Is there an experiment that shows strong force grows with distance?

[Cody Livengood]

TL;DR Summary

Is there an experiment that shows strong force grows with distance?

Is there an experiment that shows strong force grows with distance?

 

[Vanadium 50]

You posted this in classical physics. What strong force do you mean?

 

[vanhees71]

The "running coupling" of QCD can be measured and agrees pretty well with the predictions of the theory:

https://pdg.lbl.gov/2022/web/viewer.html?file=../reviews/rpp2022-rev-qcd.pdf#chapter.9

 

[Dale]

You posted this in classical physics.

I have moved it to HEP

 

[Drakkith]

Is there an experiment that shows strong force grows with distance?

Yes, there have been trillions of observed collisions at various colliders around the world over the past 70 years or so that support the idea that the strong force either grows or remains constant with distance.

Trillions. This isn't hyperbole or exaggeration.

 

[Cody Livengood]

You posted this in classical physics. What strong force do you mean?

Is there more than one? What are my options?

 

[vanhees71]

Yes, there have been trillions of observed collisions at various colliders around the world over the past 70 years or so that support the idea that the strong force either grows or remains constant with distance.

Trillions. This isn't hyperbole or exaggeration.

Well, QCD is only about 50 years old ;-)). It's of course right, that it is very well established nowadays by all experiments ever made.

 

[Cody Livengood]

The "running coupling" of QCD can be measured and agrees pretty well with the predictions of the theory:

https://pdg.lbl.gov/2022/web/viewer.html?file=../reviews/rpp2022-rev-qcd.pdf#chapter.9

That's a lot of text to read. Help me out. What experiment showed this and how did it show it?

 

[Dale]

Is there more than one? What are my options?

There is the residual strong force. This is the strong force that holds a nucleus together. There is also the strong interaction or color force. This is the strong force that holds a quark together. From context I think that you mean the second one.

 

[malawi_glenn]

That's a lot of text to read. Help me out. What experiment showed this and how did it show it?

Is this also for your school project? Seems to me you want others to do the work for you

 

[Cody Livengood]

Yes, there have been trillions of observed collisions at various colliders around the world over the past 70 years or so that support the idea that the strong force either grows or remains constant with distance.

Trillions. This isn't hyperbole or exaggeration.

How do those observations show that? What physical action did particles make in the experiment to demonstrate this?

 

[vanhees71]

That's precisely told in this article from "Review of Particle Physics". That's why I posted this link. It's the most convenient way to find the state-of-the-art experimental (as well as theoretical results) in HEP physics. On top it's even totally for free. You can even order hard copies of the review as well as the very handy particle-data booklet.

 

[vanhees71]

Is this also for your school project? Seems to me you want others to do the work for you

Well, the Particle Data Group already has done this work for you!

 

[malawi_glenn]

Well, the Particle Data Group already has done this work for you!

PDG is cheat mode!

 

[Cody Livengood]

Is this also for your school project? Seems to me you want others to do the work for you

It's not for school. It's a personal project. I just need a few more questions answered and I should be done with it. And if you're already familiar with what the text says, it's quicker to just ask you to sum it up than to spend the next hour reading something that may or may not actually include the answer I'm looking for.

 

[malawi_glenn]

It's not for school. It's a personal project. I just need a few more questions answered and I should be done with it. And if you're already familiar with what the text says, it's quicker to just ask you to sum it up than to spend the next hour reading something that may or may not actually include the answer I'm looking for.

In the other thread you said you are not doing this for fun?

 

[Drakkith]

Well, QCD is only about 50 years old ;-)). It's of course right, that it is very well established nowadays by all experiments ever made.

Eh, I estimated.

How do those observations show that? What physical action did particles make in the experiment to demonstrate this?

They decayed into jets of particles exactly as predicted by the theory (Quantum Chromodynamics) that says that the strong force doesn't decrease in strength with distance.

If the strong force DID drop off with distance then all sorts of things would be different from what we observe.

 

[Dale]

It doesn't really matter why they are doing this project. This is not a homework-like question so it is on-topic. At the same time, if you want to answer with a solid reference then that is fine.

 

[malawi_glenn]

It doesn't really matter why they are doing this project. This is not a homework-like question so it is on-topic. At the same time, if you want to answer with a solid reference then that is fine.

It would be helpful to know what the OPs own knowledge is and what the ultimate goal is in order to help as best as possible.

 

[Cody Livengood]

In the other thread you said you are not doing this for fun?

Yes, my personal project isn't being done for fun. I've been working at it for over seven years now. I'm doing it to change what the scientific community believes, not for no reason.

 

[Dale]

It would be helpful to know what the OPs own knowledge is and what the ultimate goal is in order to help as best as possible.

Agreed, their background level would be useful, but we don't need to pry into their project.

 

[malawi_glenn]

Yes, my personal project isn't being done for fun. I've been working at it for over seven years now. I'm doing it to change what the scientific community believes, not for no reason.

So it is work on a personal theory?

 

[Dale]

Yes, my personal project isn't being done for fun. I've been working at it for over seven years now. I'm doing it to change what the scientific community believes, not for no reason.

Good luck with that. We can help with what the scientific community believes and why, but we cannot discuss unpublished personal theories here. So stick with questions about standard theories and avoid pushing your own theories. Most of us have already inferred that this is exactly what you are doing, hence the general tone of the responses.

 

[PeroK]

It's not for school. It's a personal project. I just need a few more questions answered and I should be done with it. And if you're already familiar with what the text says, it's quicker to just ask you to sum it up than to spend the next hour reading something that may or may not actually include the answer I'm looking for.

The strong force (QCD) is something of a package, IMO. You have a theoretical infrastructure of quarks, gluons, colour charge, isospin and rules for the way these interoperate and out comes a theory that predicts what will happen in various high-energy experiments. It's difficult or impossible to isolate these components (e.g. a quark) and indeed some of the rules prevent isolation (e.g. colour confinement).

All you can do, really, is test the theoretical package. QCD produces accurate predictions. In a way that's all you can say.

Moreover, I don't think the concept of existence is really very important in physics. All that matters is that something is a useful concept. One example is the classical electromagnetic field. It doesn't matter whether you say it really exists or not. All that matters is that it is a useful concept that is part of the model for classical electromagnetism and that theory works in its domain of applicability.

 

[Drakkith]

My reason for asking the question is irrelevant to the question itself. But if you must know what my knowledge level is, I'm one class away from being halfway done with my physics degree and I work for Boeing's Defense, Space and Security division.

You aren't by chance an author, are you?

 

[malawi_glenn]

Agreed, their background level would be useful, but we don't need to pry into their project.

Its up to them if they want to reply. I just think its good to know what they are going to do with that knowledge. It is for sci fi novel, is it for a lego diorama, or just out of sheer interest

 

[Cody Livengood]

You aren't by chance an author, are you?

Yes. A quick Googling of my name and you could find that out.

 

[Drakkith]

Yes. A quick Googling of my name and you could find that out.

That's exactly what I did, but I figured I'd ask in case it was merely a coincidence that you have the same name as the author of a book that claims that they have a theory of everything that makes more sense than much of science.

 

[Dale]

I am by FAR not the expert on this topic, but assuming that you are talking about the color force, the one responsible for holding protons and neutrons together, the main experimental observation that leads us to believe that the color force grows with distance is the absence of free quarks.

Btw, given your background, the reference posted should be something that you can read and understand.

 

[Cody Livengood]

That's exactly what I did, but I figured I'd ask in case it was merely a coincidence that you have the same name as the author of a book that claims that they have a theory of everything that makes more sense than much of science.

It's not a coincidence, but I don't think we can really discuss my theory here.

 

[berkeman]

It's not a coincidence, but I don't think we can really discuss my theory here.

Correct. But is is being discussed currently in the Mentor forums...

 

[Cody Livengood]

I am by FAR not the expert on this topic, but assuming that you are talking about the color force, the one responsible for holding protons and neutrons together, the main experimental observation that leads us to believe that the color force grows with distance is the absence of free quarks.

Btw, given your background, the reference posted should be something that you can read and understand.

Yes, I can read and understand it.

Correct. But is is being discussed currently in the Mentor forums...

That's alright with me. I'm new to Physics Forums, but if you believe you know of any reason why it can't be true or have anything you want me to clarify, there are less public ways of contacting me where we can discuss it if anyone has any desire to do so. Thanks.

 

[Motore]

Because of this:

I've been working at it for over seven years now.

there should be no:

That's a lot of text to read.

excuses.

 

[Cody Livengood]

I am by FAR not the expert on this topic, but assuming that you are talking about the color force, the one responsible for holding protons and neutrons together, the main experimental observation that leads us to believe that the color force grows with distance is the absence of free quarks.

Btw, given your background, the reference posted should be something that you can read and understand.

The answer that it is because of the "absence of free quarks" is more along the lines of the answer I was looking for. That's something that's actually physical. Thank you.

 

[Drakkith]

The answer that it is because of the "absence of free quarks" is more along the lines of the answer I was looking for. That's something that's actually physical. Thank you.

It's called color confinement. Wikipedia has an article on it if your interested. Have you heard of it before?