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Has any one an idea about the loop correction for quartic Higss coupling?

In [arXiv:1507.03618v2 [hep-ph]], equ. (13) it's pointed out that the perturbativity constrains on the quartic couplings in the Higgs potential is ## \lambda^2 < 16 \pi^2 ##

Which means that loop factor is ## \frac{\lambda^2}{(4 \pi)^2}##, but actually I don't why?

Any explanation or refernce about that ?

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# Loop correction for quartic Higgs coupling

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