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Particle mystery: physicists confirm the muon is more magnetic than predicted

sciencemag.org

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Re: Particle mystery: physicists confirm the muon is more magnetic than predicted

#151
post #115

Alexey Petrov, quoted in the article, subbed in to teach one day in my quantum mechanics class :) It was the first day we were being introduced to the theory of scattering, and I will never forget his intro. He asked the class, “what is scattering?”, waited a moment, and then threw a whiteboard marker against the wall, and answered his own question: “that’s scattering”. Lots of times, physics classes can be so heavy…

I have a theory about how well educated the mass of humans are, could be and should be.

Bear with me.

Roughly 2000 years ago, the number of people who could do arithmetic and writing was Now it is 95% of the world population, and 99.9% of 'Western' world.

Lets say that Alexey Petrov is about as highly educated and trained as any human so far. (A Physics PhD represents pretty much 25 years of full-time full-on education). But most of us stop earlier, say 20 years, and many have less full-on education, perhaps not doing an hour a day of revision or whatever.

But imagine we could build the computing resources, the smaller class sizes, the gamification, whatever, that meant that each child was pushed as far as they could get (maybe some kind of Mastery learning approach ) - not as far as they can get if the teacher is dealing with 30 other unruly kids, but actually as far as their brain will take them.

Will Alexey be that much far ahead when we do this? Is Alexey as far ahead as any human can be? Or can we go further - how much further? And if every kid leaving university is as well trained as an Astronaut, is capable of calculus and vector multiplication, will that make a difference in the world today?

Re: Particle mystery: physicists confirm the muon is more magnetic than predicted

#152

Physics noob question: is there any physical framework that does away with the concept of "force"? I know a bit about how it is reconceptualized as space-time deformation in the context of general relativity, but that's about it. It just seems like one of those inherently anthropocentric concepts that (potentially) holds us back from exploring something different?

> It just seems like one of those inherently anthropocentric concepts that (potentially) holds us back from exploring something different?

This is something I struggle with.

I know that physics originated from an experimental framework. We observe phenomena, then we try to come up with explanations for said phenomena, formulate hypothesis, then test them. That is fine.

But this breaks down when the 'fundamental forces' are involved. What _is_ a force? All the explanations I've ever seen (apart from gravity) seem to treat a 'force' as an atomic concept. They will describe what a force 'does', but not what it 'is'. Maybe that's something unknowable, but it bothers me.

F* magnets, how do they work.

Re: Particle mystery: physicists confirm the muon is more magnetic than predicted

#153
post #115

Alexey Petrov, quoted in the article, subbed in to teach one day in my quantum mechanics class :) It was the first day we were being introduced to the theory of scattering, and I will never forget his intro. He asked the class, “what is scattering?”, waited a moment, and then threw a whiteboard marker against the wall, and answered his own question: “that’s scattering”. Lots of times, physics classes can be so heavy…

I have the opposite experience. Physics classes where always the most interactive and practical. But then again, I only ever studied up to undergrad level physics.

Re: Particle mystery: physicists confirm the muon is more magnetic than predicted

#154

I can't wait for PBS Spacetime to tell me what to think about this.

Am I the only one who barely understands anything from that show?

Every episode I hear a dozen barely explained confusing terms with quantum this and higgs-field that.

I feel like they care more about impressing me with how complicated this stuff is than they do about actually teaching me much. Maybe I'm just not the target audience :(

Re: Particle mystery: physicists confirm the muon is more magnetic than predicted

#155

Honestly feel sorry for particle physicists... Their entire gig is spending billions on fancy equipment, and hoping that observe something unexpected. If they see exactly what they expected to see, all that effort was basically wasted. Also, a lot of "discoveries" turn out to be equipment miscalibration - remember those particles which supposedly moved faster than light a few years back? Always struck me as an odd wa…

The Structure of Scientific Revolutions by Thomas Kuhn lays all this out pretty clearly. The work of "normal science" is to make predictions based on established models and test them until you find something that breaks, then you have a "paradigm shift" that creates a new model.

https://en.wikipedia.org/wiki/The_Structure_of_Scientific_Re...

Re: Particle mystery: physicists confirm the muon is more magnetic than predicted

#156
post #70

Earlier quoted context omitted.

I have indeed often seen the names referred to without the term "nuclear".

Weird. This must have changed in the past 10 years or so, since I've been out of college.

It's something you never get used to. As you get older, this will just keep happening. We used to put commas before the last item in a list back in like the stone ages when I was in school. My SAT score looked really lame for a bit of time when those suddenly changed.

Re: Particle mystery: physicists confirm the muon is more magnetic than predicted

#157
post #147

As someone who has worked in fields that use lattice calculations (on the experimental side), the new calculation is interesting, but I would not say it’s particularly convincing yet. Lattice calculations are VERY difficult, and are not always stable. I am not questioning whether they did their work well or not, just pointing out that in high energy physics and high energy nuclear physics, many times our experimental…

I am not sure I follow the logic. The new computation aligns with the experiment.

Why is it more likely for it to be wrong than the calculation that shows the theory deviating from experiment.

Re: Particle mystery: physicists confirm the muon is more magnetic than predicted

#158
post #115

Alexey Petrov, quoted in the article, subbed in to teach one day in my quantum mechanics class :) It was the first day we were being introduced to the theory of scattering, and I will never forget his intro. He asked the class, “what is scattering?”, waited a moment, and then threw a whiteboard marker against the wall, and answered his own question: “that’s scattering”. Lots of times, physics classes can be so heavy…

would have been even more impressive example with a dusty chalkboard eraser to be able to see the scattering

Re: Particle mystery: physicists confirm the muon is more magnetic than predicted

#160
post #128
post #120

Can anyone explain in layman's terms why this is important?

3D point clouds and x-rays! More research can be done on low-cost devices. It puts LiDAR to shame but there are also great privacy implications. Muon tomography: https://en.wikipedia.org/wiki/Muon_tomography

Extremely precise measurements of the muon magnetic moment are not going to be useful for those applications.
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