Abstract
We present a detailed study of dark matter phenomenology in low-scale left-right symmetric models. Stability of new fermion or scalar multiplets is ensured by an accidental matter parity that survives the spontaneous symmetry breaking of the gauge group by scalar triplets. The relic abundance of these particles is set by gauge interactions and gives rise to dark matter candidates with masses above the electroweak scale. Dark matter annihilations are thus modified by the Sommerfeld effect, not only in the early Universe, but also today, for instance, in the Center of the Galaxy. Majorana candidates—triplet, quintuplet, bi-doublet, and bi-triplet—bring only one new parameter to the model, their mass, and are hence highly testable at colliders and through astrophysical observations. Scalar candidates—doublet and 7-plet, the latter being only stable at the renormalizable level—have additional scalar-scalar interactions that give rise to rich phenomenology. The particles under discussion share many features with the well-known candidates wino, Higgsino, inert doublet scalar, sneutrino, and Minimal Dark Matter. In particular, they all predict a large gamma-ray flux from dark matter annihilations, which can be searched for with Cherenkov telescopes. We furthermore discuss models with unequal left-right gauge couplings, gR ≠ gL, taking the recent experimental hints for a charged gauge boson with 2 TeV mass as a benchmark point. In this case, the dark matter mass is determined by the observed relic density.
Highlights
The Standard Model (SM) gives a highly satisfactory account of the forces and interactions between known particles
We present a detailed study of dark matter phenomenology in low-scale left-right symmetric models
Left-right symmetric extensions of the Standard Model based on the gauge group SU(2)L × SU(2)R × U(1)B−L are theoretically appealing because they shed light on the maximal parity violation of weak interactions and give rise to seesaw-suppressed neutrino masses
Summary
The Standard Model (SM) gives a highly satisfactory account of the forces and interactions between known particles. While one of the righthanded neutrinos can be tuned to be in the keV mass range relevant for long-lived warm DM, its gauge interactions typically overproduce them and require a non-standard production/dilution mechanism [7, 8]. Assuming this production mechanism to be in place, the (unstable) keV neutrino can give rise to testable signatures [8, 9]. In appendix D we discuss the Sommerfeld effect in the context of indirect detection DM searches and, in appendix E we describe the SU(2)L-symmetric limit for the calculation of the relic density
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