parameters. Closer observation reveals that only one eigenstate is massless. This constrains the neutrino masses to be either in the normal hierarchy (NH): $$m_1 = 0 < m_2 \sim 8.7 \text{ meV} < m_3 \sim 50 \text{ meV}$$ or in the inverted hierarchy (IH): $$m_1 \sim  m_2 \sim 50 \text{ meV} > m_3 = 0$$ where only the squared mass differences are measured in neutrino oscillation experiments.

The relevant seesaw contributions from $A, B$ and $C$ are also informative. For example, the term proportional to $A$ in Eq. (\[nu.mass.1\]) is a contribution associated with the VEVs of the left-handed sneutrinos. It arises from neutrino-gaugino mixing such as in Eq. (\[L.n\]). The gauginos are naturally Majorana due to their soft masses and, therefore, integrating them out directly leads to Majorana mass terms for the neutrinos. One can therefore conclude that $$\label{eq:AX}
    A\sim \frac{1}{m_\text{soft}},$$ where $m_\text{soft}$ is some combination of gaugino and Higgsino masses. This conclusion can be verified with the full analytic expression for $A$ in Appendix \[nu\]. The parameter $C$, on the other hand, arises through neutrino-Higgsino mixing because of the $\epsilon_{i}$ term. Higgsinos are not Majorana particles before electroweak symmetry breaking and only their electroweak mixings with the gauginos 