Dipole Moment Dark Matter at the LHC

TL;DR

This paper derives analytic cross sections for dipole moment dark matter production at the LHC and uses collider data to set constraints, revealing significantly weaker bounds compared to traditional methods.

Contribution

It provides the first analytic expressions for DMDM production cross sections and applies collider data to constrain dipole moment dark matter models.

Findings

7 TeV LHC bounds on MDM DM-proton scattering are much weaker than spin-independent bounds.

Derived explicit formulas for monojet and monophoton processes involving DMDM.

Constraints on DMDM interactions from collider data.

Abstract

Monojet and monophoton final states with large missing transverse energy (${\not E}_T$) are important for dark matter (DM) searches at colliders. We present analytic expressions for the differential cross sections for the parton-level processes, $q\bar{q}(qg)\to g(q)\chi\bar{\chi}$ and $q\bar{q}\to \gamma\chi\bar{\chi}$, for a neutral DM particle with a magnetic dipole moment (MDM) or an electric dipole moment (EDM). We collectively call such DM candidates dipole moment dark matter (DMDM). We also provide monojet cross sections for scalar, vector and axial-vector interactions. We then use ATLAS/CMS monojet${+\not E}_T$ data and CMS monophoton$+{\not E}_T$ data to constrain DMDM. We find that 7 TeV LHC bounds on the MDM DM-proton scattering cross section are about six orders of magnitude weaker than on the conventional spin-independent cross section.