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T: Fachverband Teilchenphysik
T 71: Supersymmetry: Theory and searches
T 71.8: Vortrag
Donnerstag, 2. April 2020, 18:15–18:30, H-HS VI
Search for disappearing tracks with the CMS experiment at √s=13 TeV — •Viktor Kutzner1, Samuel Bein1, Seh Wok Lee3, Isabell Melzer-Pellmann2, Sang-Il Pak3, Peter Schleper1, Sezen Sekmen3, Akshansh Singh2, and Alexandra Tews1 — 1Institut für Experimentalphysik, Universität Hamburg — 2DESY — 3Kyungpook National University
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. 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 disappearing track. 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 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.