Majorana Dark Matter in a new B−L model

Abstract

We present a comprehensive study of Majorana dark matter in a U (1) B−L gauge extension of the standard model, where three exotic fermions with B − L charges as −4, −4, +5 are added to make the model free from the triangle gauge anomalies. The enriched scalar sector and the new heavy gauge boson Z , associated with the U (1) B−L symmetry make the model advantageous to be explored in dual portal scenarios for the search of dark matter signal. Diagonalizing the exotic fermion mass matrix, we obtain the Majorana mass eigenstates, of which the lightest one plays the role of dark matter. Analyzing the effect of two mediators separately, the scalar portal channels give a viable parameter space consistent with relic density from PLANCK data and the direct detection limits from various experiments such as LUX, XENON1T and PandaX. While the Z mediated channels are constrained from relic abundance and LHC searches for Z in the dilepton channel. A massless physical Goldstone boson plays a key role in the scalar portal relic density. Finally, we briefly discuss the neutrino mass generation at one-loop level.

Exploring dark matter, neutrino mass, and RK(*),ϕ anomalies in Singirala1, Sahoo2, Mohanta3 2019Phys. Rev. DSelf Cite

“…1, which are mediated by ðH 1 ; H 2 ; η þ ; η 0 ; S 1 ; Z 0 Þ. Majorana DM in the H 1;2 portal (upper row in Fig. 1) has already been well explored in the literature [60,61]. Here, we focus on ðZ 0 ; S 1 ; ηÞ-mediated channels (middle and bottom rows in Fig.…”

Dark Photon Dark Matter in the minimal $B-L$ Model

“…Since the area of the parameter space (λ, m φ ) causing the dark thermal bath in these ways is confirmed to be smaller than that corresponding to φ ↔ A µ + A µ process, we focus on φ ↔ A µ + A µ process for our discussion of the dark thermal bath formation. 11 GeV FIG. 2.…”

“…(C1) are insensitive to (λ, m φ ), but sensitive solely to m A . 11 Using Eq. (B1), we figure out that m A = O(10)keV gives rise to λ FS = O(10 −3 ) − O(10 −2 )Mpc.…”

Singlet scalar dark matter in U(1)B-L models without right-handed neutrinos

“…We also introduce a scalar dark matter φ DM , singlet under the SM gauge group but charged under U (1) B−L . It doesn't get any VEV, it does flow in the loop to generate light neutrino mass as discussed in Section-V. Fermionic dark matter of the current model has been explored in [36]. The particle content of the present model is given in Table I. The relevant terms in the Lagrangian for fermions in the present model is given by…”