Natural $Z^{\prime }$ -portal Majorana dark matter in alternative U(1) extended standard model

Journal Article · Thu Aug 22 00:00:00 EDT 2019 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.100.035022· OSTI ID:1558695

Okada, Nobuchika; Okada, Satomi; Raut, Digesh

We consider a nonexotic gauged U(1)_X extension of the Standard Model (SM), where the U(1)_X charge of a SM field is given by a linear combination of its hypercharge and baryon-minus-lepton (B–L) number. All the gauge and mixed gauge-gravitational anomalies are canceled in this model with the introduction of three right-handed neutrinos (RHNs). Unlike the conventional minimal U(1)_X model, where a universal U(1)_X charge of –1 is assigned to three RHNs, we consider an alternative charge assignment, namely, two RHNs ($$N$$$^{1,2}_{R}$$) have U(1)_X charge –4 while one RHN (N_R) has a +5 charge. With a minimal extension of the Higgs sector, the three RHNs acquire their Majorana masses associated with U(1)_X symmetry breaking. While $$N$$$^{1,2}_{R}$$ have Yukawa coupling with the SM lepton doublets and play an essential role for the “minimal seesaw” mechanism, NR is isolated from the SM particles due to its U(1)_X charge and hence it is a natural candidate for the dark matter (DM) without invoking additional symmetries. In this model context, we investigate the Z'-portal RHN DM scenario, where the RHN DM communicates with the SM particles through the U(1)_X gauge boson (Z' boson). We identify a narrow parameter space by combining the constraints from the observed DM relic abundance, the results of the search for a Z' boson resonance at the Large Hadron Collider Run-2, and the gauge coupling perturbativity up to the Planck/grand unification scale. A special choice of U(1)_X charges for the SM fields allows us to extend the model to SU(5) × U(1)_X grand unification. In this scenario, the model parameter space is more severely constrained, which will be explored at future high energy collider experiments.

• Research Organization: Univ. of Delaware, Newark, DE (United States); Univ. of Alabama, Tuscaloosa, AL (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• Grant/Contract Number: SC0012447; SC-0013880; SC0013880
• OSTI ID: 1558695
• Alternate ID(s): OSTI ID: 1612043
• Journal Information: Physical Review D, Journal Name: Physical Review D Vol. 100 Journal Issue: 3; ISSN 2470-0010
• Publisher: American Physical Society
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
Astronomy & Astrophysics
Physics
Extensions of fermion sector
Extensions of gauge sector
Grand unified models
Particle dark matter
Vacuum stability