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

## Abstract

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.

- Authors:

- 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)
- Ruprecht-Karls-Univ. Heidelberg, Heidelberg (Germany)

- Publication Date:

- Research Org.:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

- OSTI Identifier:
- 1376076

- 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:
- AC02-07CH11359

- Resource Type:
- Journal Article: 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

- Publisher:
- Springer Berlin

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Beyond Standard Model; Neutrino Physics

### Citation Formats

```
De Romeri, Valentina, Fernandez-Martinez, 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., 2017.
Web. doi:10.1007/JHEP10(2017)169.

```
De Romeri, Valentina, Fernandez-Martinez, 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, Fernandez-Martinez, Enrique, Gehrlein, Julia, Machado, Pedro A. N., and Niro, Viviana. Tue .
"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 Fernandez-Martinez, 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 $B-L$ 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.},

doi = {10.1007/JHEP10(2017)169},

journal = {Journal of High Energy Physics (Online)},

number = 10,

volume = 2017,

place = {United States},

year = {Tue Oct 24 00:00:00 EDT 2017},

month = {Tue Oct 24 00:00:00 EDT 2017}

}

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