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Difference between coupling constant and strength parameter 
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#1
Aug2514, 09:20 AM

P: 22

Hello to everyone,
I got a little bit confused between the coupling constant [itex]g_W[/itex] and the strength parameter [itex]\alpha_W[/itex] in the weak interaction. For what I know they should both give an idea of the strength of the interaction but I miss to understand what's the difference between them. 


#2
Aug2514, 10:24 AM

P: 1,030

If I understand your quantities well...alpha is called the (running) coupling constant too.
There is no difference between the one or the other... [itex] \alpha_{W}= \frac{g_{W}^{2}}{4 \pi}[/itex] The one appears on the Lagrangian as the coupling strength between the fields on vertices. The other appears in the Feynman diagrams of interactions when you have two vertices. 


#3
Aug2514, 01:59 PM

P: 22

Thank you for the answer!



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