What Are the Experimental Constraints on the Running of the Weak Coupling?

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SUMMARY

The discussion centers on the experimental constraints regarding the running of the weak coupling in the Standard Model (SM) and the Minimal Supersymmetric Standard Model (MSSM). Participants highlight the slow nature of this running and the contrasting slopes of the SM and MSSM. There is a consensus that threshold corrections may cause the running of the weak coupling in both models to appear similar up to approximately 1 TeV. The need for improved experimental evidence and analysis above the electroweak mass is emphasized.

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  • Understanding of the Standard Model (SM) of particle physics
  • Familiarity with the Minimal Supersymmetric Standard Model (MSSM)
  • Knowledge of weak coupling and its implications in particle physics
  • Experience with logarithmic scale plots in theoretical physics
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  • Research experimental methods for measuring weak coupling constants
  • Study the implications of threshold corrections in particle physics
  • Explore the differences in running coupling constants between SM and MSSM
  • Analyze data from particle accelerators regarding electroweak mass thresholds
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Physicists, researchers in particle physics, and students studying the Standard Model and its extensions, particularly those interested in the implications of weak coupling and experimental constraints.

humanino
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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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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.
 

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