A pr 2 01 7 Prepared for submission to JHEP On the Seesaw Scale in Supersymmetric SO ( 10 ) Models

The seesaw mechanism, which is responsible for the description of neutrino masses and mixing, requires a scale lower than the unification scale. We propose a new model with spinor superfields playing important roles to generate this seesaw scale, with special attention paid on the Goldstone mode of the U (1) B−L symmetry breaking.