Light Higgs Boson, Light Dark Matter and Gamma Rays

TL;DR

This paper proposes a model with a light Higgs and dark matter that explains experimental signals and gamma-ray observations, suggesting new particles could be detected at the LHC.

Contribution

It introduces a complex scalar singlet extension to the Standard Model that fits electroweak measurements and links light dark matter to gamma-ray signals.

Findings

Light Higgs improves fit to $M_W$ and $m_t$ measurements.

Light dark matter explains CoGeNT and DAMA/LIBRA signals.

Gamma-ray data from Fermi LAT is better fitted with dark matter annihilations.

Abstract

A light Higgs boson is preferred by $M_W$ and $m_t$ measurements. A complex scalar singlet addition to the Standard Model allows a better fit to these measurements through a new light singlet dominated state. It then predicts a light Dark Matter (DM) particle that can explain the signals of DM scattering from nuclei in the CoGeNT and DAMA/LIBRA experiments. Annihilations of this DM in the galactic halo, $AA\rightarrow b\bar{b}, c\bar{c}, \tau^+\tau^-$, lead to gamma rays that naturally improve a fit to the Fermi Large Area Telescope data in the central galactic regions. The associated light neutral Higgs boson may also be discovered at the Large Hadron Collider.