A 130 GeV photon line from dark matter annihilation in the NMSSM

TL;DR

This paper demonstrates that the NMSSM can naturally explain a 130 GeV photon line from dark matter annihilation, consistent with relic density, direct detection, and Higgs mass constraints.

Contribution

It shows the parameter space of the NMSSM can simultaneously account for the 130 GeV photon line, relic density, direct detection limits, and Higgs mass.

Findings

Neutralino dark matter of ~130 GeV can produce the photon line.

Annihilation cross section ≥ 10^{-27}cm^3s^{-1} is achievable.

Parameter space requires CP-odd Higgs near 260 GeV.

Abstract

In the Next-to-Minimal Supersymmetric Standard Model, neutralino dark matter can annihilate into a pair of photons through the exchange of a CP-odd Higgs boson in the s-channel. The CP-odd Higgs boson couples to two photons through a loop of dominantly higgsino-like charginos. We show that the parameter space of the NMSSM can accommodate simultaneously i) neutralino-like dark matter of a mass of about 130 GeV giving rise to a 130 GeV photon line; ii) an annihilation cross section of or larger than 10^{-27}cm^3s^{-1}; iii) a relic density in agreement with WMAP constraints; iv) a direct detection cross section compatible with bounds from XENON100, and v) a Standard Model like Higgs mass of about 125 GeV. However, the CP-odd Higgs mass has to lie accidentally close to 260 GeV.