Dipole moment dark matter at the LHC

Monojet and monophoton final states with large missing transverse energy (E̸T) are important for dark matter (DM) searches at colliders. We present analytic expressions for the differential cross sections for the parton-level processes, qq¯(qg)→g(q)χχ¯ and qq¯→γχχ¯, 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+E̸T data and CMS monophoton+E̸T 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.