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T: Fachverband Teilchenphysik

T 95: Searches for Dark Matter III

T 95.8: Vortrag

Donnerstag, 18. März 2021, 17:45–18:00, Tt

Towards a combination of searches for dark matter produced in association with a single top quark or a top quark pair in pp collisions at √s = 13 TeV with the ATLAS detector — •Marianna Liberatore — Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, Germany

Astrophysical observations have provided compelling evidence for the existence of a non-baryonic component of the universe known as Dark Matter (DM). The nature of DM is not well established, but it is often considered to be a Weakly Interacting Massive Particle, characterised by weak-scale interactions with the Standard Model (SM) particles.

A motivation to DM searches at the Large Hadron Collider, and in particular in the ATLAS experiment, is the especially promising possibility that interactions between ordinary matter and DM are mediated by new spin-0 particles that 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. Preliminary work aimed at a statistical combination of these two results in more realistic simplified models will be presented in this talk.

[1] ATLAS-CONF-2020-046

[2] arXiv:2011.09308