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nuby
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How is strong nuclear force measured?
Something difficult is not necessarilly poor or irrelevant. People are trying to understand the mechanism of quark confinement you know. And the strong coupling constant for instance has been measured not to grow to infinity (which is not a very physical possibility). So, we do know how to make sens of non-perturbative partons.lbrits said:the quark/gluon thing is a very poor description in the strong coupling regime
It's funny, I see it the other way around : at high energy (weak coupling) you have as many partons as you can reach, whereas at large coupling (low energy) you have a definite number of (valence) quarks. Sea quarks can be considered as mesons BTW.lbrits said:it means "far from weak coupling", in the sense that the "good" weak coupling states which have definite quark / gluon number don't look anything like the "good" strong coupling states, which have definite hadron/meson number.
This is the heart of the difficulty actually. Why is the "naive" quark model so predictive (in retrospect) ?Now, there seems to be an effective description of hadrons in terms of valence quarks, but these aren't the quarks that we put into the Lagrangian, and are highly dressed.
It has been measured to saturate, both on the lattice and in the lab.I'm not sure about the coupling constant not growing to infinity.
Indeed, once again the very heart of the question. References upon request. I'd be delighted to discuss that more, since I keep coming again again to this problem.I guess it depends on what you're calling the coupling constant.
There are even in QED already this kind of subtelty. I am not sure this track would help us gain much insight.It's a hard question to ask because the states that go into the S-matrix aren't the same states that participate in the scattering.
Well, one could argue in principle that the values of the proton and neutron magnetic moments is determined by the strong force. But given those values, the strong nuclear forces do not matter in NMR.nuby said:Doesn't NMR involve high power magnets interacting with nucleons (is this the same as strong force)?
nuby said:How is strong nuclear force measured?
What is "strong" in your "strong magnetic field" ?nuby said:How does a strong magnetic field affect protons/neutrons?
humanino said:What is "strong" in your "strong magnetic field" ?
Is it strong like in "big" or strong like in "chromodynamics" ?
Is is indeed possible to talk about the chromomagnetic part of the glue field, but I doubt the question referred to this.
nuby said:Can the strong force between quarks be measured in Newtons?
Would the total binding energy of the 3 quarks in a proton be equal to it's mass-energy?