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A search for dark matter produced in association with a top quark pair ispresented. The search is performed using 19.7 $\mathrm{fb^{-1}}$ ofproton-proton collisions recorded at a center of mass energy of 8 TeV with theCMS detector at the LHC. The signature investigated is top quark pairs in thesemi-leptonic final state plus missing transverse energy. This work focuses inparticular on dark matter production through scalar interaction where aproportionality to the quark mass is expected.

Dark matter produced in association with top quark pair