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

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Experimental constraints on the running of the weak coupling are currently limited, with no definitive evidence supporting either the Standard Model (SM) or the Minimal Supersymmetric Standard Model (MSSM) predictions. The running is expected to change above the electroweak mass, but improvements in data and analysis are needed to clarify the situation. There may be threshold corrections that cause the running of the weak coupling in both the SM and SUSY to appear similar up to around 1 TeV. The discussion emphasizes the need for further research and references to better understand these constraints. Overall, the community is encouraged to share insights and data to advance this area of study.
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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