${Z}^{}$ portal righthanded neutrino dark matter in the minimal ${\mathrm{U}\left(1\right)}_{X}$ extended Standard Model
Abstract
We consider a concise dark matter (DM) scenario in the context of a nonexotic U(1) extension of the Standard Model (SM), where a new U(1) _{X} gauge symmetry is introduced along with three generation of righthanded neutrinos (RHNs) and an SM gauge singlet Higgs field. The model is a generalization of the minimal gauged U(1) _{BL} (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) _{BL} gauge symmetries. We introduce a Z _{2}parity and assign an oddparity only for one RHN among all particles, so that this Z2odd RHN plays a role of DM. The socalled minimal seesaw mechanism is implemented in this model with only two Z _{2}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 (x _{H}). We consider variousmore »
 Authors:

 Univ. of Alabama, Tuscaloosa, AL (United States). Dept. of Physics and Astronomy
 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) (SC25)
 OSTI Identifier:
 1365634
 Alternate Identifier(s):
 OSTI ID: 1344601
 Grant/Contract Number:
 SC0013680
 Resource Type:
 Journal Article: Accepted Manuscript
 Journal Name:
 Physical Review D
 Additional Journal Information:
 Journal Volume: 95; Journal Issue: 3; Journal ID: ISSN 24700010
 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 righthanded 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 righthanded neutrino dark matter in the minimal U(1)X extended Standard Model. United States. doi:10.1103/PhysRevD.95.035025.
Okada, Nobuchika, and Okada, Satomi. Tue .
"Z portal righthanded neutrino dark matter in the minimal U(1)X extended Standard Model". United States. doi:10.1103/PhysRevD.95.035025. https://www.osti.gov/servlets/purl/1365634.
@article{osti_1365634,
title = {Z portal righthanded 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 nonexotic U(1) extension of the Standard Model (SM), where a new U(1)X gauge symmetry is introduced along with three generation of righthanded neutrinos (RHNs) and an SM gauge singlet Higgs field. The model is a generalization of the minimal gauged U(1)BL (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)BL gauge symmetries. We introduce a Z2parity and assign an oddparity only for one RHN among all particles, so that this Z2odd RHN plays a role of DM. The socalled minimal seesaw mechanism is implemented in this model with only two Z2even 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 Run2 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},
issn = {24700010},
number = 3,
volume = 95,
place = {United States},
year = {2017},
month = {2}
}
Web of Science
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