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We propose a new search for Dark Matter at the LHC, characteristic ofscenarios beyond the Standard Model with a pseudoscalar portal between thevisible and dark sectors. This search, leading to a $\bar{b} b Z( \rightarrow\ell\ell) + E_{T} \hspace{-4mm}/\hspace{2mm}$ final state, reaches largeregions of parameter space not probed by Dark Matter searches via multi-jet $+E_{T} \hspace{-4mm}/\hspace{2mm}$, searches for new scalars and flavour bounds.We show that this search could be used to test the Dark Matter origin of thegamma ray Galactic Centre excess with LHC Run 2 data.

physical review. d/physical review. d.

Probing the Pseudoscalar portal to Dark Matter via $\bar{b} b Z(  \rightarrow \ell\ell) + E_{T} \hspace{-8mm}/\hspace{4mm}$: From the LHC to  the Galactic Centre Excess