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We reemphasise the usefulness of angular correlations in LHC searches formissing transverse energy ($E_T^{\mathrm{miss}}$) signatures that involve jet$(j)$ pairs with large invariant mass. For the case of mono-jet production viagluon-fusion, we develop a realistic analysis strategy that allows to split thedark matter (DM) signal into distinct one jet-like and two jet-like eventsamples. By performing state-of-the-art Monte Carlo simulations of both themono-jet signature and the standard model background, it is shown that thedijet azimuthal angle difference $\Delta \phi_{j_1 j_2}$ in $2 j+E_T^{\mathrm{miss}}$ production provides a powerful discriminant in realisticsearches. Employing a shape fit to $\Delta \phi_{j_1 j_2}$, we then determinethe LHC reach of the mono-jet channel in the context of spin-0 $s$-channel DMsimplified models. The constraints obtained by the proposed $\Delta \phi_{j_1j_2}$ shape fit turn out to be significantly more stringent than those thatderive from standard $E_T^{\mathrm{miss}}$ shape analyses.

Searching for dark matter in final states with two jets and missing transverse energy