Natural explanation for 130 GeV photon line within vector boson dark matter model

TL;DR

This paper proposes a vector boson dark matter model that explains the 130 GeV photon line, predicts a double photon line spectrum, and suggests multiple experimental avenues for testing the model.

Contribution

It introduces a vector boson dark matter model with specific couplings that account for the photon line and predicts observable signals at the LHC and in direct detection.

Findings

Model explains 130 GeV photon line

Predicts double photon line spectrum

Proposes testability at LHC and direct detection

Abstract

We present a dark matter model for explaining the observed 130 GeV photon line from the galaxy center. The dark matter candidate is a vector boson of mass $m_V$ with a dimensionless coupling to the photon and $Z$ boson. The model predicts a double line photon spectrum at energies equal to $m_V$ and $m_V(1-m_Z^2/4m_V^2)$ originating from the dark matter annihilation. The same coupling leads to a mono-photon plus missing energy signal at the LHC. The entire perturbative parameter space can be probed by the 14 TeV LHC run. The model has also a good prospect of being probed by direct dark matter searches as well as the measurement of the rates of $h \to \gamma \gamma$ and $h \to Z \gamma$ at the LHC.