All Questions
5
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Calculating strong coupling constant $\alpha_s$
I'm trying to find out how to calculate the value of strong coupling constant. but haven't found any exact answer, all I get is reference to perturbation theory.
is there any exact defined formula to ...
- 141
3
votes
2
answers
681
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1
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1
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232
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Why does literature list the strong coupling at the scale of the Z-boson's mass?
In the 2004 edition of the book "QCD as a Theory of Hadrons" by S. Narison, the author provides a value for the strong coupling at a scale of the mass of the Z boson,
$$ \alpha_s (M_Z) = 0.1181 \pm ...
- 2,648
2
votes
2
answers
77
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Error estimation of $\alpha_s$
I have calculated the strong coupling constant $\alpha_s$ using and approximate solution of the Renormalization Group Equation
$$\mu_R^2\frac{d\alpha_s}{d\mu_R^2}=-(b_0 \alpha_s^2 + b_1\alpha_s^3 + ...
- 21
0
votes
1
answer
369
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Connection between QCD Lagrangian and the strong running coupling constant
I know the QCD Lagrangian as well as the running coupling constant for the strong force.
But how are they connected? The Lagrangian should contain the coupling constant, shouldn't it?
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