Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 55: Search for new particles III

T 55.5: Talk

Wednesday, April 1, 2020, 17:30–17:45, H-HS XVI

Sensitivity studies for the search for heavy neutral leptons in decays of W bosons produced in 13 TeV pp collisions using displaced signatures with the ATLAS detector — •Christian Appelt and Heiko Lacker for the ATLAS collaboration — 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 work, we present a sensitivity study in the search of heavy neutral leptons (HNLs) in the mass range of 4.5-10 GeV. The HNLs are produced in leptonic decays of on-shell W bosons formed in 13 TeV pp collisions at the Large Hadron Collider. We are focusing on unique displaced signatures captured by the ATLAS detector. The displaced signatures are characterized by a prompt muon originating from the W boson decay and a secondary vertex displaced in the radial direction by 4-300mm from the beam line. The displaced HNL search considers data with an integrated luminosity of up to 139/fb and results are given as exclusion contours in the HNL coupling strength versus mass plane.