Complex Scalar Dark Matter vis-\`{a}-vis CoGeNT, DAMA/LIBRA and XENON100

TL;DR

This paper proposes that a complex scalar singlet extension of the standard model can explain light dark matter signals observed in CoGeNT and DAMA/LIBRA experiments, consistent with XENON100 constraints, and predicts Higgs and DM signatures for LHC detection.

Contribution

It introduces a complex scalar singlet model that accounts for light dark matter signals and aligns with collider constraints, providing testable predictions for Higgs and dark matter discovery at the LHC.

Findings

The model explains CoGeNT and DAMA/LIBRA signals without conflicting with XENON100.

Predicted Higgs mass eigenstates and their decay channels.

Potential signatures of dark matter and Higgs particles at the LHC.

Abstract

The CoGeNT and DAMA/LIBRA experiments have found evidence for the spin-independent scattering from nuclei of a light dark matter (DM) particle, 7-12 GeV, which is not excluded by the XENON DM experiments. We show that this putative DM signal can be explained by a complex scalar singlet extension of the standard model (CSM), with a thermal cosmological DM density, and a Higgs sector that is consistent with LEP constraints. We make predictions for the masses, production, and decays of the two Higgs mass eigenstates and describe how the Higgs and DM particles can be discovered at the LHC.