Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 1: Searches/BSM I (HNL, ETmiss+X)

T 1.2: Vortrag

Montag, 31. März 2025, 17:00–17:15, ZHG010

Search for heavy neutral leptons in decays of W bosons using leptonic and semi-leptonic displaced vertices in center-of-mass energy of 13 TeV p p collisions with the ATLAS detector — •Marzieh Bahmani — Humboldt university, Berlin, Germany

In this talk, I will present a search for long-lived heavy neutral leptons (HNLs), which are produced through the decay of a W-boson into a muon or electron and an HNL. We investigate two distinct decay channels: a leptonic channel, where the HNL decays into two leptons and a neutrino, and a semi-leptonic channel, where the HNL decays into a lepton and a charged pion. This search is based on 140 fb-1 of proton-proton collision data in center-of-mass energy of 13 TeV, collected by the ATLAS detector during Run 2 of the LHC. I will discuss the results within the context of both single-flavor and multi-flavor mixing scenarios and their implications for future searches in this exciting area of particle physics.

Keywords: Heavy Neutral Leptons (HNLs); ATLAS experiment; Long-lived Particles