Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 43: DAQ and Trigger 2

T 43.4: Vortrag

Dienstag, 22. März 2022, 17:00–17:15, T-H28

Trigger optimization studies in the search for displaced heavy neutral leptons with the ATLAS detector. — •Julius Ehrsam, Heiko Lacker, and Christian Appelt — Humboldt University, Berlin, Germany

Adding heavy neutral leptons (HNLs) with masses below the electroweak scale to the SM Lagrangian can help explain observed Beyond-Standard-Model phenomena such as neutrino oscillations, matter-antimatter asymmetry, and dark matter. We study a new trigger option for the ATLAS experiment designed explicitly for the search for HNLs produced in events pp → W+X, W → ℓ + HNL, with HNL → µ⁺ µ⁻ ν , resulting in a prompt lepton and a displaced vertex due to the expected long HNL lifetime. The proposed trigger uses a muon as the prompt lepton and the angular separation between the two muons from the HNL decay.