Discrete R Symmetries for the MSSM and Its Singlet Extensions

By Hyun Min Lee, S. Raby, M. Ratz, G. Ross, Roland Schieren, K. Schmidt-Hoberg, Patrick K. S. Vaudrevange. 2011

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In this book we have studied supersymmetric extensions of the Standard Model, including the MSSM, and supersymmetric orbifold GUTs in 4 and higher dimensions. Although they provide a framework for solving the hierarchy problem, they introduce additional problems associated with the μ term, flavor problems and new effective operators which violate baryon and lepton number, leading to proton decay. We have discussed particular mechanisms which can ameliorate each of these problems. The μ problem can be solved by incorporating a symmetry which forbids the μ term at the tree level, but is broken spontaneously by a SUSY breaking VEV, i.e. the so-called Giudice-Masiero mechanism [117], or by a Peccei-Quinn symmetry breaking VEV which results in a μ term and an invisible QCD axion, the so-called Kim-Nilles mechanism [118]. Minimal flavor violation and/or heavy scalars can protect against large flavor violation. This, of course, depends on the SUSY breaking mechanisms.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/deb0c3e22a8bd902313641c331b5d676b9931624