Little hierarchy problem

Little hierarchy problem

In MSSM, the little hierarchy problem is a refinement of the hierarchy problem, namely a puzzle whose existence is already pretty well established. According to quantum field theory, the mass of the Higgs boson must be pretty light for the electroweak theory to work. At the same moment, the loop corrections to the mass are naturally much greater which 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 superpartners does not occur at very low energy scales, so even if these new particles reduce the Higgs mass, they do not reduce it enough to make the required value 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 seems necessary.

Particle physicists have different opinions whether the little hierarchy problem is serious.

ee also

*MSSM Higgs Mass


Wikimedia Foundation. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • Hierarchy problem — In theoretical physics, a hierarchy problem occurs when the fundamental parameters (couplings or masses) of some Lagrangian are vastly different (usually larger) than the parameters measured by experiment. This can happen because measured… …   Wikipedia

  • Analytic Hierarchy Process — The Analytic Hierarchy Process (AHP) is a structured technique for helping people deal with complex decisions. Rather than prescribing a correct decision, the AHP helps people to determine one. Based on mathematics and human psychology, it was… …   Wikipedia

  • Clique problem — The brute force algorithm finds a 4 clique in this 7 vertex graph (the complement of the 7 vertex path graph) by systematically checking all C(7,4)=35 4 vertex subgraphs for completeness. In computer science, the clique problem refers to any of… …   Wikipedia

  • Principal-agent problem — In political science and economics, the principal agent problem or agency dilemma treats the difficulties that arise under conditions of incomplete and asymmetric information when a principal hires an agent. Various mechanisms may be used to try… …   Wikipedia

  • Space hierarchy theorem — In computational complexity theory, the space hierarchy theorems are separation results that show that both deterministic and nondeterministic machines can solve more problems in (asymptotically) more space, subject to certain conditions. For… …   Wikipedia

  • MSSM Higgs Mass — The MSSM Higgs Mass is a prediction of the Minimal Supersymmetric Standard Model. Because the Higgs has not yet been found, despite extensive searches, the MSSM has to go to great lengths to make the Higgs sufficiently heavy.The mass of the… …   Wikipedia

  • Grand Unified Theory — For the album, see Grand Unification (album). Beyond the Standard Model …   Wikipedia

  • Physics beyond the Standard Model — Beyond the Standard Model Standard Model …   Wikipedia

  • Minimal Supersymmetric Standard Model — Beyond the Standard Model Standard Model …   Wikipedia

  • Inflation (cosmology) — Inflation model and Inflation theory redirect here. For a general rise in the price level, see Inflation. For other uses, see Inflation (disambiguation). Physical cosmology …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”