skip to main content


Title: Dark Matter and the elusive Z' in a dynamical Inverse Seesaw scenario

The Inverse Seesaw naturally explains the smallness of neutrino masses via an approximate $B-L$ symmetry broken only by a correspondingly small parameter. In this work the possible dynamical generation of the Inverse Seesaw neutrino mass mechanism from the spontaneous breaking of a gauged $U(1)$ $B-L$ symmetry is investigated. Interestingly, the Inverse Seesaw pattern requires a chiral content such that anomaly cancellation predicts the existence of extra fermions belonging to a dark sector with large, non-trivial, charges under the $U(1)$ $B-L$. We investigate the phenomenology associated to these new states and find that one of them is a viable dark matter candidate with mass around the TeV scale, whose interaction with the Standard Model is mediated by the $Z'$ boson associated to the gauged $U(1)$ $B-L$ symmetry. Given the large charges required for anomaly cancellation in the dark sector, the $B-L$ $Z'$ interacts preferentially with this dark sector rather than with the Standard Model. This suppresses the rate at direct detection searches and thus alleviates the constraints on $Z'$-mediated dark matter relic abundance. Furthermore, the collider phenomenology of this elusive $Z'$ is also discussed.
 [1] ; ORCiD logo [2] ; ORCiD logo [2] ;  [3] ; ORCiD logo [4]
  1. C.S.I.C./Univ. de Valencia, Paterna (Spain)
  2. Univ. Autonoma de Madrid, Madrid (Spain); Instituto de Fisica Teorica UAM/CSIC, Madrid (Spain)
  3. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  4. Ruprecht-Karls-Univ. Heidelberg, Heidelberg (Germany)
Publication Date:
Report Number(s):
FERMILAB-PUB-17-285-T; FTUAM-17-14; IFT-UAM-CSIC-17-070; arXiv:1707.08606
Journal ID: ISSN 1029-8479; 1613331
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2017; Journal Issue: 10; Journal ID: ISSN 1029-8479
Springer Berlin
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Beyond Standard Model; Neutrino Physics
OSTI Identifier: