Bonn 2020 – wissenschaftliches Programm
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T 94.4: Vortrag
Freitag, 3. April 2020, 11:45–12:00, H-HS V
Search for Higgsino production in SUSY scenarios with a compressed mass spectrum. — •Yuval Nissan1, Sam Bein1, Peter Schleper1, and Gudrid Moortgat-Pick2 — 1Institut für Experimentalphysik, Universität Hamburg — 2Institute of Theoretical Physics, Universität Hamburg
A search for leptonic decays of Higgsino-like neutralinos in the case of a compressed mass spectrum using a track, a reconstructed lepton and missing transverse momentum is presented. We consider the case of a second-lightest neutralino decaying into a dark matter candidate - lightest neutralino - and two leptons via an off-shell Z boson. In the case of a very small mass differences between the neutralinos, the leptons produced are very soft, making it very difficult to reconstruct them at CMS. We consider a case where one of the leptons is reconstructed by a track, and the other as a reconstructed lepton of opposite charge. Signals of different mass splitting are probed and interpreted within a set of simplified models. Multivariate discriminants are employed in the event- and object-level selection, and their performance is studied.