Abstract
We reemphasise the usefulness of angular correlations in LHC searches for missing transverse energy (E missT ) signatures that involve jet (j) pairs with large invariant mass. For the case of mono-jet production via gluon-fusion, we develop a realistic analysis strategy that allows to split the dark matter (DM) signal into distinct one jet-like and two jet-like event samples. By performing state-of-the-art Monte Carlo simulations of both the mono-jet signature and the standard model background, it is shown that the dijet azimuthal angle difference \( \Delta {\phi}_{j_1{j}_2} \) in 2j + E missT production provides a powerful discriminant in realistic searches. Employing a shape fit to \( \Delta {\phi}_{j_1{j}_2} \), we then determine the LHC reach of the mono-jet channel in the context of spin-0 s-channel DM simplified models. The constraints obtained by the proposed \( \Delta {\phi}_{j_1{j}_2} \) shape fit turn out to be significantly more stringent than those that derive from standard E missT shape analyses.
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Haisch, U., Polesello, G. Searching for dark matter in final states with two jets and missing transverse energy. J. High Energ. Phys. 2019, 128 (2019). https://doi.org/10.1007/JHEP02(2019)128
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DOI: https://doi.org/10.1007/JHEP02(2019)128