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Title: Right-handed neutrino dark matter in the classically conformal $$\mathrm{U(1)'}$$ extended standard model

Journal Article · · Physical Review. D.
 [1];  [2];  [1]
  1. Okinawa Institute of Science and Technology Graduate University (OIST), Onna, Okinawa (Japan); Meio Univesity, Nago, Okinawa (Japan)
  2. University of Alabama, Tuscaloosa, AL (United States)

Here we consider the dark matter (DM) scenario in the context of the classically conformal U(1)′ extended standard model (SM), with three right-handed neutrinos (RHNs) and the U(1)′ Higgs field. The model is free from all of the U(1)′ gauge and gravitational anomalies in the presence of the three RHNs. We introduce a Z2 parity in the model, under which an odd parity is assigned to one RHN, while all of the other particles are assigned to be Z2 even, and hence the Z2-odd RHN serves as a DM candidate. In this model, the U(1)′ gauge symmetry is radiatively broken through the Coleman-Weinberg mechanism, by which the electroweak symmetry breaking is triggered. There are three free parameters in our model—the U(1)′ charge of the SM Higgs doublet (xH), the new U(1)′ gauge coupling (gX), and the U(1)′ gauge boson (Z′) mass (mZ′)—which are severely constrained in order to solve the electroweak vacuum instability problem, and satisfy the LHC Run-2 bounds from the search for the Z′ boson resonance. In addition to these constraints, we investigate the RHN DM physics. Because of the nature of classical conformality, we find that a RHN DM pair mainly annihilates into the SM particles through Z′ boson exchange. This is the so-called Z′-portal DM scenario. Combining the electroweak vacuum stability condition, the LHC Run-2 bounds, and the cosmological constraint from the observed DM relic density, we find that all constraints work together to narrow the allowed parameter regions and, in particular, exclude mZ′ ≲ 3.5 TeV. For the obtained allowed regions, we calculate the spin-independent cross section of the RHN DM with nucleons. We find that the resultant cross section is well below the current experimental upper bounds.

Research Organization:
Univ. of Alabama, Tuscaloosa, AL (United States)
Sponsoring Organization:
USDOE Office of Science (SC); Okinawa Institute of Science and Technology
Grant/Contract Number:
SC0013680
OSTI ID:
1541113
Alternate ID(s):
OSTI ID: 1410581
Journal Information:
Physical Review. D., Vol. 96, Issue 9; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 21 works
Citation information provided by
Web of Science

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