LHC constraints on dark matter with (130 GeV) gamma ray lines

TL;DR

This paper examines how LHC collider data constrains dark matter models that could produce 130 GeV gamma-ray lines, focusing on collider signals related to charged particles involved in dark matter annihilation.

Contribution

It provides a comprehensive analysis of LHC constraints on models explaining the 130 GeV gamma-ray line via dark matter interactions with charged particles.

Findings

LHC data limits on models with charged particles coupling to dark matter.

Constraints on collider signatures like dileptons and four-photon events.

Implications for the viability of dark matter explanations of gamma-ray lines.

Abstract

Dark matter annihilation into photons in our galaxy would constitute an exciting indirect signal of its existence, as underscored by tentative evidence for 130 GeV dark matter in Fermi/LAT data. Models that give a large annihilation cross section into photons typically require the dark matter to couple to, or be composed of, new charged particles, that can be produced in colliders. We consider the LHC constraints on some representative models of these types, including the signals of same-sign dileptons, opposite-sign dileptons, events mimicking the production and decay of excited leptons, four-photon events, resonant production of composite vectors decaying into two photons, and monophoton events.