The neutrino mass hierarchies are made of two hypotheses/scenarios:
- the normal hierarchy: $m1<m2<m3$
- the inverted hierarchy: $m3<m1<m2$
Why neutrino mass hierarchy scenario do not include also the cases:
$m2<m1<m3$?
$m3<m2<m1$?
I have seen the post: Neutrino mass hierarchy
but two people are in contradiction and there was no conclusion on who is right. @SRS is saying in this thread that it is a convention to have m1<m2$m_1<m_2$. Is he right? wrong? Is there a proof of the convention from a statement in a document?