Electroweak precision measurements in supersymmetric models with a U(1)R lepton number

Understand

As experimental constraints on the parameter space of the MSSM and close variations thereof become stronger, the motivation to explore supersymmetric models that challenge some of the standard assumptions of the MSSM also become stronger.

• For example, models where the gauginos are Dirac instead of Majorana have recently received more attention.
• Beside allowing for a supersoft SUSY breaking mechanism where the gauginos only provide finite threshold corrections to scalar masses, the cross section for the production of a squark pairs is reduced.
• In addition, Dirac gauginos can be used to build models that possess a U(1)R symmetry.