Mixed Dark Matter in Left-Right Symmetric Models

TL;DR

This paper investigates mixed dark matter candidates within left-right symmetric models, calculating relic abundance and detection prospects, and discusses how collider signals could probe these models, especially in light of recent experimental excesses.

Contribution

It provides the first detailed analysis of dark matter relic abundance and direct detection signals in left-right symmetric models with mixed dark matter candidates.

Findings

Future direct detection experiments will cover large parameter space for TeV-scale dark matter.

Heavy W' boson decays can influence the gauge coupling, affecting model viability.

Collider searches can potentially probe the parameter space related to dark matter and gauge couplings.

Abstract

Motivated by the recently reported diboson and dijet excesses in Run 1 data at ATLAS and CMS, we explore models of mixed dark matter in left-right symmetric theories. In this study, we calculate the relic abundance and the elastic scattering cross section with nuclei for a number of dark matter candidates that appear within the fermionic multiplets of left-right symmetric models. In contrast to the case of pure multiplets, WIMP-nucleon scattering proceeds at tree-level, and hence the projected reach of future direct detection experiments such as LUX-ZEPLIN and XENON1T will cover large regions of parameter space for TeV-scale thermal dark matter. Decays of the heavy charged W' boson to particles in the dark sector can potentially shift the right-handed gauge coupling to larger values when fixed to the rate of the Run 1 excesses, moving towards the theoretically attractive scenario, gR = gL. This region of parameter space may be probed by future collider searches for new Higgs bosons or electroweak fermions.