Heidelberg 2022 – scientific programme

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T: Fachverband Teilchenphysik

T 76: Search for Dark Matter 3

T 76.6: Talk

Wednesday, March 23, 2022, 17:30–17:45, T-H35

Combining Dark Matter searches with top quarks with the ATLAS detector — •Marianna Liberatore — Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, Germany

A motivation to WIMP dark matter (DM) searches at the LHC, and in particular in ATLAS, is the especially promising possibility that interactions between ordinary matter and DM are mediated by new spin-0 particles. Such particles would extend the SM with a potential dark sector, to which DM particles belong. Similarly to the Higgs boson, these new mediators interact strongest with the heaviest particles via Yukawa-type couplings, making them more prone to associated production with heavy-flavour quarks.

To test those models, two recently released search channels are considered within ATLAS: DM with top quark pairs[1] or a single top quark[2], with a focus on the two charged leptons final states. This talk will motivate how the statistical combination of these two results in simplified models could significantly enhance the sensitivity to DM signals, and the first results of these combined studies will be presented.

[1] JHEP04(2021)165

[2] Eur.Phys.J.C(2021)81:860