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T: Fachverband Teilchenphysik

T 49: BSM Suchen IV (Dunkle Materie und LED)

T 49.5: Talk

Tuesday, March 1, 2016, 17:45–18:00, VMP5 SR 0077

Search for Dark Matter produced in association with a top quark pair — Johannes Haller, Roman Kogler, and •Mareike Meyer — Institut für Experimentalphysik, Universität Hamburg

Direct searches for Dark Matter (DM) particles are mainly scattering experiments of DM on nuclei. No evidence for DM has been found. However, these experiments only probe interactions between light quarks and DM, while the interactions between heavy quarks and DM could still be favored.

In this talk, a search for DM produced in association with a top quark pair is presented. Data collected at a center-of-mass energy of 13 TeV by the CMS experiment is analyzed. The search is performed in the lepton + jets channel with large missing transverse energy caused by the DM particles leaving the experiment undetected. The produced DM particles can have high tranverse momenta resulting in a large Lorentz boost for the recoiling top quarks and large cone jets of their decay products. Therefore, the reconstruction of non-isolated leptons and the application of top-tagging techniques are important for this analysis.