Searching for Dark Matter Signals in the Left-Right Symmetric Gauge Model with CP Symmetry

TL;DR

This paper explores singlet scalar dark matter within a left-right symmetric gauge model with CP symmetry, predicting detection cross sections and analyzing the potential for future experiments to observe such signals.

Contribution

It introduces a novel dark matter candidate in a 2HBDM framework stabilized by P and CP symmetries, with detailed predictions for detection prospects.

Findings

Future direct detection experiments can probe most of the parameter space.

DM indirect detection signals are insensitive to Higgs mixing except near resonances.

PAMELA data only exclude narrow parameter regions.

Abstract

We investigate singlet scalar dark matter (DM) candidate in a left-right symmetric gauge model with two Higgs bidoublets (2HBDM) in which the stabilization of the DM particle is induced by the discrete symmetries P and CP. According to the observed DM abundance, we predict the DM direct and indirect detection cross sections for the DM mass range from 10 GeV to 500 GeV. We show that the DM indirect detection cross section is not sensitive to the light Higgs mixing and Yukawa couplings except the resonance regions. The predicted spin-independent DM-nucleon elastic scattering cross section is found to be significantly dependent on the above two factors. Our results show that the future DM direct search experiments can cover the most parts of the allowed parameter space. The PAMELA antiproton data can only exclude two very narrow regions in the 2HBDM. It is very difficult to detect the DM direct or indirect signals in the resonance regions due to the Breit-Wigner resonance effect.