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We investigate the signatures at the Large Hadron Collider of a minimal modelwhere the dark matter particle is a Majorana fermion that couples to theStandard Model via one or several coloured mediators. We emphasize theimportance of the production channel of coloured scalars through the exchangeof a dark matter particle in the t-channel, and perform a dedicated analysis ofsearches for jets and missing energy for this model. We find that the colliderconstraints are highly competitive compared to direct detection, and can evenbe considerably stronger over a wide range of parameters. We also discuss thecomplementarity with searches for spectral features at gamma-ray telescopes andcomment on the possibility of several coloured mediators, which is furtherconstrained by flavour observables.

Majorana Dark Matter with a Coloured Mediator: Collider vs Direct and Indirect Searches