Heidelberg 2022 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

T: Fachverband Teilchenphysik

T 37: Search for New Particles 2

T 37.1: Vortrag

Dienstag, 22. März 2022, 16:15–16:30, T-H22

Search for heavy neutral leptons in decays of W bosons using a dilepton displaced vertex in √s=13 TeV pp collisions with the ATLAS detector. — •Christian Appelt and Heiko Lacker — Humboldt University, Berlin, Germany

We present the ATLAS search for displaced heavy neutral leptons (N) using the full integrated LHC-Run 2 luminosity of 139/fb. Adding right-handed Majorana neutrinos, so-called heavy neutral leptons, to the SM Lagrangian can help explain observed phenomena such as neutrino oscillations, matter-antimatter asymmetry, and dark matter. For the first time, we test not only the single-flavor mixing scenario but also multi-flavor mixing scenarios motivated by neutrino flavor oscillation results for normal and inverted neutrino mass hierarchies. The signature involves N production in W-boson decays, W → N µ or W → N e, and its decay into two charged leptons and a neutrino forming a displaced vertex. We interpret the search results in the N coupling versus mass plane.