Dortmund 2021 – scientific programme
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T: Fachverband Teilchenphysik
T 36: Search for Supersymmetry II
T 36.1: Talk
Tuesday, March 16, 2021, 16:00–16:15, Tk
Search for disappearing tracks with the CMS experiment at √s=13 TeV — •Viktor Kutzner1, Samuel Bein1, Seh Wok Lee2, Sang-Il Pak2, Peter Schleper1, Sezen Sekmen2, and Alexandra Tews1 — 1Institute for Experimental Physics, Hamburg University, Luruper Chaussee 149, D-22761 Hamburg, Germany — 2Kyungpook National University, Daegu, South Korea
Long-lived particles are often predicted in theories with a small mass splitting between the two lightest particles, for example a chargino and a neutralino in supersymmetry. Given a sufficiently small mass splitting in the range of mπ Δ m 200 MeV, the chargino is expected to decay in the CMS tracker volume into soft non-reconstructed leptons or hadrons and a lightest supersymmetric particle, leaving a short track that then seems to disappear. This signature is characterized by missing hits in the outer layers of the tracker with little or no energy deposited in the calorimeter. In addition to events with one or more disappearings tracks, events with an additional lepton are considered as well to account for a second very long-lived chargino, which decays outside the tracker volume. For both topologies events with additional b-quark jets are investigated to account for gluino-/squark-associated chargino production. Data-driven methods are used to determine the dominant backgrounds arising from prompt leptons and fake tracks. Results are presented using proton-proton collision data with √s=13 TeV collected with the CMS experiment during Run-2.