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Supersymmetric Electroweak Baryogenesis Beyond the MSSM in the LHC Era

December 13, 2012 11:00AM to 12:00PM
Presenter 
Jonathan Kozaczuk, University of California, Santa Cruz
Location 
Building 362, Room E188
Type 
Seminar
Series 
Abstract:
Models of electroweak baryogenesis stand out among the possible explanations of the baryon asymmetry of the universe in that they can be effectively probed by current experiments, such as those at the LHC, dark matter searches, and electric dipole moment (EDM) measurements. In this talk, I discuss recent progress made in understanding the mechanism of supersymmetric electroweak baryogenesis beyond the MSSM. Electroweak baryogenesis is highly constrained in the MSSM due to the apparent absence of a light stop, the non-observation of electric dipole moments, and dark matter search results.

However, non-minimal scenarios are still alive and well. For example, an MSSM-like spectrum embedded in a Randall-Sundrum space-time can accommodate a strongly first order electroweak phase transition provided by the dynamics of the radion without light stops. In this case, CP-violating sources in the higgsino-gaugino sector can give rise to the observed baryon asymmetry and still be in agreement with constraints from dark matter and electric dipole moment searches. In the NMSSM there is more freedom: it is possible to obtain a 125 GeV Higgs, a viable dark matter candidate with a 130 GeV line from the galactic center (as observed by Fermi), and successful electroweak baryogenesis while satisfying all other relevant phenomenological constraints. These possibilities are enticing and will largely be probed by increased sensitivity in current experiments.