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Title: Z -portal right-handed neutrino dark matter in the minimal U ( 1 ) X extended Standard Model

Abstract

We consider a concise dark matter (DM) scenario in the context of a non-exotic U(1) extension of the Standard Model (SM), where a new U(1)X gauge symmetry is introduced along with three generation of right-handed neutrinos (RHNs) and an SM gauge singlet Higgs field. The model is a generalization of the minimal gauged U(1)B-L (baryon number minus lepton number) extension of the SM, in which the extra U(1)X gauge symmetry is expressed as a linear combination of the SM U(1)Y and U(1)B-L gauge symmetries. We introduce a Z2-parity and assign an odd-parity only for one RHN among all particles, so that this Z2-odd RHN plays a role of DM. The so-called minimal seesaw mechanism is implemented in this model with only two Z2-even RHNs. In this context, we investigate physics of the RHN DM, focusing on the case that this DM particle communicates with the SM particles through the U(1)X gauge boson (Z' boson). This "Z'-portal RHN DM" scenario is controlled by only three free parameters: the U(1)X gauge coupling (αX), the Z' boson mass (mZ'), and the U(1)X charge of the SM Higgs doublet (xH). We consider various phenomenological constraints to identify a phenomenologically viable parameter space. The mostmore » important constraints are the observed DM relic abundance and the latest LHC Run-2 results on the search for a narrow resonance with the dilepton final state. In conclusion, we find that these are complementary with each other and narrow the allowed parameter region, leading to the lower mass bound of mZ' ≳ 2.7 TeV.« less

Authors:
 [1];  [2]
  1. Univ. of Alabama, Tuscaloosa, AL (United States). Dept. of Physics and Astronomy
  2. Yamagata Univ. (Japan). Graduate School of Science and Engineering
Publication Date:
Research Org.:
Univ. of Alabama, Tuscaloosa, AL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1365634
Alternate Identifier(s):
OSTI ID: 1344601
Grant/Contract Number:  
SC0013680
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 95; Journal Issue: 3; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Okada, Nobuchika, and Okada, Satomi. Z -portal right-handed neutrino dark matter in the minimal U(1)X extended Standard Model. United States: N. p., 2017. Web. doi:10.1103/PhysRevD.95.035025.
Okada, Nobuchika, & Okada, Satomi. Z -portal right-handed neutrino dark matter in the minimal U(1)X extended Standard Model. United States. https://doi.org/10.1103/PhysRevD.95.035025
Okada, Nobuchika, and Okada, Satomi. Tue . "Z -portal right-handed neutrino dark matter in the minimal U(1)X extended Standard Model". United States. https://doi.org/10.1103/PhysRevD.95.035025. https://www.osti.gov/servlets/purl/1365634.
@article{osti_1365634,
title = {Z -portal right-handed neutrino dark matter in the minimal U(1)X extended Standard Model},
author = {Okada, Nobuchika and Okada, Satomi},
abstractNote = {We consider a concise dark matter (DM) scenario in the context of a non-exotic U(1) extension of the Standard Model (SM), where a new U(1)X gauge symmetry is introduced along with three generation of right-handed neutrinos (RHNs) and an SM gauge singlet Higgs field. The model is a generalization of the minimal gauged U(1)B-L (baryon number minus lepton number) extension of the SM, in which the extra U(1)X gauge symmetry is expressed as a linear combination of the SM U(1)Y and U(1)B-L gauge symmetries. We introduce a Z2-parity and assign an odd-parity only for one RHN among all particles, so that this Z2-odd RHN plays a role of DM. The so-called minimal seesaw mechanism is implemented in this model with only two Z2-even RHNs. In this context, we investigate physics of the RHN DM, focusing on the case that this DM particle communicates with the SM particles through the U(1)X gauge boson (Z' boson). This "Z'-portal RHN DM" scenario is controlled by only three free parameters: the U(1)X gauge coupling (αX), the Z' boson mass (mZ'), and the U(1)X charge of the SM Higgs doublet (xH). We consider various phenomenological constraints to identify a phenomenologically viable parameter space. The most important constraints are the observed DM relic abundance and the latest LHC Run-2 results on the search for a narrow resonance with the dilepton final state. In conclusion, we find that these are complementary with each other and narrow the allowed parameter region, leading to the lower mass bound of mZ' ≳ 2.7 TeV.},
doi = {10.1103/PhysRevD.95.035025},
journal = {Physical Review D},
number = 3,
volume = 95,
place = {United States},
year = {2017},
month = {2}
}

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