- #1

- 41

- 2

## Main Question or Discussion Point

Can someone point me to a reference that explains how the (effective) running coupling behaves in the weak interactions(at 1-loop order). I couldn't find it...

If I understand correctly, than the coupling is [tex]g = \frac{e}{sin(\theta_W)}[/tex] where e is the QED coupling, which increases with energy scale, and [tex]cos \theta_W = M_W / M_Z[/tex] is the Weinberg angle. The vector boson masses are in turn determined by their couplings with the Higgs, and the renormalization group equations will determine the running of these (and other) couplings. Than from that we can get the running of this effective coupling. Can someone tell me where to find the results for such a computation? Is it approximately constant until the electroweak unification or not? If not, how much does it change, etc...

If I understand correctly, than the coupling is [tex]g = \frac{e}{sin(\theta_W)}[/tex] where e is the QED coupling, which increases with energy scale, and [tex]cos \theta_W = M_W / M_Z[/tex] is the Weinberg angle. The vector boson masses are in turn determined by their couplings with the Higgs, and the renormalization group equations will determine the running of these (and other) couplings. Than from that we can get the running of this effective coupling. Can someone tell me where to find the results for such a computation? Is it approximately constant until the electroweak unification or not? If not, how much does it change, etc...