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Pseudo Nambu-Goldstone bosons (pNGBs) are attractive dark matter (DM)candidates, since they couple to the Standard Model (SM) predominantly throughderivative interactions. Thereby they naturally evade the strong existinglimits inferred from DM direct detection experiments. Working in an effectivefield theory that includes both derivative and non-derivative DM-SM operators,we perform a detailed phenomenological study of the Large Hadron Collider reachfor pNGB DM production in association with top quarks. Drawing on motivatedbenchmark scenarios as examples, we compare our results to other colliderlimits as well as the constraints imposed by DM (in)direct detectionexperiments and the relic abundance. We furthermore explore implications on theviable parameter space of pNGB DM. In particular, we demonstrate that DM directdetection experiments become sensitive to many pNGB DM realisations onceloop-induced interactions are taken into account. The search strategies andpNGB DM benchmark models that we discuss can serve as a starting point fordedicated experimental analyses by the ATLAS and the CMS collaborations.

Searching for pseudo Nambu-Goldstone boson dark matter production in association with top quarks