Constraining Elko Dark Matter at the LHC with Monophoton Events

TL;DR

This paper investigates how LHC monophoton event data constrains Elko dark matter particles, showing that electromagnetic interactions of Elkos up to 1 TeV are excluded at 95% confidence level.

Contribution

It provides the first detailed analysis of LHC constraints on Elko dark matter with electromagnetic interactions, considering unitarity and relic abundance.

Findings

Elko particles with electromagnetic interactions are excluded up to 1 TeV.

LHC 8 TeV data constrains Elko dark matter models.

Electromagnetic Elko interactions cannot account for relic abundance at high masses.

Abstract

A mass dimension one fermion, also known as Elko, constitutes a dark matter candidate which might interact with photons at the tree level in a specific fashion. In this work, we investigate the constraints imposed by unitarity and LHC data on this type of interactions using the search for new physics in monophoton events. We found that Elkos which can explain the dark matter relic abundance mainly through electromagnetic interactions are excluded at the 95\%CL by the 8 TeV LHC data for masses up to 1 TeV.