Coupling Constant - QCD Scale

In quantum chromodynamics (QCD), the quantity Λ is called the QCD scale. The value is

This value is to be used at a scale above the bottom quark mass of about 5 GeV. The meaning of ΛMS is given in the article on dimensional transmutation.

The proton-to-electron mass ratio is primarily determined by the QCD scale.

Read more about this topic:  Coupling Constant

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