Physics Asked on October 2, 2021
Why there seems to be different conventions of QCD energy scales? Is that due to the running coupling?
For example in Wikipedia https://en.wikipedia.org/wiki/Coupling_constant#QCD_scale:
$$
Lambda_{rm MS} = 218pm24text{ MeV}
$$
and also some search of the article https://inspirehep.net/literature/296684:
$$
Lambda_{rm MS} = 254text{ MeV}.
$$
However, from Lubos and others What is the significance of the QCD scale parameter $Lambda$?, it seems that people also set
$$
Lambda_{rm QCD} = 150text{ MeV}.
$$
So what exactly defines the QCD energy scale?
$$Lambda_{rm MS} text{ vs } Lambda_{rm QCD}?$$
How do they relate to confinement and pion mass?
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