomas-gk42

    2 ай бұрын

    @@genessabUnderstand, I think it really depends on the special topic.

  • @imaginaryangle

    @imaginaryangle

    2 ай бұрын

    @@genessab Of course, my stated impression is itself fuzzy and a jumble of many different reports reaching me over the years. I don't have the expertise to personally evaluate the merit of a lot of them, and I'm not confident that it applies in this case. That being said, across many fields of research, especially those of interest to the public, the heuristic of gauging the level of certainty by the confidence expressed in the conclusions doesn't work as well for me as it used to.

  • @martf1061
    @martf10612 ай бұрын

    4:27 I think the step order of the process is wrong. The experimentation step should be the last step. 1- prediction 2- approximation 3- calculation 4- experimentation/testing

  • @jeffryborror4883
    @jeffryborror48832 ай бұрын

    "the muons go in circles until they decay, a process that you can also observe in Twitter discussion". Who says particle physics isn't relevant to everyday life? That guy sporting a spiffy hat and pipe was bohemian.

  • @cherubin7th
    @cherubin7th2 ай бұрын

    1:13 I am afraid of the small misplacement between the two numbers in the graphic.

  • 2 ай бұрын

    Didn‘t I have learned in recent video from Sabine that gravity is *not* a force… 😉

  • @atlantisvelforening
    @atlantisvelforening2 ай бұрын

    Wunderbar news channel 😀

  • @justincase5272
    @justincase52722 ай бұрын

    Lattice Calculations: Bethe? Or others? I would like to hear more!

  • @robdevilee8167
    @robdevilee81672 ай бұрын

    Assumptions are the bane of science.

  • @DanielNistrean
    @DanielNistrean2 ай бұрын

    What I've learned today is that Physicists make a lot of assumptions and this is an easy way to fail. In software development there is a technique called 'branching', we safeguard against the ways our assumptions could go wrong.

  • @jorisv2361
    @jorisv23612 ай бұрын

    Anyone else bothered by the fact that the g-2 (at 1:13) in this video is off by a factor of about 200 million ? There are way too many zeroes after the decimal point AND 0.00116... corresponds to (g-2)/2, not g-2. The forest for the trees...

  • @TheOtherSteel
    @TheOtherSteel2 ай бұрын

    I woke up this morning to two different videos claiming Betelgeuse was going supernova now. I remember thinking, "Oh, Sabine is going to rip these yahoos a new one."

  • @agpc0529
    @agpc05292 ай бұрын

    I didn’t get her before but now I love her

  • @geraldeichstaedt
    @geraldeichstaedt2 ай бұрын

    At some point, the nested Feynman diagrams must be attenuated in order to return a meaningful vacuum energy. Finding a clue for that would mean progress.

  • @guillaumesuchet9263
    @guillaumesuchet92632 ай бұрын

    Wasn't this tension already solved by the BMW calculation of the HVP contribution ? (see 2002.12347)

  • @larscarter7406
    @larscarter74062 ай бұрын

    I saw something on KZread about muons and their decay. The lady said the muons lasted longer than expected while travelling through the atmosphere to hit the earth. If I got it right she said it was because of their speed. They are moving so fast they experience time dilation and don't decay as predicted. She also said something about it was E=mc, and not E=mc squared. So I guess that's why I stay so confused about science stuff. Lol. One channel says this is so and another channel says that is so. I guess I should find another hobby.😊

  • @pgc6290
    @pgc62902 ай бұрын

    I dont get why there are so few fundamental particles. Like why is the universe so simplified.

  • @DrDeuteron

    @DrDeuteron

    2 ай бұрын

    Really only 3 that make stuff, 4 max.

  • @soasertsus

    @soasertsus

    2 ай бұрын

    on the other hand, I don't get why there are so many? whats the point of all the muons and taus and strange quarks when they all just immediately decay into like 3 particles that actually do things. So much additional complexity is just strange when you think about it And then in that case, why only 3 generations? why can't it just keep going up infinitely?

  • @genessab

    @genessab

    2 ай бұрын

    @@soasertsus there could indeed be more generations of matter, their would need to be quite large at this point in order to be suppressed enough that we wouldn’t see their influence in our experiments. But yeah, this question of why there are only 3 generations of matter is one of the most fundamental unsolved problems in particle physics.

  • @charleyhoward4594
    @charleyhoward45942 ай бұрын

    will all this help me get a better fast food Hamberger or what ?

  • @savage5757
    @savage57572 ай бұрын

    1:30 на что распадаются мюоны, они же элементарные частицы, на что распадаются элементарные частицы?!

  • @DarkVoidIII
    @DarkVoidIII2 ай бұрын

    Please don't start a war, I just want the known facts as they pertain to these calculations. I just want to know this, please just stick to the facts and have anyone trying to start a war dealt with in the most unbiased manner that commenters are capable of: Did they use the traditional definition of pi? Or was it 2 pi r Or some other definition that Sabine did not elaborate on in this video?

  • @david_porthouse
    @david_porthouse2 ай бұрын

    Muons and pions have similar masses as compared to protons and neutrons, but they are utterly different from each other. A muon is a simple pointlike entity which only knows the electroweak interaction. A pion is a composite entity apparently made of two quarks which is dominated by the strong interaction. I can well believe that a calculation of the muon g-2 overlooked the contribution made by pions. Is that what has happened?

  • @olibertosoto5470
    @olibertosoto54702 ай бұрын

    The pion ripple effect - or it may turn out to be a tidal wave.

  • @user-pe4bv7vm2y
    @user-pe4bv7vm2y2 ай бұрын

    Whichever way it goes; wrong theory or wrong calculation, this is very exciting!

  • @simongross3122

    @simongross3122

    2 ай бұрын

    There's a third option: Wrong interpretation.

  • @pesilaratnayake162
    @pesilaratnayake1622 ай бұрын

    When your relative error is 0.00019727% and you're worried about it, I'm thinking you're procrastinating on your admin paperwork...

  • @soasertsus
    @soasertsus2 ай бұрын

    This always bothered me honestly, even though I'm far from an expert the desire for what seemed to me to be an obvious mathematical or experimental error to be a gateway to some grand new physics always felt like desperation to me. It seems like physicists just really want there to be more to discover than there is to wiggle out of the uncomfortable thought that we might actually have things mostly figured out with a few small holes to iron out and then what's left is a purely deterministic universe with no free will, no many-worlds multiverses, no extra dimensions, and no special mysteries

  • @robertfitzjohn4755

    @robertfitzjohn4755

    2 ай бұрын

    I strongly suspect that free will is an illusion, and the many-worlds interpretation of quantum theory just sounds silly to me. However, I expect there is still some new Physics to discover, or else proper explanations of dark matter, dark energy and some other phenomena that aren't really understood yet. With any luck there may even be something entirely unexpected, like faster-than-light travel. It wouldn't be the first time that Physics seemed almost completed, only for whole new areas to open up. We won't know unless we look.

  • @zray2937

    @zray2937

    2 ай бұрын

    You missed the part where quantum mechanics is the opposite of being deterministic.

  • @soasertsus

    @soasertsus

    2 ай бұрын

    @@zray2937 Thats one interpretation, the one that leads to most of the seemingly weird contradictory things in quantum physics. Other versions like the pilot wave interpretation are deterministic and the deterministic models seem to iron out a lot of weirdness. I think Sabine even has a video about it.

  • @Thomas-gk42

    @Thomas-gk42

    2 ай бұрын

    ​Yes, she has, and she herself works on superdeterminism to solve the measurement problem. Also she describes the hole error stuff in physics very accurately in her book 'Lost in Math'.

  • @antongromek4180
    @antongromek41802 ай бұрын

    Goes a Muon to a bar... (already funny enough)

  • @steffenbendel6031

    @steffenbendel6031

    2 ай бұрын

    an electron comes out and the neutrino is missing.

  • @simongross3122

    @simongross3122

    2 ай бұрын

    @@steffenbendel6031 And the barman, in error, offers it some pi

  • @georgelionon9050
    @georgelionon90502 ай бұрын

    And I thought the [p]rinciple [i]nvestigators did it..

  • @aquahood
    @aquahood2 ай бұрын

    Or you can also delve into the question of how they deal with infinity!

  • @ramonmerinorojas8535
    @ramonmerinorojas85352 ай бұрын

    Well the point of Lattice is that you do not need that other data that we know is controversial

  • @alex79suited
    @alex79suited2 ай бұрын

    Interesting video, Sabina. Thanks. Peace ✌️ 😎. Lol

  • @alexandersage6261
    @alexandersage62612 ай бұрын

    Let me rewatch and see if I can get a better grasp

  • @k_tell
    @k_tell2 ай бұрын

    "The 𝝅s! The 𝝅s!" - As they say in Liverpool.

  • @user-rv2qx9yy9x
    @user-rv2qx9yy9x2 ай бұрын

    No quizwithit? It's already leaking out of my neurons.

  • @arctic_haze
    @arctic_haze2 ай бұрын

    I was thinking recently about whether this g-2 tension has been resolved. After a short search, I found the possibility that electron-positron collision data may be wrong, a thing Castelvecchi described in his piece in Nature on August 17, 2023. But that came from Novosibirsk, and somehow I do not trust anything Russian, nowadays. Sorry, but I can't. So I definitely prefer the pion solution

  • @carlbrenninkmeijer8925

    @carlbrenninkmeijer8925

    2 ай бұрын

    I am not an expert , but our Russian colleagues in pure Science deserve our respect I think.

  • @arctic_haze

    @arctic_haze

    2 ай бұрын

    @@carlbrenninkmeijer8925 Too many of them support the imperial politics of the Kremlin murderer. I speak Russian so I know what they say to each other. Anyway, this result needs certainly independent confirmation.

  • @carlbrenninkmeijer8925

    @carlbrenninkmeijer8925

    2 ай бұрын

    @@arctic_haze It is all a tragedy ! It is a dark haze for humanity !

  • @arctic_haze

    @arctic_haze

    2 ай бұрын

    @@carlbrenninkmeijer8925 Agreed. By the way, I know you are not a Russian troll. They always vanish if their clown president is mentioned in the way I did 🤡

  • @Mrluk245

    @Mrluk245

    2 ай бұрын

    I cannot see the correlation between politicsl opinions and doing science?

  • @tcl5853
    @tcl58532 ай бұрын

    Cherry pi is my favorite!

  • @alexandersage6261
    @alexandersage62612 ай бұрын

    Wait? So they measured the decay products? Doesn't that release energy? Did they account for that energy or am I missing something about these particles? Like that energy turns into one of the decay products but doesn't release energy?

  • @bjornfeuerbacher5514

    @bjornfeuerbacher5514

    2 ай бұрын

    "Did they account for that energy" What do you mean? This is about a magnetic property, not about energy.

  • @genessab

    @genessab

    2 ай бұрын

    It releases energy in the form of particles, that these detectors are designed to measure. It is very well understood how energetic the muons initially are, and what decays they will go into.

  • @drgetwrekt869
    @drgetwrekt8692 ай бұрын

    if those authors are the Sherlocks of particle physics, who gets the title of "Batman" of theoretical physics?

  • @MyMy-tv7fd
    @MyMy-tv7fd2 ай бұрын

    'a process also observed in Twitter discussions' - love it

  • @sub-critical-fo8mf
    @sub-critical-fo8mf2 ай бұрын

    Maybe there was some editing to condense this video as there seems to be a confusion between the lattice calculation and the data driven estimate where the video makes it sound like these are both steps in one calculation to get the theory prediction. Instead these are two different methods for obtaining theory predictions in the standard model. The data driven prediction gives this very large ( now ~ 5 sigma) deviation from the experimentally measured value, while the lattice result which is fairly new (2020) is closer to the measured value. Since it was the first time a lattice calculation had been carried out at this level of precision the first step was to get comparisons from other lattice collaborations. This happened even more recently so it really looks like there is a tension between lattice and data driven estimates. The new paper is comparing a particular part of that calculation in the data driven method to the same part of the calculation from the lattice method and that has led them to identify a particular contribution as a likely cause of the discrepancy between the data driven method and the lattice result.

  • @dmitripogosian5084

    @dmitripogosian5084

    2 ай бұрын

    And as far as I as told by colleagues, lattice calculations agree with experiments so muon anomaly issue is kind of considered solved for the last few years.

  • @michaelwinter742
    @michaelwinter7422 ай бұрын

    I really like Sabine’s videos, but I’m pretty sure it’s pronounced “sky ants.”

  • @MostlyIC
    @MostlyIC2 ай бұрын

    Sabine, so we really are discovering lots of new forces of nature, not just a fifth force, dark assumptions dark calculations and data dark uncertainty and the sigma for these new forces are so high they're almost inestimable ! enjoy, Pete.

  • @Matthewmest
    @Matthewmest2 ай бұрын

    With each video of Sabine my IQ rise by 10 points

  • @Thomas-gk42

    @Thomas-gk42

    2 ай бұрын

    Haha, that surely is the reason, why she works so hard.😊

  • @DW-indeed
    @DW-indeed2 ай бұрын

    Just hold on there a magnetic moment...

  • @almac4067

    @almac4067

    2 ай бұрын

    If that’s not one of Sheldon’s lines from the Big Bang Theory, it really should have been!

  • @Chronicskillness
    @Chronicskillness2 ай бұрын

    "and that's why people are afraid of particle physics"

  • @petermainwaringsx
    @petermainwaringsx2 ай бұрын

    Well I'm glad they have finally got around to tackling this problem, it has been something the lads down my local have been worrying about. Yeah, I know it's the lowest form of wit. love you really Sabine. 🙂

  • @aquahood
    @aquahood2 ай бұрын

    I find it hilarious how many people actually get their names thrown on these papers now! There are specific rules in scientific methodology about naming conventions and I seriously doubt that every single one of those people actually had a significant role in that actual research!

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