# Hierarchy problem and quadratic corrections in the Standard Model

In this paper, the third paragraph of the “Introduction” says that the Standard Model by itself is a natural theory. As I understand, they say there is no quadratic divergence in the Standard Model unless it is extended. But if I understand the gauge hierarchy problem correctly, then it is a problem with the minimal Standard Model where the Higgs mass receives a radiative correction quadratic in the cut-off $\Lambda$. I don't know why they say that the hierarchy problem arises only when the SM must be extended with extra particles?

Those who write than the Standard Model (SM) is natural interpret it as a fundamental theory, rather than an effective theory or effective field theory, with an unphysical cut-off taken to infinity, $\Lambda\to\infty$.