Un-oriented quiver theories for Majorana neutrons

Andrea Addazi, Massimo Bianchi
2015 Journal of High Energy Physics  
In the context of un-oriented open string theories, we identify quivers whereby a Majorana mass for the neutron is indirectly generated by exotic instantons. We discuss two classes of (Susy) Standard Model like quivers, depending on the embedding of SU(2)_W in the Chan-Paton group. In both cases, the main mechanism involves a vector-like pair mixing through a non-perturbative mass term. We also discuss possible relations between the phenomenology of Neutron-Antineutron oscillations and LHC
more » ... cs in these models. In particular, a vector-like pair of color-triplet scalars or color-triplet fermions could be directly detected at LHC, compatibly with n-n̅ limits. Finally we briefly comment on Pati-Salam extensions of our models.
doi:10.1007/jhep07(2015)144 fatcat:kyfgkxd35rc4baslvy5uzqkrvu