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 $BL$ 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 $U(1)$ $BL$ 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, nontrivial, charges under the $U(1)$ $BL$. 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 $U(1)$ $BL$ symmetry. Given the large charges required for anomaly cancellation in the dark sector, the $BL$ $Z'$ 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.
 Authors:

^{[1]};
^{[2]}
;
^{[2]}
;
^{[3]};
^{[4]}
 C.S.I.C./Univ. de Valencia, Paterna (Spain)
 Univ. Autonoma de Madrid, Madrid (Spain); Instituto de Fisica Teorica UAM/CSIC, Madrid (Spain)
 Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
 RuprechtKarlsUniv. Heidelberg, Heidelberg (Germany)
 Publication Date:
 Report Number(s):
 FERMILABPUB17285T; FTUAM1714; IFTUAMCSIC17070; arXiv:1707.08606
Journal ID: ISSN 10298479; 1613331
 Grant/Contract Number:
 AC0207CH11359
 Type:
 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 10298479
 Publisher:
 Springer Berlin
 Research Org:
 Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
 Sponsoring Org:
 USDOE Office of Science (SC), High Energy Physics (HEP) (SC25)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Beyond Standard Model; Neutrino Physics
 OSTI Identifier:
 1376076
De Romeri, Valentina, FernandezMartinez, Enrique, Gehrlein, Julia, Machado, Pedro A. N., and Niro, Viviana. Dark Matter and the elusive Z' in a dynamical Inverse Seesaw scenario. United States: N. p.,
Web. doi:10.1007/JHEP10(2017)169.
De Romeri, Valentina, FernandezMartinez, Enrique, Gehrlein, Julia, Machado, Pedro A. N., & Niro, Viviana. Dark Matter and the elusive Z' in a dynamical Inverse Seesaw scenario. United States. doi:10.1007/JHEP10(2017)169.
De Romeri, Valentina, FernandezMartinez, Enrique, Gehrlein, Julia, Machado, Pedro A. N., and Niro, Viviana. 2017.
"Dark Matter and the elusive Z' in a dynamical Inverse Seesaw scenario". United States.
doi:10.1007/JHEP10(2017)169. https://www.osti.gov/servlets/purl/1376076.
@article{osti_1376076,
title = {Dark Matter and the elusive Z' in a dynamical Inverse Seesaw scenario},
author = {De Romeri, Valentina and FernandezMartinez, Enrique and Gehrlein, Julia and Machado, Pedro A. N. and Niro, Viviana},
abstractNote = {The Inverse Seesaw naturally explains the smallness of neutrino masses via an approximate $BL$ 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 $U(1)$ $BL$ 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, nontrivial, charges under the $U(1)$ $BL$. 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 $U(1)$ $BL$ symmetry. Given the large charges required for anomaly cancellation in the dark sector, the $BL$ $Z'$ 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.},
doi = {10.1007/JHEP10(2017)169},
journal = {Journal of High Energy Physics (Online)},
number = 10,
volume = 2017,
place = {United States},
year = {2017},
month = {10}
}