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Seminaria Oddziału IV
Run-2 Search for Long-Lived Heavy Neutral Leptons in ATLAS and Prospects with a New Displaced Channel
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Europe/Warsaw
Description
I present a search for long-lived heavy neutral leptons (HNLs) produced in decays of W bosons using the full Run-2 pp collision dataset recorded by the ATLAS detector at \sqrt(s) = 13 TeV. The analysis targets leptonic and semi-leptonic displaced vertices and sets constraints on HNL production as a function of mass and lifetime. In addition, I discuss the development of a new displaced semi-leptonic channel for Run-3, focusing on dedicated mass reconstruction techniques for HNL decays involving a lepton and a ρ meson, as well as preliminary results from the implementation of an HNL model in the Sherpa event generator. These developments extend the sensitivity of future ATLAS searches to previously unexplored regions of parameter space.