The seesaw mechanism in the $\mu \nu$SSM

Understand

The $\mu \nu$SSM proposes to use right-handed neutrino supermultiplets in order to generate the $\mu$ term and neutrino masses simultaneously.

• We discuss neutrino physics and the associated electroweak seesaw mechanism in this model.
• We show how to obtain, from the neutralino-neutrino mass matrix of the $\mu \nu$SSM, the effective neutrino mass matrix.
• In particular we discuss certain limits of this matrix that clarify the neutrino-sector behavior of the model.