Running of the weak coupling

In summary, the conversation was about experimental constraints on the running of the weak coupling. The running is slow and there is no evidence to support either the Standard Model or the MSSM's opposite slopes. Threshold corrections may make the running in both models similar until around 1 TeV. Thank you for sharing and there may be a change in the running above the electroweak mass, but further comments and improvements are still welcome.
  • #1
humanino
2,527
8
Dear all,

would anybody know of references regarding experimental constraints on the running of the weak coupling ? This running is rather slow, and I guess we do not have evidence one way or the other, but since the SM and the MSSM have opposite slopes, I'd like to see what kind of improvement is needed. Also, there might be threshold corrections making the running of the weak coupling in the SM and SUSY quite similar until ~ 1 TeV, I have a hard time to see on huge scale log plots.

Thank you in advance for sharing.
 
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  • #2
After thinking about it, it seems this plot summarizes it all :
qweak_running.jpg

One should expect a change in the running above the electroweak mass but we do not have better yet.

I would still appreciate comments.
 

1. What is "Running of the weak coupling"?

"Running of the weak coupling" refers to the phenomenon in quantum field theory where the strength of the weak nuclear force changes depending on the energy scale at which it is being observed. This is due to the effects of quantum corrections on the coupling constant, which is a measure of the strength of the interaction between particles.

2. How does "Running of the weak coupling" impact particle interactions?

The running of the weak coupling affects the strength of particle interactions at different energy scales. At high energies, the weak nuclear force becomes stronger, while at low energies, it becomes weaker. This can lead to changes in the behavior of particles and the types of interactions they undergo.

3. What causes the "Running of the weak coupling"?

The running of the weak coupling is caused by quantum corrections, which are small fluctuations in the energy of a system due to the inherent uncertainty of quantum mechanics. These corrections can change the value of the coupling constant and therefore the strength of the weak nuclear force at different energy scales.

4. Is the "Running of the weak coupling" a universal phenomenon?

Yes, the running of the weak coupling is a universal phenomenon that occurs in all quantum field theories involving the weak nuclear force. It is a fundamental aspect of the Standard Model of particle physics and has been confirmed through experimental observations.

5. How is the "Running of the weak coupling" calculated and tested?

The running of the weak coupling can be calculated using a mathematical technique called renormalization, which involves removing the effects of quantum corrections. This predicted behavior can then be tested through experiments, such as colliding particles at different energy scales, to see if the observed behavior aligns with the predicted changes in the coupling constant.

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