Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 86: Search for New Particles IV

T 86.1: Talk

Thursday, March 18, 2021, 16:00–16:15, Tk

Limit setting in the current search for displaced heavy neutral leptons with the ATLAS detector using the full integrated LHC Run 2 luminosity — •Christian Appelt and Heiko Lacker — Humboldt University, Berlin, Germany

The existence of right-handed neutrinos with Majorana masses below the electroweak energy scale can address ongoing problems of neutrino masses, matter-antimatter asymmetry of the universe, and dark matter. In this talk, we present limit-setting methods, as applied in the current search for heavy neutral leptons using the full LHC Run 2 luminosity of 139 / fb. The heavy neutral leptons are produced in leptonic decays of on-shell W bosons formed in 13 TeV pp collisions at the LHC. We focus on unique displaced signatures captured by the ATLAS detector, characterized by a prompt lepton originating from the W boson decay and a secondary vertex displaced in the radial direction by 4-300 mm from the beamline. The expected limit results are given as exclusion contours in the heavy neutral lepton coupling strength versus mass plane.