Majorana fermion dark matter in minimally extended left-right symmetric model

• Published in: The journal of high energy physics Vol. 2021; no. 9; pp. 1 - 20
• Main Authors: Neves, M. J., Okada, Nobuchika, Okada, Satomi
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-09-2021; Springer Nature B.V; Springer Nature; SpringerOpen
• Subjects: Beyond Standard Model; Broken symmetry; Classical and Quantum Gravitation; CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Cosmology of Theories beyond the SM; Couplings; Dark matter; Eigenvectors; Elementary Particles; Fermions; GUT; High energy physics; Luminosity; Mathematical models; Parameter identification; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Regular Article - Theoretical Physics; Relativity Theory; String Theory; Symmetry; Beyond Standard Model; GUT; Cosmology of Theories beyond the SM
• ISSN: 1029-8479; 1029-8479
• DOI: 10.1007/JHEP09(2021)038

A
bstract
We present a minimal extension of the left-right symmetric model based on the gauge group SU(3)
c
×
SU(2)
L
×
SU(2)
R
×
U(1)
B−L
×
U(1)
X
, in which a vector-like fermion pair (
ζ
L
and
ζ
R
) charged under the U(1)
B−L
×
U(1)
X
symmetry is introduced. Associated with the symmetry breaking of the gauge group SU(2)
R
×
U(1)
B−L
×
U(1)
X
down to the Standard Model (SM) hypercharge U(1)
Y
, Majorana masses for
ζ
L,R
are generated and the lightest mass eigenstate plays a role of the dark matter (DM) in our universe by its communication with the SM particles through a new neutral gauge boson “
X
”. We consider various phenomenological constraints of this DM scenario, such as the observed DM relic density, the LHC Run-2 constraints from the search for a narrow resonance, and the perturbativity of the gauge couplings below the Planck scale. Combining all constraints, we identify the allowed parameter region which turns out to be very narrow. A significant portion of the currently allowed parameter region will be tested by the High-Luminosity LHC experiments.