CBC zero modes are Majorana while free nonzero KK modes form Dirac fermions via accidental U(1); an extended seesaw then sources LNV from bulk CBC-chiral interactions rather than the Majorana mass.
Active Dirac Neutrinos via $SU(2)_L$ Doublets in 5d
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abstract
We propose a new mechanism to generate minuscule active neutrino masses in a five-dimensional~(5d) spacetime of an interval without introducing $SU(2)_L$ singlet neutrinos. Under asymmetric boundary conditions on the two end points, a bulk mass for a 5d fermion allows a Dirac particle with a tiny mass eigenvalue. Implementing this mechanism, which provides us a new tool for building neutrino mass models, to the standard model gauge structure is possible when all the gauge bosons and the Higgs boson are localized on one of the branes.
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Conjugate Boundary Conditions, Kaluza-Klein Fermions, and an Extended Seesaw Model
CBC zero modes are Majorana while free nonzero KK modes form Dirac fermions via accidental U(1); an extended seesaw then sources LNV from bulk CBC-chiral interactions rather than the Majorana mass.