violating effects will therefore be negligible compared to the $R$-parity conserving effects, except for the LSP, which now decays via RPV.

Since $R$-parity violation simultaneously determines both the neutrino sector and the decays of the LSP, it is possible that some of the information from the neutrino sector will be revealed in the LSP decay. This is an exciting and rare opportunity to relate these two fields.

Neutrino Masses and R-parity Violation {#sec.nu.mass}
======================================

Any model with right-handed neutrinos allows for Dirac neutrino masses through the Yukawa coupling between left- and right-handed neutrinos. In this model, Majorana masses are also possible due to the VEV of the right-handed sneutrino. As mentioned above, only one generation of right-handed sneutrino can attain a significant VEV [@Mohapatra:1986aw; @Ghosh:2010hy; @Barger:2010iv]. This means that lepton number is only significantly violated (TeV-scale violation) in one generation of the right-handed neutrinos. It is only that generation of right-handed neutrinos that will attain a TeV-scale mass. This gives rise to a system of neutrinos with three layers: a TeV scale right-handed Majorana neutrino, the three active neutrinos and two light sterile neutrinos[ Sterile neutrinos are typically sub-MeV fermions without SM quantum numbers. In this model, their masses must 