✎ natural_unnatural [Jesse Thaler]

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====== (Un)natural Model Building ======

The principle of naturalness asserts that quantum corrections should be not much larger than semi-classical expectations.  Naturalness is not needed for the theoretical consistency of particle physics, but in the past, apparent breakdowns of naturalness have often been resolved by discovering new natural theories of the universe.  

Today, the most important application of naturalness is to the Higgs boson.  In the standard model, the quantum corrections to the mass of the Higgs are 19 orders of magnitude larger than the semi-classical expectation.  This suggests that there should be a natural extension of the standard model in which the quantum corrections are better under control.  Supersymmetry is the most popular natural extension of the standard model, and in yada.

===== The Dark Top =====

//Fall 2007 - Spring 2008//

===== Flavor at the LHC =====

//Spring 2007//

  * **Probing Minimal Flavor Violation at the LHC**.\\  Yuval Grossman, Yosef Nir, Jesse Thaler, Tomer Volansky, and Jure Zupan. \\ [[http://www.arxiv.org/abs/0706.1845|arXiv:0706.1845]], [[http://link.aps.org/abstract/PRD/v76/e096006|Phys. Rev. D76:096006 (2007)]].

===== Natural/Unnatural =====

//Fall 2006 - Winter 2007//

  * **Natural Dark Matter from an Unnatural Higgs Boson and New Colored Particles at the TeV Scale**.\\ Aaron Pierce and Jesse Thaler.  \\ [[http://www.iop.org/EJ/abstract/1029-8479/2007/08/026|JHEP 0708:026 (2007)]], [[http://arxiv.org/abs/hep-ph/0703056|hep-ph/0703056]].

===== Di-Higgs at Dimension Six =====

//Summer 2006//

The Higgs boson is the most anticipated new particle for potential discovery at the LHC.  Yada.

  * **Disentangling Dimension Six Operators through Di-Higgs Boson Production**.\\ Aaron Pierce, Jesse Thaler, and Lian-Tao Wang. \\ [[http://www.iop.org/EJ/abstract/1029-8479/2007/05/070|JHEP 0705:070 (2007)]], [[http://arxiv.org/abs/hep-ph/0609049|hep-ph/0609049]].

===== Prospects for Mirage Mediation =====

//Spring 2006//

In order for a supersymmetric extension of the standard model to be viable, supersymmetry must be broken.  Moreover, SUSY breaking must be communicated to the standard model in a way that does not introduce large modifications to the known successes of the standard model.  

Mirage mediation is one example of a SUSY breaking communication scheme, and in the literature, there was a proposed limit of mirage mediation that (if it existed) would have minimized the tension with the standard model.  We showed, however, that this proposed limit was difficult to achieve in practice, and in generic mirage mediation models, there is some residual tension.

  * **Prospects for Mirage Mediation**.\\ Aaron Pierce and Jesse Thaler.\\  [[http://www.iop.org/EJ/abstract/1126-6708/2006/09/017|JHEP 0609:017 (2006)]], [[http://arxiv.org/abs/hep-ph/0604192|hep-ph/0604192]].