Are both types of Majorana masses LLM=−mL2[¯(ψL)cψL+¯ψL(ψL)c]
and
LRM=−mR2[¯(ψR)cψR+¯ψR(ψR)c]
SU(2)×U(1) invariant? If not, then both the masses must arise by
SU(2)×U(1) symmetry breaking and both the mass scales are fixed by
electroweak symmetry breaking scale. Right? Then why does one take
mR>>mL in see-saw mechanism? Why should we assume
mR is around the GUT scale?
This post imported from StackExchange Physics at 2014-04-13 14:45 (UCT), posted by SE-user Roopam