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{{Refimprove|date=February 2013}}
In [[particle physics]] the '''little hierarchy problem''' in the [[Minimal Supersymmetric Standard Model]] (MSSM) is a refinement of the [[hierarchy problem]]. According to [[quantum field theory]], the mass of the [[Higgs boson]] must be rather light for the [[electroweak theory]] to work. However, the loop corrections to the mass are naturally much greater; this is known as the hierarchy problem. New physical effects such as [[supersymmetry]] may in principle reduce the size of the loop corrections, making the theory natural. However, it is known from experiments that new physics such as [[superpartner]]s does not occur at very low energy scales, so even if these new particles reduce the loop corrections, they do not reduce them enough to make the renormalized Higgs mass completely natural. The expected value of the Higgs mass is about 10 percent of the size of the loop corrections which shows that a certain "little" amount of [[Fine-tuning (physics)|fine-tuning]] seems necessary.<ref name="HitoshiMurayama">
{{cite arXiv
|author =Riccardo Barbieri, Alessandro Strumia
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