Scotogenic dark matter and Dirac neutrinos from unbroken gauged B − L symmetry

We propose a simple extension of the standard model where neutrinos get naturally small “scotogenic” Dirac masses from an unbroken gauged B−L symmetry, ensuring dark matter stability. The associated gauge boson gets mass through the Stueckelberg mechanism. Two scenarios are identified, and the resulting phenomenology briefly sketched.Work supported by the Spanish grants SEV-2014-0398 and FPA2017-85216-P (AEI/FEDER, UE), PROMETEO/2018/165 (Gen-eralitat Valenciana) and the Spanish Red Consolider MultiDark FPA2017-90566-REDC. J. L. acknowledges financial support under grant 2019/04195-7, São Paulo Research Foundation (FAPESP). A.M. acknowledges support by CONACYT. CAV-A is supported by the Mexican Cátedras CONACYT project 749 and SNI 5892