Determining the structure of dark-matter couplings at the LHC

Abstract

The latest LHC mono-jet searches place stringent bounds on the pp -> chibar chi cross section of dark matter. Further properties such as the dark matter mass or the precise structure of the interactions between dark matter and the standard model can however not be determined in this manner. We point out that measurements of the azimuthal angle correlations between the two jets in 2 j + chibar chi events may be used to disentangle whether dark matter pair production proceeds dominantly through tree or loop diagrams. Our general observation is illustrated by considering theories in which dark matter interacts predominantly with the top quark. We show explicitly that in this case the jet-jet azimuthal angle difference is a gold-plated observable to probe the Lorentz structure of the couplings of dark matter to top quarks, thus testing the CP nature of the particle mediating these interactions.

8 pages, 5 figures; v2: discussion of signal and background cross sections added, labelling of plots improved, typos fixed and references updated; matches version published in PRD

References in corpus (6)

• PYTHIA 6.4 Physics and Manual
• Parton distributions for the LHC
• Constraints on CP-violating Higgs couplings to the third generation
• Next-to-Leading order Higgs + 2 jet production via gluon fusion
• Next-to-Leading Order Predictions for Dark Matter Production at Hadron Colliders
• Monte Carlo studies of the jet activity in Higgs + 2 jet events

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