Title: Flavor of quiver-like models for SUSY breaking

Speaker: Dr. Sven Bjarke Gudnason (Hebrew University)

Time: 3:00pm Apr.10th (Wednesday)

Place: Theory Division，319

Abstract:

Direct experimental searches for supersymmetric particles exclude light first generation squarks and gluinos while meson mixing requires the first and second generation to be almost degenerate. The third generation squarks should be as light as possible in order for supersymmetry to solve the (little) hierarchy problem. These two statements lead one to consider natural (or effective) supersymmetry; a model where the third generation of superpartners have small masses with respect to the first/second generation. Another option is to give up to some extent on the hierarchy problem and use dark matter and gauge coupling unification to pinpoint the model of SUSY breaking (split or mild-split SUSY). A quiver-like model is presented which encompasses both options and is able to make a viable SM fermion flavor texture as well as deal with the supersymmetric flavor problem. In the natural setting gauge coupling unification can only be achieved in a more contrived setup, while the mu/Bmu problem can be solved.